codeforces

Codeforces — 709 solutions

Listed hardest-first. Folders: rounds/ (rated) and icpc-gym/ (ICPC & team).

Problem	Date	Topics	Lines
Shaass the Great	2023-08-19	dp, trees	76
Card Game	2025-03-12	combinatorics, dp, fft, greedy	53
Beautiful Tree	2025-10-19	constructive algorithms, math, probabilities, trees	35
How Many Paths?	2025-02-19	dfs and similar, dp, graphs, trees	133
Longest Array Deconstruction	2025-02-22	data structures, divide and conquer, dp, sortings	131
Ralph and Mushrooms	2022-06-09	dp, graphs	105
Adventurers	2025-02-24	binary search, data structures, greedy, sortings	104
GCD of an Array	2022-01-17	brute force, data structures, hashing, implementation	99
Destroy it!	2025-02-23	dp, implementation, sortings	80
Red-Black Number	2021-10-15	dfs and similar, dp, implementation, math	74
Mishka and Interesting sum	2025-03-13	data structures	59
Three Paths on a Tree	2023-12-26	dfs and similar, dp, greedy, trees	119
XOR on Segment	2025-03-07	bitmasks, data structures	96
1-1-1, Free Tree!	2025-10-23	brute force, data structures, dfs and similar, graphs	90
Orac and Game of Life	2025-02-16	dfs and similar, graphs, implementation, shortest paths	76
Maximum Subarray	2025-02-16	data structures, dp, greedy, two pointers	66
GCD Counting	2025-03-06	data structures, dfs and similar, dp, number theory	62
Messenger Simulator	2025-03-13	data structures	55
Work Group	2024-11-14	dfs and similar, dp, graphs, strings	53
Replace With Product	2023-12-22	brute force, greedy, math	51
TV Shows	2025-02-17	data structures, greedy, implementation, sortings	43
Increasing Frequency	2021-09-14	binary search, dp, greedy	43
Weakness and Poorness	2023-06-03	ternary search	33
Multiset	2022-08-24	binary search, data structures	185
Unlucky Numbers	2023-12-22	brute force, dp, greedy, implementation	80
Strange Definition	2021-12-08	bitmasks, graphs, hashing, math	73
Half of Same	2021-10-13	brute force, math, number theory	66
Robot Queries	2023-12-19	binary search, data structures, dp, implementation	63
Palindromic characteristics	2022-08-16	brute force, dp, hashing, strings	63
Valuable Cards	2025-11-01	brute force, dp, greedy, number theory	63
Noise Level	2023-08-09	dfs and similar, implementation, math	62
Concatenated Multiples	2021-11-17	implementation, math	62
Credit Card	2022-08-19	data structures, dp, greedy, implementation	62
N Problems During K Days	2022-08-24	constructive algorithms, greedy, math	54
Changing Array	2022-08-14	greedy, implementation	51
Yet Another Problem On a Subsequence	2022-01-17	combinatorics, dp	49
Suspicious logarithms	2023-12-20	binary search, brute force, math	39
Not Adding	2022-06-22	brute force, dp, math, number theory	39
A BIT of an Inequality	2025-03-04	bitmasks, brute force, dp, math	37
Maximum Subsequence Value	2024-03-20	brute force, constructive algorithms	29
Ehab and the Expected XOR Problem	2023-12-20	bitmasks, constructive algorithms	26
Max GEQ Sum	2022-08-29	binary search, constructive algorithms, data structures, divide and conquer	116
Book	2022-06-12	binary search, brute force, data structures, dp	106
Bus Number	2022-08-27	brute force, combinatorics, math	99
Range and Partition	2022-08-28	binary search, constructive algorithms, data structures, greedy	97
Range and Partition	2022-08-28	binary search, constructive algorithms, greedy, two pointers	97
ATM and Students	2022-08-30	binary search, data structures, two pointers	96
Path Queries	2022-08-28	divide and conquer, dsu, graphs, sortings	91
Inversion Value of a Permutation	2025-10-27	constructive algorithms, dfs and similar, dp	90
Vasya And Array	2022-06-19	constructive algorithms, greedy, implementation	89
Maximum Distributed Tree	2022-07-26	dfs and similar, dp, greedy, implementation	87
Explorer Space	2022-08-28	dp, graphs, shortest paths	85
Apollo versus Pan	2022-09-13	bitmasks, brute force, math	83
BA-String	2022-09-05	brute force, dp, greedy, implementation	81
Exponential notation	2022-09-05	implementation, strings	80
High Load	2022-08-22	constructive algorithms, greedy, implementation, trees	72
Recover it!	2022-07-06	dfs and similar, graphs, greedy, number theory	70
Restore Graph	2022-08-21	dfs and similar, graphs, sortings	70
The Golden Age	2021-11-24	brute force, math	67
Uncle Bogdan and Country Happiness	2022-06-16	dfs and similar, greedy, math, trees	67
Tree Cutting (Easy Version)	2022-07-10	dfs and similar, trees	64
Enlarge GCD	2022-07-08	number theory	64
Fancy Fence	2024-03-23	*special, data structures, dsu, implementation	63
Interesting Array	2022-08-12	constructive algorithms, data structures, trees	62
Compression	2022-07-17	dp, implementation, math, number theory	61
Send Boxes to Alice (Easy Version)	2022-07-07	constructive algorithms, greedy, math, number theory	61
Polycarp and String Transformation	2022-07-12	binary search, implementation, sortings, strings	59
Array and Segments (Easy version)	2022-07-11	brute force, greedy, implementation	58
Cleaning the Phone	2022-06-12	binary search, dp, sortings, two pointers	56
Busy Robot	2022-08-23	implementation	55
Problem for Nazar	2022-06-26	constructive algorithms, math	54
Same GCDs	2022-09-05	math, number theory	52
Thematic Contests	2022-06-19	greedy, sortings	52
Nastya Is Buying Lunch	2022-07-25	greedy	52
Maximum Subsequence	2022-06-13	bitmasks, divide and conquer, meet-in-the-middle	50
Make The Fence Great Again	2022-06-16	dp	47
Take a Guess	2022-07-09	bitmasks, constructive algorithms, interactive, math	47
Chef Monocarp	2022-06-22	dp, flows, graph matchings, greedy	46
Maximize!	2022-06-24	binary search, greedy, ternary search, two pointers	46
Primitive Primes	2021-12-31	constructive algorithms, math, ternary search	46
Slime	2022-06-08	dp, greedy, implementation	45
Median on Segments (Permutations Edition)	2022-07-08	sortings	45
Catching Cheaters	2025-10-25	dp, strings	44
Petya and Array	2022-07-05	data structures, divide and conquer, two pointers	43
Attribute Checks	2025-03-11	brute force, data structures, dp, implementation	42
Count Triangles	2022-06-29	binary search, implementation, math, two pointers	42
Compressed Bracket Sequence	2022-06-21	brute force, implementation	41
Mikasa	2022-01-25	binary search, bitmasks, greedy, implementation	39
Extreme Subtraction	2023-12-17	constructive algorithms, dp, greedy	30
Minimum Array	2021-09-02	binary search, data structures, greedy	236
Trailing Loves (or L'oeufs?)	2021-08-18	brute force, implementation, math, number theory	220
Another Problem About Dividing Numbers	2021-06-11	constructive algorithms, math, number theory	212
Harmonious Graph	2021-09-19	constructive algorithms, dfs and similar, dsu, graphs	150
Boris and His Amazing Haircut	2023-02-22	constructive algorithms, data structures, dp, dsu	101
Solve The Maze	2022-01-13	constructive algorithms, dfs and similar, dsu, graphs	95
Array Destruction	2021-12-09	brute force, constructive algorithms, data structures, greedy	79
Square-Free Division (easy version)	2021-11-17	data structures, dp, greedy, math	77
Multiplicity	2022-12-26	data structures, dp, implementation, math	75
Ceil Divisions	2021-12-04	brute force, constructive algorithms, math, number theory	70
Crazy Diamond	2022-01-10	constructive algorithms, sortings	69
Primes and Multiplication	2022-01-20	math, number theory	67
Xenia and Colorful Gems	2021-09-05	binary search, greedy, math, sortings	66
Monsters And Spells	2022-03-30	binary search, data structures, dp, greedy	63
Long Beautiful Integer	2022-01-10	constructive algorithms, greedy, implementation, strings	62
Balanced Removals (Easier)	2021-11-21	constructive algorithms, geometry, greedy	61
Infinite Prefixes	2022-05-10	math, strings	61
Tree Pruning	2025-03-08	brute force, dfs and similar, greedy, sortings	60
Ladder	2021-04-07	dp, implementation, two pointers	60
Pinkie Pie Eats Patty-cakes	2021-12-21	constructive algorithms, greedy, math, sortings	58
Array Product	2025-03-19	constructive algorithms, greedy, math	57
Borya and Hanabi	2023-08-17	bitmasks, brute force, constructive algorithms, implementation	57
Count the Arrays	2021-11-20	combinatorics, math	57
Swap Dilemma	2025-03-26	constructive algorithms, data structures, divide and conquer, greedy	56
The Number Of Good Substrings	2022-03-13	binary search, bitmasks, brute force	55
Quiz Master	2023-03-07	binary search, math, number theory, sortings	53
Cut and Paste	2021-11-25	implementation, math	52
String Deletion	2022-05-06	binary search, data structures, greedy, two pointers	52
Skipping	2025-03-06	constructive algorithms, data structures, divide and conquer, dp	51
Coffee and Coursework (Easy version)	2022-01-13	brute force, greedy	51
Hills And Valleys	2021-01-08	brute force, implementation	50
Color the Fence	2022-04-01	data structures, dp, greedy, implementation	50
Water the Trees	2024-03-05	binary search, greedy, math	49
Cow and Snacks	2021-12-21	dfs and similar, dsu, graphs	49
Monotonic Renumeration	2022-01-06	combinatorics, sortings	48
Circle Game	2021-12-15	games, geometry, math	44
Superhero Battle	2025-03-25	math	43
Extra Element	2025-03-25	implementation, math	42
Hidden Permutations	2025-03-19	dfs and similar, interactive, math	40
Tandem Repeats?	2025-03-23	brute force, strings, two pointers	35
Walk on Matrix	2022-03-28	bitmasks, constructive algorithms, math	34
Devu and his Brother	2023-06-03	binary search, sortings, ternary search, two pointers	31
Goodbye, Banker Life	2025-02-25	2-sat, bitmasks, combinatorics, constructive algorithms	31
Problem with Random Tests	2024-02-27	brute force, dp, greedy, probabilities	26
League of Leesins	2021-09-08	constructive algorithms, implementation	321
Permutation Cycle	2021-07-27	brute force, constructive algorithms	245
Ehab and Prefix MEXs	2021-07-29	brute force, constructive algorithms, greedy	243
Secret Santa	2021-07-17	constructive algorithms, flows, graphs, greedy	243
Permutation by Sum	2021-06-16	brute force, greedy, math	235
Obtain The String	2021-09-08	dp, greedy, strings	235
Weakened Common Divisor	2021-07-22	brute force, greedy, number theory	234
Circular Dance	2021-07-19	implementation	233
p-binary	2021-09-08	bitmasks, brute force, math	233
Zmei Gorynich	2021-07-21	greedy, math	229
Load Testing	2021-07-22	greedy	227
Minimum Value Rectangle	2021-08-28	greedy	227
Row GCD	2021-08-02	math, number theory	226
Row GCD	2022-04-13	math, number theory	226
Coins and Queries	2021-08-27	greedy	226
Welfare State	2021-08-30	data structures, implementation	225
Sequence and Swaps	2021-08-05	dp, greedy, sortings	224
Primes on Interval	2021-07-20	binary search, number theory, two pointers	223
Lonely Numbers	2021-09-03	binary search, math, number theory, two pointers	219
Stas and the Queue at the Buffet	2021-09-06	greedy, math, sortings	218
Make It Equal	2021-08-29	greedy	218
Two Arrays and Sum of Functions	2021-08-30	greedy, math, sortings	211
Erase and Extend (Easy Version)	2021-08-03	binary search, brute force, dp, greedy	210
Circle of Monsters	2021-09-03	brute force, constructive algorithms, greedy, math	209
Orac and LCM	2021-06-13	data structures, math, number theory	208
RGB Substring (hard version)	2021-07-02	data structures, dp, implementation, two pointers	203
Strange Function	2021-07-04	math, number theory	201
Secrets	2021-06-15	greedy	190
Cat Party (Hard Edition)	2021-05-09	data structures, implementation	136
Colored Portals	2025-03-04	binary search, brute force, data structures, graphs	93
Celex Update	2021-09-02	math	91
Maximum Set	2023-03-06	binary search, math	87
Nastya Studies Informatics	2021-11-02	math, number theory	79
Basic Diplomacy	2021-11-06	brute force, constructive algorithms, greedy, implementation	74
Mukhammadali and the Smooth Array	2025-10-28	data structures, dp	74
Distinct Characters Queries	2021-10-11	data structures	71
Make Them Equal	2022-02-04	dp, greedy	70
K for the Price of One (Hard Version)	2022-01-10	dp, greedy, sortings	70
Rectangles	2021-11-19	geometry, implementation, sortings	67
Military Problem	2021-10-25	dfs and similar, graphs, trees	66
Divide and Summarize	2021-11-07	binary search, brute force, data structures, divide and conquer	62
Azamon Web Services	2021-11-11	greedy	61
Constructing the Array	2021-10-30	constructive algorithms, data structures, sortings	60
The Meeting Place Cannot Be Changed	2022-02-05	binary search	56
Minimal Height Tree	2022-01-09	graphs, greedy, shortest paths, trees	56
Polycarp's phone book	2021-12-01	data structures, implementation, sortings	55
Maximum Subrectangle	2021-09-11	binary search, implementation, two pointers	55
Cutting Out	2021-09-26	binary search, sortings	54
Hamburgers	2021-04-06	binary search, brute force	53
Vupsen, Pupsen and 0	2021-10-28	constructive algorithms, math	51
Boboniu and Bit Operations	2021-10-06	bitmasks, brute force, dp, greedy	51
Say No to Palindromes	2021-10-18	brute force, constructive algorithms, dp, strings	51
Modified GCD	2022-02-10	binary search, number theory	51
MEX maximizing	2021-10-07	data structures, greedy, implementation, math	50
Good Subarrays	2021-11-07	data structures, dp, math	47
MP3	2021-10-16	two pointers	45
Set or Decrease	2024-04-21	binary search, brute force, greedy, sortings	45
Hilbert's Hotel	2021-12-01	math, number theory, sortings	45
Product 1 Modulo N	2021-11-17	greedy, number theory	44
Hilbert's Hotel	2021-10-21	math, sortings	44
Sasha and a Bit of Relax	2021-10-11	dp, implementation	44
New Year and Permutation	2021-11-10	combinatorics, math	43
Mind Control	2021-09-11	brute force, data structures, greedy, math	42
Multi-Subject Competition	2021-09-14	greedy, sortings	39
Beautiful Palindromes	2025-10-19	constructive algorithms, greedy, schedules	39
k-LCM (hard version)	2021-03-22	constructive algorithms, math	36
Geometry Horse	2023-08-11	greedy, implementation, sortings, two pointers	36
The Phone Number	2021-11-03	constructive algorithms, greedy	33
Good Key, Bad Key	2022-07-12	bitmasks, brute force, dp, greedy	33
k-Amazing Numbers	2021-07-12	binary search, data structures, implementation, two pointers	249
Magic Powder - 2	2021-07-13	binary search, implementation	236
Curiosity Has No Limits	2021-08-23		233
Candies Distribution	2021-08-08	constructive algorithms, implementation	231
Farewell Party	2021-08-08	constructive algorithms, implementation	230
Balanced Ternary String	2021-06-20	greedy, strings	229
Uniqueness	2021-07-06	binary search, brute force, implementation, two pointers	227
Curriculum Vitae	2021-07-13	brute force, implementation	226
Two Seals	2021-07-13	brute force, implementation	224
Hongcow Builds A Nation	2021-06-09	dfs and similar, graphs	223
Coach	2021-06-01	brute force, dfs and similar, graphs	223
Bicolored RBS	2021-07-09	constructive algorithms, greedy	222
Decrease the Sum of Digits	2021-07-13	greedy, math	221
Polycarp and Div 3	2021-08-05	dp, greedy, number theory	221
Divide The Students	2021-07-12	binary search, greedy, math	215
Zero Quantity Maximization	2021-08-05	hashing, math, number theory	215
Beautiful Regional Contest	2021-07-01	greedy, implementation	214
Close Tuples (easy version)	2021-06-24	binary search, combinatorics, math, sortings	214
Interesting Function	2021-07-14	binary search, dp, math, number theory	214
Division and Union	2021-06-27	sortings	212
The Fair Nut and String	2021-08-09	combinatorics, dp, implementation	212
Polycarp's New Job	2021-08-14	implementation	212
Fly	2021-06-22	binary search, math	211
Walking Robot	2021-06-22	greedy	211
Bear and Three Musketeers	2021-06-28	brute force, dfs and similar, graphs, hashing	210
Kolya and Tandem Repeat	2021-06-29	brute force, implementation, strings	207
Cow and Message	2021-07-05	brute force, dp, math, strings	205
A Tale of Two Lands	2021-07-12	binary search, sortings, two pointers	205
RGB Substring (easy version)	2021-07-02	implementation	203
Friends and Gifts	2021-06-04	constructive algorithms, data structures, math	203
Xenia and Spies	2021-06-20	brute force, greedy, implementation	202
Case of Matryoshkas	2021-06-03	implementation	197
Divisibility by Eight	2021-05-17	brute force, dp, math	197
Minimum Grid Path	2021-06-30	brute force, data structures, greedy, math	195
Binary String To Subsequences	2021-05-26	constructive algorithms, data structures, greedy, implementation	194
Suitable Replacement	2021-06-07	binary search, greedy, implementation	192
Hyperset	2021-05-31	brute force, data structures, implementation	191
Qualification Rounds	2021-06-03	bitmasks, brute force, constructive algorithms, dp	188
K-Complete Word	2021-05-22	dfs and similar, dsu, greedy, implementation	187
Prefix-Suffix Palindrome (Easy version)	2021-05-20	hashing, string suffix structures, strings	186
Restoring the Permutation	2021-05-18	constructive algorithms, implementation	186
Good Numbers (hard version)	2021-05-23	binary search, greedy, math, meet-in-the-middle	183
Binary String Minimizing	2021-06-02	greedy	181
BerOS File Suggestion	2021-06-01	brute force, implementation	180
Dubious Cyrpto	2021-05-27	binary search, brute force, math, number theory	180
Modulo Equality	2021-05-27	brute force, sortings	179
a-Good String	2021-06-01	bitmasks, brute force, divide and conquer, dp	178
Two Substrings	2021-05-24	brute force, dp, greedy, implementation	178
Secret	2021-06-03	constructive algorithms, implementation	177
Submarine in the Rybinsk Sea (easy edition)	2021-05-21	combinatorics, math, number theory	176
Cellular Network	2021-05-21	binary search, implementation, two pointers	174
Power Sequence	2021-06-01	brute force, math, number theory, sortings	173
Nick and Array	2021-05-27	greedy, implementation	171
A and B	2021-05-25	greedy, math	171
Killjoy	2021-05-29	greedy, implementation, math	167
Did you mean...	2021-05-19	dp, greedy, implementation	160
Smallest Word	2021-05-18	constructive algorithms, greedy, implementation	157
Zero Array	2021-05-19	greedy, math	150
The Child and Set	2021-04-19	bitmasks, greedy, implementation, sortings	149
Dasha and Password	2021-05-14	brute force, dp, implementation	148
Valeriy and Deque	2021-05-04	data structures, implementation	139
Good String	2021-05-03	brute force, dp, greedy, two pointers	138
Which floor?	2021-05-08	brute force, implementation	125
Cyclic Components	2021-02-04	dfs and similar, dsu, graphs	123
Secret Passwords	2021-02-04	dfs and similar, dsu, graphs	118
Kefa and Park	2021-01-18	dfs and similar, graphs, trees	106
Searching for Graph	2021-04-27	brute force, constructive algorithms, graphs	105
Non-zero Segments	2021-07-09	constructive algorithms, data structures, greedy, sortings	103
Trains	2021-01-18	implementation, math, number theory	82
Did We Get Everything Covered?	2025-01-08	constructive algorithms, dp, greedy, shortest paths	79
Almost Arithmetic Progression	2022-02-07	brute force, implementation, math	69
Bear and Friendship Condition	2022-02-10	dfs and similar, dsu, graphs	59
Ayoub and Lost Array	2022-08-13	combinatorics, dp, math	54
New Year and Curling	2022-01-11	brute force, geometry, implementation, math	52
Divan and bitwise operations	2021-11-26	bitmasks, combinatorics, constructive algorithms, dp	49
Representative Edges	2021-12-29	brute force, geometry, implementation, math	47
Tea Tasting	2025-03-20	binary search, data structures, implementation	46
Math	2022-12-14	greedy, math, number theory	34
Do You Love Your Hero and His Two-Hit Multi-Target Attacks?	2025-02-25	binary search, brute force, constructive algorithms, dp	33
Tetrahedron	2021-02-21	dp, math, matrices	25
Yuhao and a Parenthesis	2021-08-13	greedy, implementation	255
Space Formula	2021-08-06	greedy	233
Diverse Garland	2021-08-19	constructive algorithms, dp, greedy	232
Array K-Coloring	2021-08-07	greedy, sortings	226
Powers Of Two	2021-08-12	bitmasks, greedy	225
Magic Powder - 1	2021-07-13	binary search, brute force, implementation	224
New Year and the Sphere Transmission	2021-08-23	math, number theory	207
Orac and Models	2021-06-29	dp, math, number theory	204
Splitting money	2021-08-07	implementation	203
Ehab and a 2-operation task	2021-08-10	constructive algorithms, greedy, math	202
Number Game	2021-05-18	games, math, number theory	176
NEKO's Maze Game	2021-05-15	data structures, dsu, implementation	150
Add to Neighbour and Remove	2021-05-15	greedy, math, number theory	148
Tanya and Postcard	2021-04-19	greedy, implementation, strings	146
Maximum Median	2021-05-13	binary search, greedy, math, sortings	146
The Delivery Dilemma	2021-05-13	binary search, greedy, sortings	144
Design Tutorial: Make It Nondeterministic	2021-05-11	greedy	144
Epic Transformation	2021-05-16	constructive algorithms, data structures, greedy	140
One Bomb	2021-05-14	implementation	139
News Distribution	2021-05-03	dfs and similar, dsu, graphs	138
K for the Price of One (Easy Version)	2021-05-16	dp, greedy, sortings	135
Berland Regional	2021-05-08	brute force, data structures, greedy, number theory	130
Sonya and Queries	2021-05-03	data structures, implementation	126
Rotation Matching	2021-05-11	constructive algorithms, data structures, greedy, implementation	125
Birthday	2021-05-13	math	120
Special Offer! Super Price 999 Bourles!	2021-04-27	implementation	118
Ball in Berland	2021-05-01	combinatorics, graphs, math	116
Bash's Big Day	2021-05-06	greedy, math, number theory	111
Element Extermination	2021-04-23	constructive algorithms, data structures, greedy	108
The World is a Theatre	2021-01-21	combinatorics, math	89
You Soared Afar With Grace	2025-04-05	constructive algorithms, data structures, greedy, implementation	67
Fighting Tournament	2022-08-16	binary search, data structures, implementation, two pointers	67
Meximum Array	2022-01-22	constructive algorithms, data structures, greedy, math	62
A Compatible Pair	2022-11-04	brute force, games	60
Books Queries	2022-06-17	implementation	59
Vanya and Exams	2020-12-21	greedy, sortings	58
Where is the Pizza?	2025-03-03	data structures, dfs and similar, dsu, graphs	56
Trinity	2025-03-02	binary search, math, sortings, two pointers	52
The Cunning Seller (hard version)	2025-09-06	binary search, greedy, math	52
Guess the Array	2021-09-23	constructive algorithms, interactive, math	51
Game on Permutation	2025-03-10	data structures, dp, games, greedy	50
DZY Loves Chemistry	2021-04-06	dfs and similar, dsu, greedy	42
Beautiful Permutation	2025-10-19	binary search, interactive	41
Colorful Field	2021-01-04	implementation, sortings	36
Fadi and LCM	2022-07-18	brute force, math, number theory	32
Pair of Topics	2021-05-09	binary search, data structures, sortings, two pointers	24
Coin Rows	2021-07-30	brute force, constructive algorithms, dp, implementation	232
Deep Down Below	2021-08-24	binary search, greedy, sortings	232
Co-growing Sequence	2021-08-15	bitmasks, constructive algorithms, greedy	215
Number of Pairs	2021-06-10	binary search, data structures, math, two pointers	204
Find The Bone	2021-04-30	implementation	124
Pokémon Army (easy version)	2021-04-30	constructive algorithms, dp, greedy	121
Koala and Lights	2021-05-01	implementation, math, number theory	121
Vasya and Golden Ticket	2021-05-01	implementation	118
Jatayu's Balanced Bracket Sequence	2022-09-06	data structures, dsu, graphs, greedy	116
Number into Sequence	2021-01-12	constructive algorithms, math, number theory	101
Chat Online	2021-01-17	implementation	94
3SUM Closure	2022-06-28	brute force, data structures	75
Constructive Problem	2025-03-02	brute force, greedy	70
Sort the Array	2021-01-04	implementation, sortings	65
Summarize to the Power of Two	2021-01-22	brute force, greedy, implementation	59
Summer sell-off	2021-01-04	greedy, sortings	58
Non-Descending Arrays	2025-10-17	combinatorics, dp, math	57
New Game	2025-03-11	binary search, brute force, greedy, implementation	55
Good Subarrays (Easy Version)	2022-10-10	binary search, data structures, schedules, two pointers	54
Monocarp's String	2025-10-27	binary search, greedy, strings	52
Long Number	2021-01-04	greedy	48
Rubik's Cube Coloring (easy version)	2021-10-08	combinatorics, math	48
Double Perspective	2025-09-03	constructive algorithms, dp, dsu, graphs	47
Box Fitting	2021-04-07	binary search, bitmasks, data structures, greedy	47
Closest Cities	2025-03-22	greedy, implementation, math	44
Maximal AND	2022-04-21	bitmasks, greedy, math	43
Concatenation of Arrays	2025-03-05	constructive algorithms, greedy, sortings	42
And It's Non-Zero	2021-12-25	bitmasks, greedy, math	42
Coloring Game	2025-08-31	binary search, brute force, greedy, two pointers	41
Just Eat It!	2022-07-18	dp, greedy, implementation	41
For Wizards, the Exam Is Easy, but I Couldn't Handle It	2025-02-25	brute force, greedy, implementation	40
Jeff and Periods	2021-04-02	implementation, sortings	40
Economy Game	2022-02-10	brute force	40
Duff in Love	2021-04-03	math	39
Omkar and Last Class of Math	2022-07-10	greedy, math, number theory	37
Easy Number Challenge	2021-04-02	implementation, number theory	37
Arrow Path	2025-03-23	brute force, constructive algorithms, dfs and similar, dp	36
Chocolate	2021-04-02	combinatorics	35
Find the Permutation	2025-11-03	brute force, dfs and similar, graphs, implementation	34
Fox Dividing Cheese	2021-04-03	math, number theory	31
Remove the Ends	2025-04-29	brute force, constructive algorithms, dp, greedy	30
I.O.U.	2021-04-02	implementation	27
Getting Zero	2024-03-05	bitmasks, brute force, dfs and similar, dp	25
Pursuit	2021-07-17	binary search, brute force, greedy, sortings	239
Mocha and Hiking	2021-08-15	constructive algorithms, graphs	231
Pleasant Pairs	2021-06-25	brute force, implementation, math, number theory	197
Prinzessin der Verurteilung	2021-06-06	brute force, constructive algorithms, strings	183
And	2021-04-30	greedy	137
Kirill And The Game	2021-05-13	brute force, two pointers	126
Lecture Sleep	2021-04-29	data structures, dp, implementation, two pointers	123
Odd Selection	2021-04-30	brute force, implementation, math	119
Balanced Team	2021-05-06	sortings, two pointers	114
Three Parts of the Array	2021-01-23	binary search, data structures, two pointers	106
Devu, the Dumb Guy	2021-01-14	implementation, sortings	100
Students and Shoelaces	2021-01-18	brute force, dfs and similar, graphs, implementation	100
Hungry Sequence	2021-01-14	math	89
Incinerate	2022-12-19	binary search, brute force, data structures, implementation	71
Restoring Permutation	2022-02-10	greedy	71
Make Them Equal	2021-10-08	brute force, greedy, math, strings	65
Even-Odd Game	2021-01-04	dp, games, greedy, sortings	59
Kuriyama Mirai's Stones	2021-01-02	dp, implementation, sortings	56
Vanya and Lanterns	2021-01-02	binary search, implementation, math, sortings	56
Playing with GCD	2022-10-10	math, number theory	55
Great Sequence	2022-02-23	greedy, sortings	54
Make It Ugly	2025-03-18	implementation, math	50
Against the Difference	2025-10-17	data structures, dp	50
Chloe and the sequence	2021-01-04	binary search, bitmasks, constructive algorithms, implementation	49
Beautiful Paintings	2022-02-07	greedy, sortings	49
Delete Two Elements	2021-10-10	data structures, dp, implementation, math	48
Build Permutation	2022-08-06	constructive algorithms, dp, math	48
Coins	2020-12-31	implementation	45
Prefix Sum Primes	2022-07-18	constructive algorithms, greedy, math, number theory	45
Diamond Miner	2021-12-30	geometry, greedy, sortings	44
Even Larger	2025-09-03	brute force, greedy, implementation	42
Filya and Homework	2021-03-04	implementation, sortings	42
Double Sort	2025-03-19	implementation, sortings	35
Roma and Changing Signs	2021-03-07	greedy	33
Creating Keys for StORages Has Become My Main Skill	2025-02-25	bitmasks, constructive algorithms, greedy	32
Fancy Coins	2025-03-10	binary search, brute force, greedy, math	31
Palindromic Subsequences	2025-11-03	brute force, constructive algorithms, math	31
k-LCM (easy version)	2021-03-17	constructive algorithms, math	31
Make Almost Equal With Mod	2025-03-03	bitmasks, constructive algorithms, math, number theory	30
Forming Triangles	2025-03-22	combinatorics, constructive algorithms, math, sortings	27
Long Multiplication	2025-03-18	greedy, math, number theory	27
Cat Cycle	2025-03-03	math, number theory	25
Escape from Stones	2023-08-07	greedy, implementation	19
Lord of the Values	2021-05-30	constructive algorithms	197
Sifid and Strange Subsequences	2021-05-24	greedy, math, sortings	194
Hate "A"	2021-04-25	implementation, strings	129
GCD Compression	2021-04-28	constructive algorithms, math, number theory	119
Strange List	2021-04-26	brute force, greedy, implementation, math	110
Making a String	2021-04-27	greedy, sortings	109
Lucky Sum	2021-01-18	implementation	98
Card Game	2025-08-21	brute force, constructive algorithms, games, greedy	79
Math Problem	2021-01-12	math	78
Max and Mex	2021-12-30	math	73
Division by Two and Permutation	2022-02-07	constructive algorithms, flows, graph matchings, greedy	65
Shrinking Array	2025-08-31	brute force, greedy	57
Long Jumps	2021-01-04	dp, graphs	56
Mainak and Interesting Sequence	2022-09-06	bitmasks, constructive algorithms, math	56
Fence	2021-01-02	brute force, dp	54
Kind Anton	2022-08-24	greedy, implementation	53
Perfecto	2025-02-28	brute force, constructive algorithms, greedy, math	51
Special Numbers	2021-10-08	bitmasks, math	51
Petya and Countryside	2020-12-23	brute force, implementation	49
Effective Approach	2020-12-31	implementation	48
Zuhair and Strings	2022-08-13	brute force, implementation, strings	48
All are Same	2021-10-13	math, number theory	46
Beautiful XOR	2025-10-19	bitmasks, constructive algorithms, greedy	46
Caisa and Pylons	2020-12-30	brute force, implementation, math	45
Salem and Sticks	2022-08-13	brute force, implementation	45
Save the Magazines	2024-02-27	constructive algorithms, dp, greedy	43
Robin Hood in Town	2025-04-29	binary search, greedy, math	40
Mirror in the String	2021-12-29	greedy, strings	40
Combinatorics Homework	2021-09-20	combinatorics, greedy, math	40
Bouquet (Easy Version)	2025-03-15	binary search, brute force, greedy, sortings	37
Ping-pong	2020-11-30	constructive algorithms, games, math	37
Buying Lemonade	2025-03-05	binary search, constructive algorithms, sortings	37
Splitting Items	2025-03-04	games, greedy, sortings	36
Turtle Fingers: Count the Values of k	2025-11-06	brute force, implementation, math, number theory	35
GCD Length	2021-04-12	constructive algorithms, math, number theory	33
Increase/Decrease/Copy	2025-03-09	greedy, implementation	32
MIN = GCD	2025-04-05	greedy, math, number theory	31
Subsequence Addition (Hard Version)	2025-03-03	bitmasks, dp, greedy, implementation	31
Fibonacci Cubes	2025-08-29	brute force, dp, implementation, math	29
Equal Values	2025-08-29	brute force, greedy, two pointers	28
Array Fix	2025-03-23	brute force, dp, greedy, implementation	26
Binomial Coefficients, Kind Of	2025-03-11	combinatorics, dp, math	24
Scenes From a Memory	2021-08-26	brute force, constructive algorithms, implementation, math	262
MEXor Mixup	2021-09-05	bitmasks, greedy	225
Add and Divide	2021-02-12	brute force, greedy, math, number theory	169
Board Moves	2021-02-13	math	143
String LCM	2021-01-14	brute force, math, number theory, strings	130
Not Adjacent Matrix	2021-05-05	constructive algorithms	121
OKEA	2022-02-06	constructive algorithms	65
Divan and a New Project	2021-11-26	constructive algorithms, sortings	62
Different Divisors	2021-01-19	binary search, constructive algorithms, greedy, math	61
Shoe Shuffling	2022-05-31	constructive algorithms, greedy, implementation, two pointers	59
Bear and Finding Criminals	2020-12-23	constructive algorithms, implementation	57
Red and Blue	2020-12-28	dp, greedy	57
Regular Bracket Sequence	2020-12-28	constructive algorithms, greedy	56
Sum of Digits	2020-12-30	implementation	51
Beautiful Array	2022-08-20	constructive algorithms, greedy, math	51
Optimal Reduction	2022-08-06	constructive algorithms, sortings	51
Save More Mice	2021-10-13	binary search, greedy	50
Mahmoud and a Triangle	2021-01-04	constructive algorithms, geometry, greedy, math	49
Chess Tournament	2024-03-12	constructive algorithms	48
Polycarp Recovers the Permutation	2021-11-25	constructive algorithms	46
Deck of Cards	2025-10-27	greedy, implementation	44
Lovely Palindromes	2021-01-04	constructive algorithms, math	42
Maximum Cost Permutation	2025-10-17	constructive algorithms, greedy	42
Yet Another Permutation Problem	2023-08-15	constructive algorithms, greedy, math, number theory	39
Berland Music	2024-04-21	data structures, greedy, math, sortings	37
Move to the End	2025-08-21	brute force, data structures, dp, greedy	36
Game with Doors	2025-03-04	brute force, greedy	32
Beautiful String	2025-10-19	brute force, constructive algorithms	32
Generate Login	2021-03-24	brute force, greedy, sortings	30
Double-ended Strings	2021-03-25	brute force, implementation, strings	29
Valera and Antique Items	2021-03-24	implementation	27
The Cunning Seller (easy version)	2025-09-06	greedy, math	25
Points on Plane	2024-03-01	binary search, greedy, math	16
Mocha and Red and Blue	2021-08-15	dp, greedy	224
Exciting Bets	2021-07-07	greedy, math, number theory	212
Mocha and Math	2021-08-15	bitmasks, constructive algorithms, math	204
Customising the Track	2021-07-07	combinatorics, greedy, math	201
Bad Boy	2021-06-18	constructive algorithms, greedy, math	185
Array Reodering	2021-06-04	brute force, greedy, math, number theory	174
Unique Number	2021-05-15	brute force, greedy, math	142
Permutation Sort	2021-05-16	constructive algorithms, greedy	129
The Great Hero	2021-02-07	greedy, implementation, sortings	111
Make it Divisible by 25	2021-10-13	dfs and similar, dp, greedy, math	106
Odd Divisor	2021-01-25	math, number theory	99
Strange Partition	2021-01-05	greedy, math, number theory	70
Special Permutation	2021-11-23	constructive algorithms, greedy	66
Wizard of Orz	2021-01-08	constructive algorithms, greedy, math	65
Burglar and Matches	2020-12-24	greedy, implementation, sortings	51
Mainak and Array	2022-09-06	greedy, math	51
Delete from the Left	2021-01-02	brute force, implementation, strings	49
Tiling Challenge	2022-07-18	greedy, implementation	48
Decoding	2020-12-31	implementation, strings	46
GCD Problem	2021-12-17	brute force, constructive algorithms, math, number theory	38
Make AP	2022-01-10	implementation, math	35
Rule of League	2025-03-03	constructive algorithms, math	35
Napoleon Cake	2021-03-13	dp, implementation, sortings	33
The Secret Number	2025-09-06	math	29
Not a Substring	2025-03-10	constructive algorithms, strings	28
Football	2020-09-19	implementation, strings	28
Having Been a Treasurer in the Past, I Help Goblins Deceive	2025-02-25	combinatorics, constructive algorithms, strings	28
Expensive Number	2025-04-29	greedy, math	26
Promo	2025-03-17	greedy, sortings	26
Ideal Point	2025-03-20	brute force, geometry, greedy	26
Oath of the Night's Watch	2022-08-19	constructive algorithms, sortings	25
Painting the Ribbon	2025-03-18	constructive algorithms, greedy, math	22
AquaMoon and Two Arrays	2021-07-11	brute force, greedy	234
Putting Plates	2021-07-17	constructive algorithms, implementation	233
Simply Strange Sort	2021-08-24	brute force, implementation, sortings	222
Domino Disaster	2021-09-05	implementation, strings	219
Wonderful Coloring - 1	2021-07-23	greedy, strings	214
Polycarp and Coins	2021-07-23	greedy, math	212
Binary Decimal	2021-07-17	greedy, math	212
Got Any Grapes?	2021-08-18	brute force, greedy, implementation	208
The Miracle and the Sleeper	2021-08-26	greedy, math	203
Pretty Permutations	2021-06-25	constructive algorithms, greedy, implementation	193
Omkar and Bad Story	2021-06-06	brute force, constructive algorithms	193
Arithmetic Array	2021-06-18	greedy, math	189
Stone Game	2021-06-10	brute force, dp, greedy	185
Friends and Candies	2021-06-10	greedy, math	179
Eshag Loves Big Arrays	2021-05-24	constructive algorithms, greedy, math	167
Fair Playoff	2021-06-04	brute force, implementation	165
Equality	2021-05-30	implementation, strings	164
And Then There Were K	2021-05-20	bitmasks	156
Two Arrays And Swaps	2021-02-13	greedy, sortings	149
Watermelon	2021-02-09	brute force, math	148
Magical Sticks	2021-02-09	math	139
Common Subsequence	2021-05-15	brute force	131
Yet Another String Game	2021-02-07	games, greedy, strings	126
Phoenix and Gold	2021-05-02	constructive algorithms, greedy, math	122
Do Not Be Distracted!	2021-05-05	brute force, implementation	115
The Cake Is a Lie	2021-04-29	dp, math	111
Ordinary Numbers	2021-05-05	brute force, math, number theory	110
Divide it!	2021-02-04	brute force, greedy, implementation	108
Red and Blue Beans	2021-04-29	math	108
Replacing Elements	2021-01-14	greedy, implementation, math, sortings	105
Nezzar and Colorful Balls	2021-01-28	brute force, greedy	100
Add Odd or Subtract Even	2021-01-24	greedy, implementation, math	98
Puzzle From the Future	2021-01-19	greedy	90
Maximum GCD	2021-01-18	greedy, implementation, math, number theory	78
Beautiful Year	2020-08-11	brute force	77
Fair Division	2021-01-04	dp, greedy, math	59
Absolute Maximization	2022-12-19	bitmasks, constructive algorithms, greedy, math	59
Last minute enhancements	2020-12-30	dp, greedy	56
Bovine Dilemma	2020-12-30	brute force, geometry, math	54
Tanya and Stairways	2021-01-02	implementation	53
Make Even	2021-11-25	constructive algorithms, math	53
Distance	2021-11-22	brute force, constructive algorithms	52
Technical Support	2022-10-23	greedy	51
Cards for Friends	2021-01-04	greedy, math	50
Mathematical Circus	2022-08-16	constructive algorithms, math	49
Kevin and Permutation	2022-10-23	constructive algorithms, greedy, math	49
Divan and a Store	2021-11-26	brute force, constructive algorithms, greedy	48
Gamer Hemose	2021-10-03	binary search, greedy, math, sortings	48
Cancel the Trains	2020-12-04	implementation	46
Anton and Danik	2020-08-11	implementation, strings	46
Unique Bid Auction	2020-11-24	implementation	45
Traveling Salesman Problem	2022-08-06	geometry, greedy, implementation	45
Love Triangle	2020-12-06	graphs	44
Patchouli's Magical Talisman	2022-06-03	bitmasks, constructive algorithms, greedy, sortings	44
Two Towers	2025-03-20	brute force, implementation, strings	43
Integer Diversity	2021-12-29	implementation	42
GCD Arrays	2022-01-22	greedy, math, number theory	42
Turtle Math: Fast Three Task	2025-11-06	implementation, math, number theory	42
Special Permutation	2020-11-24	constructive algorithms, probabilities	40
There Are Two Types Of Burgers	2021-04-15	brute force, greedy, implementation, math	40
Average Height	2021-04-16	constructive algorithms	40
Word	2020-08-11	implementation, strings	40
Amusing Joke	2020-09-19	implementation, sortings, strings	39
Download More RAM	2022-01-22	brute force, greedy, sortings	39
Elections	2021-10-13	math	38
Reverse and Concatenate	2022-02-06	greedy, strings	38
Team Composition: Programmers and Mathematicians	2021-11-25	binary search, constructive algorithms, math	37
Boring Apartments	2020-11-17	implementation, math	37
Rising Sand	2022-06-28	constructive algorithms, greedy, implementation	37
Cirno's Perfect Bitmasks Classroom	2022-06-03	bitmasks, brute force	37
XOR Mixup	2022-06-28	bitmasks, brute force	37
Strange Functions	2020-11-30	math, number theory	36
Consecutive Sum Riddle	2021-10-08	math	36
Chip Game	2022-08-16	games, math	36
Three Pairwise Maximums	2020-08-04	math	36
Crossmarket	2022-08-20	constructive algorithms, greedy, math	35
Alexey and Train	2021-03-13	implementation	35
In-game Chat	2021-04-14	implementation	35
Restore the Permutation by Merger	2020-08-04	greedy	34
Cut the Array	2025-10-17	brute force, constructive algorithms, math, number theory	33
Verify Password	2025-03-09	implementation, sortings, strings	32
Beat The Odds	2022-05-31	brute force, greedy, math	32
Homework	2025-09-06	brute force, implementation, strings	32
Review Site	2021-04-12	greedy	32
Next Round	2020-08-02	*special, implementation	32
Omkar and Completion	2022-07-10	constructive algorithms, implementation	31
Turtle Puzzle: Rearrange and Negate	2025-11-06	greedy, math, sortings	31
Bit++	2020-08-02	implementation	31
Permutation	2025-03-10	greedy	30
Petya and Strings	2020-08-02	implementation, strings	29
Meximization	2021-03-17	brute force, data structures, greedy, sortings	29
Helpful Maths	2020-08-03	greedy, implementation, sortings, strings	29
Stock Arbitraging	2022-07-18	greedy, implementation	28
Game with Cards	2025-03-19	games, greedy	28
Garland	2024-03-01	implementation	28
Closest Point	2025-03-04	implementation, math	28
Anti-knapsack	2021-03-06	constructive algorithms, greedy	28
Queue at the School	2020-08-11	constructive algorithms, graph matchings, implementation, shortest paths	28
Nearly Lucky Number	2020-08-11	implementation	28
Magnets	2020-08-12	implementation	28
Diagonals	2025-03-15	brute force, greedy, implementation, math	27
Elephant	2020-08-04	math	27
Mezo Playing Zoma	2022-07-18	math	26
Beautiful Matrix	2021-02-11	implementation	26
Card Trick	2025-03-19	implementation, math	26
Shape Perimeter	2025-11-03	constructive algorithms, math	26
Grass Field	2025-03-10	implementation	26
Vanya and Fence	2020-08-12	implementation	26
Ultra-Fast Mathematician	2020-08-13	implementation	26
Balanced Substring	2024-03-12	implementation	25
Special Characters	2025-03-23	brute force, constructive algorithms	25
Strange Table	2021-03-25	math	25
Candies for Nephews	2025-10-27	math	25
Hulk	2020-08-20	implementation	25
Translation	2020-08-11	implementation, strings	25
Array Balancing	2024-03-05	greedy, math	24
Energy Crystals	2025-08-29	greedy, implementation, math	24
Tram	2020-08-03	implementation	24
Insomnia cure	2020-08-20	constructive algorithms, implementation, math	24
In Search of an Easy Problem	2020-08-12	implementation	24
Max and Mod	2025-04-05	constructive algorithms, math	23
Drinks	2020-08-13	implementation, math	23
Beautiful Average	2025-10-19	brute force, greedy	23
New World, New Me, New Array	2025-02-25	greedy, implementation, math	23
Presents	2020-08-12	implementation	23
George and Accommodation	2020-08-11	implementation	23
Tanya and Stairways	2024-07-19		23
Two Screens	2025-03-11	binary search, greedy, strings, two pointers	22
Stones on the Table	2020-08-03	implementation	22
Wrong Subtraction	2020-08-04	implementation	22
Three swimmers	2021-02-23	math	21
Tricky Template	2025-03-22	constructive algorithms, implementation, strings	21
Permutation Value	2024-02-27	constructive algorithms, greedy	21
Race	2025-08-31	implementation, math	21
Boy or Girl	2020-08-03	brute force, implementation, strings	21
The Play Never Ends	2025-02-28	math, number theory	21
Construct a Rectangle	2024-04-21	geometry, math	20
Buttons	2023-08-15	games, greedy, math	20
Profitable Interest Rate	2025-03-05	greedy, math	20
Three Decks	2025-08-21	math	19
Password	2024-02-27	brute force, combinatorics, implementation, math	19
Parkway Walk	2025-03-17	greedy, implementation	19
Way Too Long Words	2020-08-02	strings	19
Calculating Function	2020-08-13	implementation, math	19
Game with Board	2025-03-21	constructive algorithms, games	18
Team	2020-08-02	brute force, greedy	18
Soldier and Bananas	2020-08-03	brute force, implementation, math	16
Bear and Big Brother	2020-08-04	implementation	16
Potion-making	2021-05-16	math, number theory	14
Word Capitalization	2020-08-03	implementation, strings	13
Domino piling	2020-08-02	greedy, math	12
Calculate The Area	2021-02-11		148
Directional Move	2021-01-27		107
John and nuts	2021-04-24		107
Make All Odd	2021-01-27		101
Security Badge	2025-10-24		91
Time-travelling Fan	2023-07-17		82
Purple Rain	2025-10-24		66
Sightseeing with Friends	2021-10-28		63
Range	2023-07-11		62
67	2026-06-20		61
Straight Shot	2025-10-24		59
Flint	2022-12-09		59
Grid Coloring	2025-10-24		55
Marbles	2026-06-20		52
Shopping Fever	2023-12-12		51
Railway	2023-12-12		50
Luna Likes Love	2023-12-09		49
Sorted Pairwise Distance List	2023-07-17		47
Introduction to Number Theory	2026-06-20		46
LCS on Permutations	2022-04-20		43
Rabbit Game	2020-11-25		40
Star Arrangements	2025-10-24		40
Catching the Impostor	2020-11-25		39
Coins Game (hard version)	2021-10-28		39
Halfway	2025-10-24		39
Fear Factoring	2025-10-24		39
M	2026-06-20		37
Forbidden Zero	2025-10-24		36
P=NP	2026-06-20		36
Energy	2023-07-11		34
Explorer	2023-07-10		34
Zeros	2023-12-09		34
Unloaded Die	2025-10-24		32
Odd Palindrome	2025-10-24		32
Delayed Work	2025-10-24		23
Whose Turn Is It?	2024-07-23		11
Passing Bills	2020-10-13		9