feat(leetcode): solve 200 - Number Of Islands

Author: arnav-on-code

README.md

@@ -22,24 +22,24 @@ Total	122
 
 | Field | Value |
 |------|------|
-| Problem ID | 133 |
-| Title | Clone Graph |
+| Problem ID | 200 |
+| Title | Number Of Islands |
 | Language | Python3 |
-| Runtime | 49 ms |
-| Memory | 19.8 MB |
+| Runtime | 252 ms |
+| Memory | 21.6 MB |
 
 
 💻 Languages Used
 
-- **Python3** : 5
+- **Python3** : 6
 
 ## 📚 Recent Accepted Problems
 
+- 200 Number Of Islands
 - 133 Clone Graph
 - 1 Two Sum
 - 295 Find Median From Data Stream
 - 1 Two Sum
-- 295 Find Median From Data Stream
 
 
 ---
@@ -81,4 +81,4 @@ Git
 GitHub
 ⏰ Last Sync
 
-2026-07-03 14:03:05
+2026-07-03 14:03:07

storage/solutions/0200_Number_Of_Islands/metadata.json

@@ -0,0 +1,11 @@
+{
+    "submission_id": "2053688232",
+    "question_id": "200",
+    "title_slug": "number-of-islands",
+    "language": "python3",
+    "language_verbose": "Python3",
+    "runtime": "252 ms",
+    "memory": "21.6 MB",
+    "status_code": 10,
+    "timestamp": 1783006494
+}

storage/solutions/0200_Number_Of_Islands/solution.py

@@ -0,0 +1,31 @@
+class Solution:
+    def numIslands(self, grid: List[List[str]]) -> int:
+        rows = len(grid)
+        cols = len(grid[0])
+
+        islands = 0
+
+        def dfs(r, c):
+            if (
+                r < 0 or
+                c < 0 or
+                r >= rows or
+                c >= cols or
+                grid[r][c] == "0"
+            ):
+                return
+            grid[r][c]= "0"
+
+            dfs(r + 1, c)
+            dfs(r - 1, c)
+            dfs(r, c + 1)
+            dfs(r, c - 1)
+
+        for r in range(rows):
+            for c in range(cols):
+
+                if grid[r][c]== "1":
+                    islands +=1
+
+                    dfs(r,c)
+        return islands

storage/state.json

@@ -1,3 +1,3 @@
 {
-    "last_submission_id": "2052380776"
+    "last_submission_id": "2054682645"
 }

storage/stats.json

@@ -4,9 +4,13 @@
     "medium": 53,
     "hard": 6,
     "languages": {
-        "Python3": 5
+        "Python3": 6
     },
     "recent_problems": [
+        {
+            "id": "200",
+            "title": "Number Of Islands"
+        },
         {
             "id": "133",
             "title": "Clone Graph"
@@ -22,18 +26,14 @@
         {
             "id": "1",
             "title": "Two Sum"
-        },
-        {
-            "id": "295",
-            "title": "Find Median From Data Stream"
         }
     ],
     "last_problem": {
-        "id": "133",
-        "title": "Clone Graph",
+        "id": "200",
+        "title": "Number Of Islands",
         "language": "Python3",
-        "runtime": "49 ms",
-        "memory": "19.8 MB"
+        "runtime": "252 ms",
+        "memory": "21.6 MB"
     },
-    "last_sync": "2026-07-03 14:03:05"
+    "last_sync": "2026-07-03 14:03:07"
 }