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balanced brackets.cpp
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73 lines (54 loc) ยท 1.3 KB
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#include <bits/stdc++.h>
using namespace std;
string ltrim(const string &);
string rtrim(const string &);
/*
* Complete the 'isBalanced' function below.
*
* The function is expected to return a STRING.
* The function accepts STRING s as parameter.
*/
string isBalanced(string s) {
stack<char> brackets;
for (char& c : s) {
if (c == '[' || c == '{' || c == '(')
brackets.push(c);
else {
if (brackets.empty() || abs(brackets.top() - c) > 2) return "NO";
else brackets.pop();
}
}
if (brackets.empty()) return "YES";
return "NO";
}
int main()
{
ofstream fout(getenv("OUTPUT_PATH"));
string t_temp;
getline(cin, t_temp);
int t = stoi(ltrim(rtrim(t_temp)));
for (int t_itr = 0; t_itr < t; t_itr++) {
string s;
getline(cin, s);
string result = isBalanced(s);
fout << result << "\n";
}
fout.close();
return 0;
}
string ltrim(const string &str) {
string s(str);
s.erase(
s.begin(),
find_if(s.begin(), s.end(), not1(ptr_fun<int, int>(isspace)))
);
return s;
}
string rtrim(const string &str) {
string s(str);
s.erase(
find_if(s.rbegin(), s.rend(), not1(ptr_fun<int, int>(isspace))).base(),
s.end()
);
return s;
}