func_code_string: #include <bits/stdc++.h>   using namespace std;   stack<int> s1;   char a[200005];   int flag[200005];   int main() {     int n, k;     scanf( %d%d , &n, &k);     memset(flag, 0, sizeof(flag));     scanf( %s , a);     int l = 0;     for (int i = 0; i < n; i++) {       if (l == k) break;       if (a[i] ==  ( ) {         s1.push(i);       }       if (a[i] ==  )  && !s1.empty()) {         l += 2;         flag[i] = 1;         flag[s1.top()] = 1;         s1.pop();       }     }     for (int i = 0; i < n; i++) {       if (flag[i]) printf( %c , a[i]);     }     printf(  n );   }   