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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. const int Mod=998244353;
  5.  
  6. void solve() {
  7.  
  8.    int n,k;
  9.    cin >> n >> k;
  10.    string s;
  11.    cin >> s;
  12.  
  13.    if(n==k){
  14.     cout << s << '\n';
  15.     return;}
  16.  
  17.     string ans;
  18.     int open=0;
  19.     int balance=0;
  20.  
  21.    for(int i=0;i<n;i++){
  22.     if(s[i]=='('){
  23.       if(open<k/2){
  24.         ans+="(";
  25.         open++;
  26.         balance++;
  27.       }}
  28.       else {
  29.         if(balance>0){
  30.           ans+=")";
  31.           balance--;
  32.         }
  33.       }
  34.     }
  35.  
  36.    cout << ans << '\n';
  37.  
  38.  
  39. }
  40.  
  41. int main(){ 
  42.     ios::sync_with_stdio(false);
  43.     cin.tie(nullptr);
  44.  
  45.     int t;
  46.     cin >> t;
  47.     while (t--) solve();
  48.  
  49.  
  50.     return 0;
  51. }
  52.  
Success #stdin #stdout 0.01s 5316KB
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https://ideone.com/VDI01Q
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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