Submission #1054823

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054823		MercubytheFirst	Election (BOI18_election)	C++17	28 / 100	3073 ms	1108 KiB

election

#include "bits/stdc++.h"
#define endl '\n'
using namespace std;


void solve() {
  int n;
  string s;
  cin >> n >> s;
  int Q;
  cin >> Q;
  while(Q--) {
    int l, r;
    cin >> l >> r;
    --l;
    const int len = r - l;
    string tmp = s.substr(l, len);
    int ans = 0, balance = 0;
    for(int i = 0; i < len; ++i) {
      assert(balance >= 0);
      if(tmp[i] == 'C') {
        balance++;
        continue;
      }
      assert(tmp[i] == 'T');
      if(balance == 0) {
        tmp[i] = 'X';
        ++ans;
      }
      else {
        balance--;
      }
    }
    reverse(tmp.begin(), tmp.end());
    balance = 0;
    for(int i = 0; i < len; ++i) {
      assert(balance >= 0);
      if(tmp[i] == 'C') {
        balance++;
        continue;
      }
      else if(tmp[i] == 'X') {
        continue;
      }
      assert(tmp[i] == 'T');
      if(balance == 0) {
        tmp[i] = 'X';
        ++ans;
      }
      else {
        balance--;
      }
    }
    cout << ans << endl;
  }
}



signed main()  {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  // signed t; cin >> t; while(t--)
    solve();
}

• Subtask 1: 28 / 28
• Subtask 2: 0 / 54
• Subtask 3: 0 / 18