Submission #852987

#	Time	Username	Problem	Language	Result	Execution time	Memory
852987		faruk	Election (BOI18_election)	C++17	28 / 100	3044 ms	920 KiB

election

#include <bits/stdc++.h>
#define mp make_pair
#define all(a) a.begin(), a.end()

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

int get(string s) {
    int n = s.size();
    vector<bool> nulli(n);
    int bal = 0;
    for (int i = 0; i < n; i++) {
        if (nulli[i])
            continue;
        if (bal == 0 and s[i] == 'T')
            nulli[i] = true;
        else if (s[i] == 'T')
            bal--;
        else
            bal++;
    }
    bal = 0;
    for (int i = n - 1; i >= 0; i--) {
        if (nulli[i])
            continue;
        if (bal == 0 and s[i] == 'T')
            nulli[i] = true;
        else if (s[i] == 'T')
            bal--;
        else
            bal++;
    }
    return count(all(nulli), true);
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;
    string s;
    cin >>s;
    int q;
    cin >> q;
    while (q--) {
        int l, r;
        cin >> l >> r; r--, l--;
        cout << get(s.substr(l, r - l + 1)) << "\n";
    }
}

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