Submission #1267675

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267675		Alebn	Election (BOI18_election)	C++20	28 / 100	3087 ms	1852 KiB

election

#include <bits/stdc++.h>
#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
using namespace std;

signed main() {
    int n, q, x, y, temp, ma;
    string s;
    cin >> n >> s;
    vector<int> a(n), pref(n);
    for(int i = 0; i < n; i++) {
        if(s[i] == 'C') a[i] = 1;
        else a[i] = -1;
        pref[i] = a[i] + (i ? pref[i - 1] : 0);
    }
    function<int(int,int)> sum = [&](int l, int r) {
        return pref[r] - (l ? pref[l - 1] : 0);
    };
    cin >> q;
    while(q--) {
        cin >> x >> y;
        x--, y--;
        temp = 0, ma = LLONG_MIN;
        for(int i = x; i <= y; i++) {
            temp = min(temp, sum(x, i));
            ma = max(ma, sum(x, i) - temp);
        }
        cout << max(ma - sum(x, y), abs(temp)) << "\n";
    }
}

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