Submission #1269717

#	Time	Username	Problem	Language	Result	Execution time	Memory
1269717		yanb	Election (BOI18_election)	C++20	28 / 100	3093 ms	2216 KiB

election

#include <bits/stdc++.h>

using namespace std;

#define int long long
using pii = pair<int, int>;
using t3i = tuple<int, int, int>;

signed main() {
    int n;
    cin >> n;
    string s;
    cin >> s;
    int q;
    cin >> q;
    while (q--) {
        int l, r;
        cin >> l >> r;
        l--; r--;
        int ball = 0, balr = 0;
        vector<int> mball(r - l + 2), mbalr(r - l + 2);
        for (int i = l; i <= r; i++) {
            ball += (s[i] == 'C' ? 1 : -1);
            mball[i - l + 1] = min(mball[i - l], ball);
        }
        for (int i = r; i >= l; i--) {
            balr += (s[i] == 'C' ? 1 : -1);
            mbalr[i - l] = min(mbalr[i - l + 1], balr);
        }
        int ans = 0;
        for (int i = 0; i < r - l + 2; i++) {
            ans = min(ans, mball[i] + mbalr[i]);
        }
        cout << -ans << "\n";
    }
}

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