Submission #789079

#	Time	Username	Problem	Language	Result	Execution time	Memory
789079		Genius3435	Election (BOI18_election)	C++17	28 / 100	3063 ms	1148 KiB

election

#pragma GCC optimize "Ofast,unroll-loops"
#pragma GCC target "avx,avx2,sse4"

#include <bits/stdc++.h>
using namespace std;

int constexpr N = 1<<19;
int upd[N];
char s[N];
int ss[N];

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);
    int n; cin >> n >> s;
    for (int i = 0; i < n; ++i) ss[i] = s[i] == 'C' ? 1 : -1;

    int q; cin >> q;
    for (int qi = 1; qi <= q; ++qi) {
        int l, r; cin >> l >> r; --l;

        int ans = 0;
        for (int i = l, c = 0; i < r; ++i) {
            c += ss[i];
            if (c < 0) ++c, ++ans, upd[i] = qi;
        }
        for (int i = r-1, c = 0; i >= l; --i) {
            c += ss[i] + (upd[i] == qi);
            if (c < 0) ++c, ++ans;
        }

        cout << ans << '\n';
    }
}

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