Submission #897365

#	Time	Username	Problem	Language	Result	Execution time	Memory
897365		box	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	86 ms	89328 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
 
const int N = 3000;
 
int main() {
    ios::sync_with_stdio(0), cin.tie(0);
    int n, m; cin >> n >> m;
    static string s[N];
    for (int i = 0; i < n; i++) cin >> s[i];
    static int co[N][N], ci[N][N];
    long long ans = 0;
    for (int i = n - 1; i >= 0; i--) for (int j = m - 1; j >= 0; j--) {
        if (j < m - 1) co[i][j] += co[i][j + 1];
        if (i < n - 1) ci[i][j] += ci[i + 1][j];
        if (s[i][j] == 'J') ans += co[i][j] * ci[i][j];
        else if (s[i][j] == 'O') co[i][j]++;
        else ci[i][j]++;
    }
    cout << ans << '\n';
    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50