Submission #1258112

#	Time	Username	Problem	Language	Result	Execution time	Memory
1258112		kawhiet	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	99 ms	80968 KiB

joi2019_ho_t1

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, m;
    cin >> n >> m;
    vector<string> s(n);
    for (int i = 0; i < n; i++) {
        cin >> s[i];
    }
    vector<vector<int>> a(n + 1, vector<int>(m + 1));
    vector<vector<int>> b(n + 1, vector<int>(m + 1));
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            a[i][j + 1] = a[i][j] + (s[i][j] == 'O');
            b[i + 1][j] = b[i][j] + (s[i][j] == 'I');
        }
    }
    int64_t ans = 0;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (s[i][j] == 'J') {
                ans += (a[i][m] - a[i][j]) * (b[n][j] - b[i][j]);
            }
        }
    }
    cout << ans << '\n';
    return 0;
}

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