Submission #591291

#	Time	Username	Problem	Language	Result	Execution time	Memory
591291		piOOE	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	149 ms	11164 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<int> I(m), O(n);
    vector<string> s(n);
    for (int i = 0; i < n; ++i) {
        cin >> s[i];
        for (int j = 0; j < m; ++j) {
            if (s[i][j] == 'I') {
                ++I[j];
            } else if (s[i][j] == 'O') {
                ++O[i];
            }
        }
    }
    long long ans = 0;
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < m; ++j) {
            if (s[i][j] == 'I') {
                --I[j];
            } else if (s[i][j] == 'O') {
                --O[i];
            } else {
                ans += I[j] * 1ll * O[i];
            }
        }
    }
    cout << ans;
    return 0;
}

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