Submission #669643

#	Time	Username	Problem	Language	Result	Execution time	Memory
669643		GrandTiger1729	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	289 ms	20660 KiB

joi2019_ho_t1

#include <iostream>
using namespace std;

int main(){
    int n, m; cin >> n >> m;
    string g[n];
    for (int i = 0; i < n; i++){
        cin >> g[i];
    }
    int cntO[n]{}, cntI[m]{};
    for (int i = 0; i < n; i++){
        for (int j = 0; j < m; j++){
            if (g[i][j] == 'O'){
                cntO[i]++;
            }
            if (g[i][j] == 'I'){
                cntI[j]++;
            }
        }
    }
    long long ans = 0;
    for (int i = 0; i < n; i++){
        for (int j = 0; j < m; j++){
            if (g[i][j] == 'O'){
                cntO[i]--;
            }
            if (g[i][j] == 'I'){
                cntI[j]--;
            }
            if (g[i][j] == 'J'){
                ans += cntO[i] * cntI[j];
            }
        }
    }
    cout << ans;
    return 0;
}

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