Submission #586951

#	Time	Username	Problem	Language	Result	Execution time	Memory
586951		Justin1	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	767 ms	159032 KiB

joi2019_ho_t1

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

ll n,m,k,x,y,z;
ll O[3005][3005], I[3005][3005];
char ar[3005][3005];

int main() {
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            cin >> ar[i][j];
        }
    }
    for (int i = 1; i <= n; i++) {
        for (int j = m; j >= 1; j--) O[i][j] = O[i][j+1] + (ar[i][j] == 'O');
    }
    for (int i = 1; i <= m; i++) {
        for (int j = n; j >= 1; j--) I[j][i] = I[j+1][i] + (ar[j][i] == 'I');
    }
    ll ans = 0;
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= m; j++) {
            if (ar[i][j] == 'J') ans += O[i][j] * I[i][j];
        }
    }
    cout << ans << "\n";
}

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