Submission #1212468

#	Time	Username	Problem	Language	Result	Execution time	Memory
1212468		VMaksimoski008	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	467 ms	79820 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 3005;

char a[N][N];
int O[N][N], I[N][N];

signed main() {
    int n, m; cin >> n >> m;

    for(int i=1; i<=n; i++)
        for(int j=1; j<=m; j++) cin >> a[i][j];

    for(int i=1; i<=n; i++)
        for(int j=m; j>=1; j--)
            O[i][j] = O[i][j+1] + (a[i][j] == 'O');
    for(int j=1; j<=m; j++)
        for(int i=n; i>=1; i--)
            I[i][j] = I[i+1][j] + (a[i][j] == 'I');

    ll ans = 0;
    for(int i=1; i<=n; i++)
        for(int j=1; j<=m; j++)
            if(a[i][j] == 'J') ans += (ll)O[i][j] * I[i][j];
    cout << ans << '\n';    
}

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