Submission #739585

#	Time	Username	Problem	Language	Result	Execution time	Memory
739585		PagodePaiva	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	741 ms	159328 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define N 3010
#define int long long

using namespace std;

int n, m;
char c[N][N];
int dir[N][N], bai[N][N];

int32_t main(){
    cin >> n >> m;

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

    for(int i = 1;i <= n;i++){
        for(int j = m;j > 0;j--){
            dir[i][j] = dir[i][j+1] + (c[i][j] == 'O' ? 1 : 0);
        }
    }

    for(int j = 1;j <= m;j++){
        for(int i = n;i > 0;i--){
            bai[i][j] = bai[i+1][j] + (c[i][j] == 'I' ? 1 : 0);
        }
    }

    int res = 0;

    for(int i = 1;i <= n;i++){
        for(int j = 1;j <= m;j++){
            if(c[i][j] == 'J'){
                res += dir[i][j]*bai[i][j];
            }
        }
    }

    cout << res << "\n";

    return 0;
}

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