Submission #594193

#	Time	Username	Problem	Language	Result	Execution time	Memory
594193		Vanilla	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	380 ms	158992 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
typedef long long int64;
const int maxn = 3e3 + 2;
string a [maxn];
int64 row [maxn][maxn], col[maxn][maxn];

int main() {
    int n,m;
    cin >> n >> m;
    for (int i = 1; i <= n; i++){
        cin >> a[i];
        a[i] = "#" + a[i];
        for (int j = 1; j <= m; j++){
            row[i][j] = row[i][j-1] + (a[i][j] == 'O');
        }
    }
    for (int j = 1; j <= m; j++){
        for (int i = 1; i <= n; i++){
            col[j][i] = col[j][i-1] + (a[i][j] == 'I');
        }
    }
    int64 rs = 0;
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= m; j++){
            // cout << i << " " << j << " " << (row[i][n] - row[i][j]) << " " << (col[j][n] - col[j][i]) << "\n";
            if (a[i][j] == 'J') rs+=(row[i][m] - row[i][j]) * (col[j][n] - col[j][i]);
        }
    }
    cout << rs << "\n";
    return 0;
}

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