Submission #1172962

#	Time	Username	Problem	Language	Result	Execution time	Memory
1172962		nguyenkhangninh99	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	249 ms	150740 KiB

joi2019_ho_t1

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

#define int long long

void solve(){
    int n, m; cin >> n >> m;

    vector<vector<char>> c(n + 2, vector<char>(m + 2));
    vector<vector<int>> cnto(n + 2, vector<int>(m + 2)), cnti(n + 2, vector<int>(m + 2));

    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= m; j++){
            cin >> c[i][j];
            if(c[i][j] == 'O') cnto[i][j] = 1;
            if(c[i][j] == 'I') cnti[i][j] = 1;
        }
    }

    int ans = 0;

    for(int i = n; i >= 1; i--){
        for(int j = m; j >= 1; j--) cnti[i][j] += cnti[i + 1][j];
        for(int j = m; j >= 1; j--) cnto[i][j] += cnto[i][j + 1];
        for(int j = m; j >= 1; j--) ans += cnto[i][j] * cnti[i][j] * (c[i][j] == 'J');
    }

    cout << ans;

}
signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0); cout.tie(0);

    solve();
}

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