Submission #381348

#	Time	Username	Problem	Language	Result	Execution time	Memory
381348		jlallas384	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	286 ms	56044 KiB

joi2019_ho_t1

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

int main(){
    int n,m;
    cin >> n >> m;
    vector<string> g(n);
    for(auto &x: g){
        cin >> x;
    }
    vector<vector<int>> cnt(n+1,vector<int>(m));
    for(int i = n - 1; i >= 0; i--){
        for(int j = 0; j < m; j++){
            cnt[i][j] = cnt[i+1][j] + (g[i][j] == 'I');
        }
    }
    ll ans = 0;
    for(int i = 0; i < n; i++){
        int c = 0;
        for(int j = 0; j < m; j++){
            if(g[i][j] == 'J') c += cnt[i+1][j];
            if(g[i][j] == 'O') ans += c;
        }
    }
    cout << ans;
}

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