Submission #1156901

#	Time	Username	Problem	Language	Result	Execution time	Memory
1156901		Pacybwoah	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	131 ms	151464 KiB

joi2019_ho_t1

#include<iostream>
#include<algorithm>
#include<utility>
#include<vector>
using namespace std;
typedef long long ll;
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin >> n >> m;
    vector<string> vec(n);
    for(int i = 0; i < n; i++) cin >> vec[i];
    ll ans = 0;
    vector<vector<ll>> co(n + 1, vector<ll>(m + 1)), ci(n + 1, vector<ll>(m + 1));
    for(int i = n - 1; i >= 0; i--){
        for(int j = m - 1; j >= 0; j--){
            co[i][j] = co[i][j + 1];
            if(vec[i][j] == 'O') co[i][j]++;
            ci[i][j] = ci[i + 1][j];
            if(vec[i][j] == 'I') ci[i][j]++;
            if(vec[i][j] == 'J') ans += co[i][j] * ci[i][j];
        }
    }
    cout << ans << "\n";
}
// g++ -std=c++17 -Wall -Wextra -Wshadow -fsanitize=undefined -fsanitize=address -o run pA.cpp

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