Submission #794258

#	Time	Username	Problem	Language	Result	Execution time	Memory
794258		dimashhh	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	308 ms	91520 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N = 3e3 + 123;

int n,m;
char a[3100][3100];
int so[N][N],si[N][N];
void test(){
    cin >> n >> m;
    for(int i=1;i<=n;i++){
        for(int j = 1;j <= m;j++){
            cin >> a[i][j];
        }
    }
    for(int i = 1;i <= n;i++){
        for(int j = m;j >= 1;j--){
            so[i][j] = so[i][j + 1] + (a[i][j] == 'O');
        }
    }
    for(int i = 1;i <= m;i++){
        for(int j = n;j >= 1;j--){
            si[j][i] = si[j + 1][i] + (a[j][i] == 'I');
        }
    }
    ll res = 0;
    for(int i = 1;i <= n;++i){
        for(int j = 1;j <= m;j++){
            if(a[i][j] == 'J'){
                res += so[i][j + 1] * 1ll * si[i + 1][j];
            }
        }
    }
    cout << res;
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
    //cin >> t;
    while(t--) test();
}

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