Submission #1270367

#	Time	Username	Problem	Language	Result	Execution time	Memory
1270367		george_rubio	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	315 ms	150576 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define vi vector<int>
#define vb vector<bool>
#define vpi vector<pii>
#define MOD 1000000007
#define INF (int)2e18
#define mod(x) (((x)%MOD+MOD)%MOD)
#define MAX 200005


signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n, m;
    cin >> n >> m;

    vector<vi> a(n+1, vi(m+1));
    vector<vi> b(n+1, vi(m+1));
    vector<vector<char>> c(n+1, vector<char>(m+1));

    for(int i = 0; i < n; i++){
        for(int j = 0; j < m; j++){
            cin >> c[i][j];
            if(c[i][j] == 'O') a[i][j]++;
            else if(c[i][j] == 'I') b[i][j]++;
        }
    }
    for(int i = 0; i < n; i++){
        for(int j = m-2; j >= 0; j--){
            a[i][j] += a[i][j+1];
        }
    }
    for(int j = 0; j < m; j++){
        for(int i = n-2; i >= 0; i--){
            b[i][j] += b[i+1][j];
        }
    }
    int ans = 0;
    for(int i = 0; i < n; i++){
        for(int j = 0; j < m; j++){
            if(c[i][j] == 'J'){
                ans += a[i][j] * b[i][j];
            }
        }
    }
    cout << ans;
    
    return 0;
}

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