Submission #1121388

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121388		kasdo	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	482 ms	159324 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main()
{
    int n, m;
    cin>>n>>m;
    char a[n + 5][m + 5];
    
    int s1[n + 5][m + 5] = {}, s2[n + 5][m + 5] = {};
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=m; j++) cin>>a[i][j];
    }
    
    for(int i=n; i>=1; i--)
    {
        for(int j=m; j>=1; j--)
        {
            s1[i][j] = s1[i][j + 1] + (a[i][j] == 'O');
            s2[i][j] = s2[i + 1][j] + (a[i][j] == 'I');
        }
    }
    
    int ans = 0;
    for(int i=1; i<=n; i++)
    {
        for(int j=1; j<=m; j++)
        {
            if (a[i][j] == 'J') ans += (s1[i][j + 1] * s2[i + 1][j]);
        }
    }
    cout<<ans<<endl;

    return 0;
}

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