Submission #947617

#	Time	Username	Problem	Language	Result	Execution time	Memory
947617		Kongggwp	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	254 ms	154940 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;
#define int long long int
int n , m , ao[3005][3005] , ai[3005][3005] , sum;
char a[3005][3005] ;
int32_t main()
{
	ios_base::sync_with_stdio(0);cin.tie(0);
	cin >> n >> m;
	for(int i=0 ; i<n ; i++)
	{
		for(int j=0 ; j<m ; j++)
		{
			cin >> a[i][j];
			if(a[i][j]=='O')ao[i][j]++;
			if(a[i][j]=='I')ai[i][j]++;
		}
	}
	for(int i=n-1 ; i>=0 ; i--)for(int j=m-1 ; j>=0 ; j--)ao[i][j]+=ao[i][j+1] , ai[i][j]+=ai[i+1][j];
	for(int i=n-1 ; i>=0 ; i--)for(int j=m-1 ; j>=0 ; j--)if(a[i][j]=='J')sum += ao[i][j] * ai[i][j];
	cout << sum;
}

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