Submission #97402

#	Time	Username	Problem	Language	Result	Execution time	Memory
97402		MatheusLealV	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	296 ms	151636 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define N 3030
using namespace std;
typedef long long ll;

int n, m;

ll ans, I[N][N], O[N][N];

char mat[N][N];

int main()
{
	ios::sync_with_stdio(false); cin.tie(0);

	cin>>n>>m;

	for(int i = 1; i <= n; i++)
		for(int j = 1; j <= m; j++)
			cin>>mat[i][j];

	for(int i = n; i >= 1; i--)
	{
		for(int j = m; j >= 1; j--)
		{
			I[i][j] = I[i + 1][j] + (mat[i][j] == 'I');

			O[i][j] = O[i][j + 1] + (mat[i][j] == 'O');

			if(mat[i][j] == 'J') ans += I[i][j] * O[i][j];
		}
	}

	cout<<ans<<"\n";
}

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