Submission #147403

#	Time	Username	Problem	Language	Result	Execution time	Memory
147403		reda	Bitaro the Brave (JOI19_ho_t1)	C++14	50 / 100	1018 ms	159392 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

#define MAX 3010
#define ll long long
using namespace std;

int n, m;

ll ans;
ll PO[MAX][MAX];
ll PI[MAX][MAX];
char v[MAX][MAX];
int main()
{
	cin >> n >> m ;

	for(int g = 1 ; g <= n ; g++)
		for(int h = 1 ; h <= m ; h++)
			cin >> v[g][h];

	for(int g = 1 ; g <= n ; g++)
		for(int h = m ; h > 0 ; h--)
			PO[g][h] = PO[g][h + 1] + (v[g][h] == 'O') ;

	for(int g = n ; g > 0 ; g--)
		for(int h = 1 ; h <= m ; h++)
			PI[g][h] = PI[g + 1][h] + (v[g][h] == 'I') ;

	for(int g = 1 ; g <= n ; g++)
		for(int h = 1 ; h <= m ; h++)
			if(v[g][h] == 'J')
				ans += PO[g][h] * PI[g][h];

cout << ans ;
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 0 / 50