Submission #963939

#	Time	Username	Problem	Language	Result	Execution time	Memory
963939		raspy	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	371 ms	159056 KiB

joi2019_ho_t1

#include <iostream>

#define int long long

using namespace std;

char a[3005][3005];
int ko[3005][3005];
int ki[3005][3005];

int32_t main()
{
	int n, m;
	cin >> n >> m;
	for (int i = 0; i < n; i++)
		cin >> a[i];
	for (int i = n-1; i >= 0; i--)
		for (int j = 0; j < m; j++)
			ki[i][j] = ki[i+1][j]+(a[i][j] == 'I');
	for (int j = m-1; j >= 0; j--)
		for (int i = 0; i < n; i++)
			ko[i][j] = ko[i][j+1]+(a[i][j] == 'O');
	int rez = 0;
	for (int i = 0; i < n; i++)
		for (int j = 0; j < m; j++)
			if (a[i][j] == 'J')
				rez += ko[i][j]*ki[i][j];
	cout << rez << "\n";
	return 0;
}

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