Submission #307321

#	Time	Username	Problem	Language	Result	Execution time	Memory
307321		Temmie	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	390 ms	157720 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

typedef long long ll;

int main() {
	std::ios::sync_with_stdio(0);
	
	int h, w; std::cin >> h >> w;
	std::vector <std::vector <char>> g(3001, std::vector <char> (3001));
	std::vector <std::vector <ll>> a(3001, std::vector <ll> (3001, 0)), b(a);
	for (int i = 1; i <= h; i++)
		for (int j = 1; j <= w; j++) {
			std::cin >> g[i][j];
			a[i][j] = a[i][j - 1];
			b[i][j] = b[i - 1][j];
			a[i][j] += g[i][j] == 'O';
			b[i][j] += g[i][j] == 'I';
		}
	ll ans = 0;
	for (int i = 1; i <= h; i++)
		for (int j = 1; j <= w; j++)
			if (g[i][j] == 'J')
				ans += (a[i][w] - a[i][j]) * (b[h][j] - b[i][j]);
	std::cout << ans << "\n";
	
}

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