Submission #913489

#	Time	Username	Problem	Language	Result	Execution time	Memory
913489		__newbie__	Bitaro the Brave (JOI19_ho_t1)	C++17	20 / 100	62 ms	107876 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

#define pb push_back
using namespace std;

int N  = 3e3 + 7;

typedef vector<int> vi;
typedef vector<vi> vii;
typedef pair<int, int> pii;
typedef vector<pii> vpii;

signed main()
{
	int h, w; cin >> h >> w;
	
	vii a(N, vi(N)), b(N, vi(N));
	
	vpii J(N);
	
	vii gr(N, vi(N));
	
	for (int i = 1; i <= h; i++)
	{
		string s; cin >> s; 
		s = "$" + s;
		
		for (int j = 1; j <= w; j++)
		{
			gr[i][j] = s[j];
			if (s[j] == 'J') J.pb({i, j});	
		}
	}
	
	for (int i = h; i >= 1; i--)
	{
		for (int j = w; j >= 1; j--)
		{
			a[i][j] = a[i][j + 1] + (gr[i][j] == 'O');	
			b[i][j] = b[i + 1][j] + (gr[i][j] == 'I');
		}
	}
	
	int ans = 0;
	
	for (auto [i, j] : J)
	{
		ans += a[i][j] * b[i][j];
	}
	
	cout << ans;
}

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