Submission #529128

#	Time	Username	Problem	Language	Result	Execution time	Memory
529128		Gurban	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	186 ms	88528 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;

using ll = long long;

const int maxn=3e3+5;
int n,m;
char c[maxn][maxn];
int dp[2][maxn][maxn];

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 >> c[i][j];
			dp[0][i][j] = dp[0][i - 1][j] + (c[i][j] == 'I');
			dp[1][i][j] = dp[1][i][j - 1] + (c[i][j] == 'O');
		}
	}

	ll ans = 0;
	for(int i = 1;i <= n;i++){
		for(int j = 1;j <= m;j++){
			if(c[i][j] != 'J') continue;
			// cout<<i<<' '<<j<<' '<<dp[0][n][j]<<' '<<dp[0][i][j]<<' '<<dp[1][i][m]<<' '<<dp[1][i][j]<<'\n';
			ans += (dp[0][n][j] - dp[0][i][j]) * (dp[1][i][m] - dp[1][i][j]);
		}
	}
	cout<<ans;
}

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