Submission #1267228

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267228		cmiuc	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	302 ms	79760 KiB

joi2019_ho_t1

#include <iostream>

using namespace std;
char a[3005][3005];
int R[3005][3005], D[3005][3005];
int main(){
	int n, m;
	cin>>n>>m;

	for (int i=1;i<=n;i++){
		for (int j=1;j<=m;j++)
			cin>>a[i][j];
	}

	long long Ans = 0;
	for (int i=n;i>=1;i--){
		for (int j=m;j>=1;j--){
			R[i][j] = R[i][j+1] + (a[i][j] == 'O');
			D[i][j] = D[i+1][j] + (a[i][j] == 'I');
			Ans += R[i][j] * D[i][j] * (a[i][j] == 'J');
		}
	}
	cout<<Ans<<'\n';
}

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