Submission #1003044

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003044		tamir1	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	340 ms	88572 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define ll long long
using namespace std;
int x,y,n,m,i,j,dp1[3005][3005],dp2[3005][3005];
ll ans;
char s[3005][3005];
int main(){
	cin >> n >> m;
	for(i=1;i<=n;i++){
		for(j=1;j<=m;j++){
			cin >> s[i][j];
		}
	}
	for(i=n;i>0;i--){
		for(j=m;j>0;j--){
			dp1[i][j]=dp1[i][j+1];
			dp2[i][j]=dp2[i+1][j];
			if(s[i][j]=='J') ans+=dp1[i][j]*dp2[i][j];
			if(s[i][j]=='O') dp1[i][j]++;
			if(s[i][j]=='I') dp2[i][j]++;
		}
	}
	cout << ans;
}

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