Submission #786769

#	Time	Username	Problem	Language	Result	Execution time	Memory
786769		winter0101	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	302 ms	115116 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
int a[3009][3009];
int b[3009][3009];
int c[3009][3009];
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    //freopen(".INP","r",stdin);
   // freopen(".OUT","w",stdout);
	int n,m;
	cin>>n>>m;
	for (int i=1;i<=n;i++){
		string s;
		cin>>s;
		for (int j=1;j<=m;j++){
			if (s[j-1]=='J')a[i][j]=1;
			else if (s[j-1]=='O')a[i][j]=2;
			else a[i][j]=3;
		}
	}
	for (int i=1;i<=n;i++){
		for (int j=1;j<=m;j++){
			b[i][j]=b[i][j-1];
			if (a[i][j]==2)b[i][j]++;
		}
	}
	for (int j=1;j<=m;j++){
		for (int i=1;i<=n;i++){
			c[i][j]=c[i-1][j];
			if (a[i][j]==3)c[i][j]++;
		}
	}
	long long ans=0;
	for (int i=1;i<=n;i++){
		for (int j=1;j<=m;j++){
			if (a[i][j]==1)ans=ans+(b[i][m]-b[i][j])*(c[n][j]-c[i][j]);
		}
	}
	cout<<ans;
}

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