Submission #529935

#	Time	Username	Problem	Language	Result	Execution time	Memory
529935		chenyan	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	164 ms	9236 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define all(x) x.begin(),x.end()
#define pb emplace_back
#define N 3010
char a[N][N];
int ans,cnt[2][N];
signed main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int n,m,i,j;
	cin>>n>>m;
	for(i=0;i<n;i++) for(j=0;j<m;j++)
		cin>>a[i][j];
	for(i=n-1;i>=0;i--) for(j=m-1;j>=0;j--){
		if(a[i][j]=='J') ans+=cnt[0][i]*cnt[1][j];
		if(a[i][j]=='O') cnt[0][i]++;
		if(a[i][j]=='I') cnt[1][j]++;
	}
	cout<<ans<<'\n';
}

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