Submission #533591

#	Time	Username	Problem	Language	Result	Execution time	Memory
533591		alvingogo	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	229 ms	89604 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#define AquA cin.tie(0);ios_base::sync_with_stdio(0);
#define fs first
#define sc second
#define cd complex<double>
#define p_q priority_queue
using namespace std;


int main(){
	AquA;
	int n,m;
	cin >> n >> m;
	long long ans=0;
	vector<string> v(n);
	for(int i=0;i<n;i++){
		cin >> v[i];
	}
	vector<vector<int> > p1(n,vector<int>(m)),p2(n,vector<int>(m));
	for(int i=0;i<n;i++){
		p1[i][m-1]=(v[i][m-1]=='O');
		for(int j=m-2;j>=0;j--){
			p1[i][j]=p1[i][j+1]+(v[i][j]=='O');
		}
	}
	for(int j=0;j<m;j++){
		p2[n-1][j]=(v[n-1][j]=='I');
		for(int i=n-2;i>=0;i--){
			p2[i][j]=p2[i+1][j]+(v[i][j]=='I');
		}
	}	
	for(int i=0;i<n;i++){
		for(int j=0;j<m;j++){
			if(v[i][j]=='J'){
				ans+=p1[i][j]*p2[i][j];
			}
		}
	}
	cout << ans << "\n";
	return 0;
}

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