Submission #734068

#	Time	Username	Problem	Language	Result	Execution time	Memory
734068		LCJLY	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	368 ms	159384 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;

#define int long long 
typedef pair<int,int>pii;

int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	int r,c;
	cin >> r >> c;
	
	char arr[r+5][c+5];
	
	for(int x=1;x<=r;x++){
		for(int y=1;y<=c;y++){
			cin >> arr[x][y];
		}
	}
	
	//compute psum 
	int horizontal[r+5][c+5];
	
	memset(horizontal,0,sizeof(horizontal));
	
	for(int x=1;x<=r;x++){
		for(int y=c;y>=1;y--){
			horizontal[x][y]=horizontal[x][y+1]+(arr[x][y]=='O');
		}
	}
	
	int vertical[r+5][c+5];
	
	memset(vertical,0,sizeof(vertical));
	
	for(int x=1;x<=c;x++){
		for(int y=r;y>=1;y--){
			vertical[y][x]=vertical[y+1][x]+(arr[y][x]=='I');
		}
	}
	
	int counter=0;
	for(int x=1;x<=r;x++){
		for(int y=1;y<=c;y++){
			if(arr[x][y]=='J'){
				counter+=horizontal[x][y]*vertical[x][y];
			}
		}
	}
	cout << counter;
}

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