Submission #945332

#	Time	Username	Problem	Language	Result	Execution time	Memory
945332		vako_p	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	263 ms	159184 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define ll long long

const int mxN = 3e3 + 5;
ll n,cntl[mxN][mxN],cntk[mxN][mxN],m,ans;
char ch[mxN][mxN];

int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);   
	cin >> n >> m;
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			cin >> ch[i][j];
		}
	}
	for(int i = 0; i < n; i++){
		for(int j = m - 1; j >= 0; j--){
			cntl[i][j] = cntl[i][j + 1] + (ch[i][j] == 'O');		
		}
	}
	for(int j = 0; j < m; j++){
		for(int i = n - 1; i >= 0; i--){
			cntk[i][j] = cntk[i + 1][j] + (ch[i][j] == 'I');
		}
	}
	for(int i = 0; i < n; i++){
		for(int j = 0; j < m; j++){
			if(ch[i][j] == 'J') ans += cntl[i][j] * cntk[i][j];
		}
	}
	cout << ans;
}

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