Submission #991023

#	Time	Username	Problem	Language	Result	Execution time	Memory
991023		Muhammet	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	168 ms	159316 KiB

joi2019_ho_t1

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

#define N 3005
#define ll long long int
#define sz(x) (int)x.size()
#define ff first
#define ss second

ll T, n, a[N][N], b[N][N], m;

string s[N];

int main(){
	ios::sync_with_stdio(false); cin.tie(0);

	cin >> n >> m;
	for(int i = 1; i <= n; i++){
		cin >> s[i];
		s[i] = '#' + s[i];
	}
	for(int i = 1; i <= n; i++){
		for(int j = m; j >= 1; j--){
			a[i][j] = a[i][j+1];
			if(s[i][j] == 'O') a[i][j]++;
		}
	}
	for(int i = 1; i <= m; i++){
		for(int j = n; j >= 1; j--){
			b[j][i] = b[j+1][i];
			if(s[j][i] == 'I') b[j][i]++;
		}
	}
	ll ans = 0;
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= m; j++){
			if(s[i][j] == 'J') ans += (b[i][j] * a[i][j]);
		}
	}
	cout << ans << '\n';

	return 0;
}

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