Submission #769268

#	Time	Username	Problem	Language	Result	Execution time	Memory
769268		NintsiChkhaidze	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	226 ms	88396 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define pb push_back
#define ll long long
#define s second
#define f first
#define left (node<<1),l,((l+r)>>1)
#define right ((node<<1)|1),((l+r)>>1) + 1,r
using namespace std;

const int N = 3000 + 5;

char a[N][N];
int O[N][N],I[N][N];

signed main() {
	ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);
	
	int n,m;
	cin>>n>>m;
	
	for (int i = 1; i <= n; i++){
		for (int j = 1; j <= m; j++){
			cin>>a[i][j];
			O[i][j] = O[i][j - 1];
			I[i][j] = I[i - 1][j];
			if (a[i][j] == 'O') O[i][j]++;
			if (a[i][j] == 'I') I[i][j]++;
		}
	}
	
	ll ans=0;
	for (int i = 1; i <= n; i++){
		for (int j = 1; j <= m; j++){
			if (a[i][j] != 'J') continue;
			int OO = O[i][m] - O[i][j];
			int II = I[n][j] - I[i][j];
			ans += OO * II;
		}
	}
	cout<<ans;
}

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