Submission #167767

#	Time	Username	Problem	Language	Result	Execution time	Memory
167767		abil	Chessboard (IZhO18_chessboard)	C++14	8 / 100	2 ms	376 KiB

chessboard

#include <bits/stdc++.h>

#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define all(s) s.begin(),s.end()
//#define int long long

using namespace std;

const int N = (1e6 + 12);
const int mod = (1e9 + 7);
const int INF = (0x3f3f3f3f);

int ans = 1e9;
int n, k;
void calc(int div){
	int x = n / div, cnt = 0;
	if(x & 1){
		cnt += div * div * ((x + 1) / 2) * ((x + 1) / 2);
		cnt += div * div * (x / 2) * (x / 2);
	}
	else{
		cnt += div * div * (x / 2) * x;
	}
	ans = min({ans, cnt, n * n - cnt});
}
main()
{
	cin >> n >> k;
	ans = n * n / 2;
	for(int i = 2;i < n; i++){
		if(n % i == 0){
			calc(i);
		}
	}
	cout << ans;
}

Compilation message (stderr)

chessboard.cpp:29:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main()
      ^

• Subtask 1: 8 / 8
• Subtask 2: 0 / 8
• Subtask 3: 0 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 23
• Subtask 6: 0 / 30