Submission #555240

#	Time	Username	Problem	Language	Result	Execution time	Memory
555240		ngpin04	Chessboard (IZhO18_chessboard)	C++14	70 / 100	334 ms	6612 KiB

chessboard

#include <bits/stdc++.h>
#define fi first
#define se second
#define mp make_pair
#define TASK ""
#define ALL(x) (x).begin(), (x).end() 
using namespace std;
template <typename T1, typename T2> bool mini(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maxi(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}
const int N = 1e5 + 5; 
const int oo = 1e9;
const long long ooo = 1e18;
const int mod = 1e9 + 7; // 998244353;
const long double pi = acos(-1);

vector <int> p[N];

int x[N];
int y[N];
int u[N];
int v[N];
int n,k;

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	#ifdef ONLINE_JUDGE
	// freopen(TASK".inp","r",stdin);
	// freopen(TASK".out","w",stdout);
	#endif
	cin >> n >> k;
	if (n <= 100 && k == 0) {
		int ans = oo;
		for (int i = 1; i < n; i++) if (n % i == 0) {
			int d = (n / i);
			mini(ans, ((d * d) >> 1) * i * i);
			// cerr << d << " " << i << "\n";
		}
		cout << ans << "\n";
		return 0;
	}

	for (int i = 1; i <= k; i++)
		cin >> x[i] >> y[i] >> u[i] >> v[i];

	long long ans = ooo;
	for (int i = 1; i < n; i++) if (n % i == 0) 
	for (int v = 0; v < 2; v++) {
		int d = (n / i);
		long long res = ((1LL * d * d + v) >> 1) * i * i;
		// cerr << "split: " << i << " " << v << " " << res << "\n";
		for (int j = 1; j <= k; j++) {
			int c = ( ((x[j] - 1) / i + (y[j] - 1) / i) & 1) ^ v;
			// cerr << (x[j] - 1) << " " << (y[j] - 1) << " " << c << "\n";
			res += (c > 0) ? -1 : 1;
		}
		mini(ans, res);
	}

	cout << ans;
	return 0;
}

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