Submission #342687

#	Time	Username	Problem	Language	Result	Execution time	Memory
342687		koketsu	Chessboard (IZhO18_chessboard)	C++14	16 / 100	32 ms	492 KiB

chessboard

#include <bits/stdc++.h>
#define pb push_back
#define LL long long
#define Kultivator ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define int LL

using namespace std;

const LL Mxn = 1e6 + 7;
const LL Mod = 1e9 + 7;
const LL Inf = 1e14 + 7;

int N, K;

bool isprime(int n){
	if(n == 2) return true;
	for(int i = 2; i*i <= n; i++)
		if(n%i == 0) return false;
	return true;
}

bool Get(int x, int y, int d){
    return (x / d + y / d) % 2;
}

void Ans1(){
    int Ans = Mxn;
    for(int i = 1; i < N; i++){
        if(N % i == 0){
            Ans = min(Ans, (N * N) / (2 * i * i) * (i * i));
        }
    }
    cout << Ans;
}

void Ans2(){
	int cnt[2] = {0, 0};
	for(int i = 1; i <= K; i++){
		int x1, y1, x2, y2;
		cin >> x1 >> y1 >> x2 >> y2;
		for(int x = x1; x <= x2; x++)
		for(int y = y1; y <= y2; y++){
			//a[x][y] = 1;
			cnt[(x+y)%2]++;
		}
	}

	cout << min(N*N/2-cnt[1] + cnt[0], N*N/2+1-cnt[0] + cnt[1]);
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> N >> K;
    if(K == 0){
        Ans1();
    } else if(isprime(N)){
        Ans2();
    }
    //Ans3(N, K);
    return 0;
}

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