Submission #1132984

#	Time	Username	Problem	Language	Result	Execution time	Memory
1132984		Agageldi	Chessboard (IZhO18_chessboard)	C++17	39 / 100	177 ms	23808 KiB

chessboard

/*
TASK: siuu
*/
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define N 400005
#define ff first
#define ss second
#define pb push_back
#define sz(s) (int)s.size()
#define rep(c, a, b) for(c = a; c <= b; c++)

ll n, t, a[3000][3000], b[3000][3000], answer = INT_MAX, k;

void solve1(int x,int bal) {
	bool tr = 0, tp = 0;
	if(!bal) tr = 1;
	ll ans = 0;
	for(int i = 1; i <= n; i++) {
		tp = tr;
		for(int j = 1; j <= n; j++) {
			if(tp == 0) b[i][j] = 0;
			else b[i][j] = 1;
			if(j % x == 0) tp = 1 - tp;
			if(a[i][j]!=b[i][j]) ans++;
		}
		if(i % x == 0) tr = 1 - tr;
	}
	answer = min(ans,answer);
}

int main () {
	ios::sync_with_stdio(0);cin.tie(0);
	cin >> n >> k;
	for(int i = 1; i <= k; i++) {
		int x1, x2,y1,y2;
		cin >> x1 >> y1 >> x2 >> y2;
		for(int j = x1; j <= x2; j++) {
			for(int l = y1; l <= y2; l++) {
				a[j][l] = 1;
			}
		}
	}
	for(int i = 1; i * i <= n; i++) {
		if(n % i == 0) {
			solve1(i, 1);
			solve1(i, 0);
			if(i != 1){
				solve1(n/i,1);
				solve1(n/i,0);
			}
		}
	}
	cout << answer << '\n';
}

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