Submission #1166551

#	Time	Username	Problem	Language	Result	Execution time	Memory
1166551		ByeWorld	Chessboard (IZhO18_chessboard)	C++20	70 / 100	147 ms	2016 KiB

chessboard

#include <bits/stdc++.h>
#define int long long
#define ll long long
#define pb push_back
#define fi first
#define se second
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
#define ld long double
using namespace std;
typedef pair<int,int> pii;
typedef pair<char,char> pcc;
typedef pair<pii,int> ipii;
typedef pair<pii,pii> ipiii;
const int MAXN = 2e5+10;
const int MAXA = 1e7+10;
const int INF = 1e18+10;
const int SQRT = 300;
const int LOG = 20;
const ld EPS = 1e-6;
const int MOD = 998244353;
int sum(int a, int b){ return (a+b)%MOD; }
void chsum(int &a, int b){ a = (a+b)%MOD; }
void chsub(int &a, int b){ a = (a+MOD-b)%MOD; }
int mul(int a, int b){ return (a*b)%MOD; }
void chmul(int &a, int b){ a = (a*b)%MOD; }
void chmn(int &a, int b){ a = min(a, b); }
void chmx(int &a, int b){ a = max(a, b); }

int n, m, x[MAXN], y[MAXN];
int ans = INF;

void cek(int siz){
	int bl = 0, wh = 0;
	for(int i=1; i<=m; i++){
		int row = x[i]/siz, col = y[i]/siz;
		if((row+col)%2 == 0) bl++;
		else wh++;
	}
	int blcell = ((n/siz)*(n/siz)+1)/2; blcell *= siz*siz;
	int whcell = (n/siz)*(n/siz)/2; whcell *= siz*siz;
	chmn(ans, blcell -bl+wh);
	chmn(ans, whcell -wh+bl);
}
signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin>>n>>m;
    for(int i=1; i<=m; i++){
    	int a,b; cin>>a>>b;
    	cin>>x[i]>>y[i]; x[i]--; y[i]--;
    }
    for(int siz=1; siz*siz<=n; siz++){
    	if(n%siz==0){
    		cek(siz); 
    		if(siz!=1 && siz*siz!=n) cek(n/siz);
    	}
    }
    cout << ans << '\n';
}

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