Submission #48821

#	Time	Username	Problem	Language	Result	Execution time	Memory
48821		mrtsima22	Chessboard (IZhO18_chessboard)	C++17	16 / 100	80 ms	9924 KiB

chessboard

#include <bits/stdc++.h>
using namespace std;
#define lo long
const int lmax=1999999999;
const long long lmx=1999999999999999999;
long long n;
long long k;
long long ans=lmax,ansT,ansS;
int a[100003],b[100003],c[100003],d[100004];
int main(){std::ios::sync_with_stdio(false);
cin>>n>>k;
if(k==0LL){
ans=n*n/2;
for(long long j=2;j<=n/2+1;j++)
{
	if(n%j==0)
	{
		long long k=n/j;
		k=k*k;
		ans=min(ans,j*j/2*k);
	}
}
cout<<ans<<endl;
return 0;
}
ansT=ansS=0;
for(int i=0;i<k;i++)
{
	cin>>a[i]>>b[i]>>c[i]>>d[i];
	if(a[i]==c[i]&&b[i]==d[i])
	{
		if((a[i]+b[i])&1)
		{
			ansT++;
		}
		else
		{
			ansS++;
		}
	}	
}
k=n*n/2;
long long K=k;
if(n&1)K++;
ans=min(ansT+K-ansS,ansS+k-ansT);
cout<<ans<<endl;
}
/*

                   *         *
                  * *       * *
                 *   *     *   *
                *     *   *     *
               *       * *       *
               *        *        *
                *               *
                 *             *
                  *           *
                   *         *
                    *       *
                     *     *
                      *   *
                       * *
                        *



*/

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