Submission #91703

#	Time	Username	Problem	Language	Result	Execution time	Memory
91703		emil_physmath	Chessboard (IZhO18_chessboard)	C++14	0 / 100	26 ms	1144 KiB

chessboard

#include <iostream>
#include <stdio.h>
using namespace std;
const int MAXK=100005;

int mini[MAXK], maxi[MAXK], minj[MAXK], maxj[MAXK];

int IsWhite(int, int);
int FindAns(int n, int k);
int main()
{
	//int len;
	//cin>>len;
	//while (true)
	//{
	//	int mini, minj, maxi, maxj;
	//	cin>>mini>>minj>>maxi>>maxj;
	//	cout<<"There are "<<NumWhite(mini, minj, maxi, maxj, len)
	//		<<" white cells in that subrectangle.\n";
	//	int realAns=0;
	//	for (int i=mini; i<=maxi; i++)
	//		for (int j=minj; j<=maxj; j++)
	//			if (((i+len-1)/len+(j+len-1)/len)%2==0)
	//				realAns++;
	//	if (NumWhite(mini, minj, maxi, maxj, len)==realAns)
	//		cout<<"OK\n";
	//	else
	//		cout<<"\aWA\n Should be "<<realAns<<".\n";
	//	cout<<endl;
	//}
	int n, k;
	cin>>n>>k;
	for (int i=0; i<k; i++)
		scanf("%d%d%d%d", mini+i, minj+i, maxi+i, maxj+i);
	cout<<FindAns(n, k)<<'\n';

	char I;
	cin >> I;
	return 0;
}

int FindAns(int n, int k)
{
	int shouldWhite=0, shouldBlack=0, isBlack=0;
	for (int i=0; i<k; i++)
	{
		if (IsWhite(maxi[i], maxj[i]))
			shouldWhite++;
		isBlack++;
	}
	shouldBlack=((n*n)/2)-(isBlack-shouldWhite);
	return min(shouldWhite+shouldBlack, n*n-(shouldWhite+shouldBlack));
}

int IsWhite(int i, int j)
{
	return ((i+j)%2==0);
}

Compilation message (stderr)

chessboard.cpp: In function 'int main()':
chessboard.cpp:34:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d%d%d", mini+i, minj+i, maxi+i, maxj+i);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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