Submission #91830

#	Time	Username	Problem	Language	Result	Execution time	Memory
91830		emil_physmath	Chessboard (IZhO18_chessboard)	C++14	0 / 100	27 ms	2300 KiB

chessboard

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

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

bool IsWhite(long long, long long);
long long FindAns(long long n, long long k);
int main()
{
	long long n, k;
	cin>>n>>k;
	for (long long i=0; i<k; i++)
		scanf("%lld%lld%lld%lld", mini+i, minj+i, maxi+i, maxj+i);
	cout<<FindAns(n, k)<<'\n';

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

long long FindAns(long long n, long long k)
{
	long long shouldWhite=0, shouldBlack=(n*n)/2;
	for (long long i=0; i<k; i++)
    {
		if (IsWhite(maxi[i], maxj[i]))
			shouldWhite++;
      	else
          	shouldBlack--;
	}
	return min(1LL+shouldWhite+shouldBlack, n*n-(shouldWhite+shouldBlack));
}

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

Compilation message (stderr)

chessboard.cpp: In function 'int main()':
chessboard.cpp:16:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld%lld%lld%lld", 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