Submission #91706

#	Time	Username	Problem	Language	Result	Execution time	Memory
91706		emil_physmath	Chessboard (IZhO18_chessboard)	C++14	0 / 100	2060 ms	4232 KiB

chessboard

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

int mini[MAXK], maxi[MAXK], minj[MAXK], maxj[MAXK];
set<pair<int, int>>isBlack;

int IsWhite(int, int);
int FindAns(int n, int k);
int main()
{
	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);
		isBlack.insert(make_pair(mini[i], minj[i]));
	}
	cout<<FindAns(n, k)<<'\n';

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

int FindAns(int n, int k)
{
	int ans=0;
	for (int x=1; x<=n; x++)
		for (int y=1; y<=n; y++)
		{
			if (isBlack.find(make_pair(x, y))!=isBlack.end() && IsWhite(x, y))
				ans++;
			if (isBlack.find(make_pair(x, y))==isBlack.end() && !IsWhite(x, y))
				ans++;
		}
	return min(ans, n*n-ans);
	//int shouldWhite=0, shouldBlack=0, isBlack=0;
	//for (int i=0; i<k; i++)
	//	if (IsWhite(maxi[i], maxj[i]))
	//		shouldWhite++;
	//shouldBlack=((n*n)/2)-(k-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:18:8: 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