Submission #6068700

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
const int Maxn=100005,maxi=100000;
int fa[2*Maxn],cnt[2*Maxn];
int get_fa(int x)
{
	return x==fa[x]?fa[x]:fa[x]=get_fa(fa[x]);
}
void merge(int x,int y)
{
	int a=get_fa(x),b=get_fa(y);
	cnt[b]+=cnt[a];
	fa[a]=b;
}
int n;
long long tot,ans[2*Maxn][3];
int main()
{
	scanf("%d",&n);
	for(int i=1;i<=2*maxi;i++)
		fa[i]=i;
	for(int i=1;i<=n;i++)
	{
		int x,y;
		scanf("%d%d",&x,&y);
		merge(x,y+maxi);
		cnt[get_fa(x)]++;
	}
	for(int i=1;i<=maxi;i++)
		ans[get_fa(i)][1]++;
	for(int i=maxi+1;i<=2*maxi;i++)
		ans[get_fa(i)][2]++;
	for(int i=1;i<=2*maxi;i++)
		if(get_fa(i)==i) tot+=(ans[i][1]*ans[i][2]-cnt[i]);
	printf("%lld",tot);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:19:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
./Main.cpp:25:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&x,&y);
                      ^

Judge Result