Submission #2150674

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Source Code Expand

#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <iostream>
#include <map>
#define fo(i,a,b) for(int i=a;i<=b;i++)
#define fod(i,a,b) for(int i=a;i>=b;i--)
#define N 100005
using namespace std;
int a[N],b[N],n,m,d[N],c[N],n1,f[N];
map <int,int> h;
int getf(int k)
{
	if(f[k]==0||f[k]==k) return k;
	return (f[k]=getf(f[k])); 
}
int main()
{
	cin>>n;
	int v=0;
	fo(i,1,n) scanf("%d",&a[i]),v^=a[i],c[i]=a[i];
	a[n+1]=c[n+1]=v;
	bool pd=0;
	v=0;
	fo(i,1,n) scanf("%d",&b[i]),d[i]=b[i],v^=b[i];
	b[++n]=d[n]=v;
	sort(c+1,c+n+1),sort(d+1,d+n+1);
	n1=0;
	fo(i,1,n) 
	{
		if(c[i]!=d[i]) 
		{
			printf("-1\n");
			return 0;
		}
		if(h.count(c[i])==0) h[c[i]]=++n1;
		if(h.count(d[i])==0) h[d[i]]=++n1; 
	}
	int ans=0;
	fo(i,1,n) 
	{
		a[i]=h[a[i]],b[i]=h[b[i]];
		if(a[i]!=b[i]) 
		{
			if(i<n) ans++;
			int fx=getf(a[i]),fy=getf(b[i]);
			f[fx]=fy;
		}
	}
	if(ans==0) printf("0\n");
	else
	{
		fo(i,1,n1) if(getf(i)==i) ans++;
		printf("%d\n",ans-1);
	}
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:23:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  fo(i,1,n) scanf("%d",&a[i]),v^=a[i],c[i]=a[i];
                                               ^
./Main.cpp:27:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  fo(i,1,n) scanf("%d",&b[i]),d[i]=b[i],v^=b[i];
                                               ^

Judge Result