Submission #1778796

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Source Code Expand

#include<bits/stdc++.h>
#define N 100005
using namespace std;
map<int,int>mp,s;
int n,a[N],b[N],cnt;
int f[N],siz[N],ss[N];
int find(int x)
{
    if(x==f[x])return x;
    return f[x]=find(f[x]);
}
void add(int a,int b)
{
    int aa=find(a),bb=find(b);
    if(aa!=bb)
    {
        f[aa]=bb;
        siz[bb]+=siz[aa];
        ss[bb]+=ss[aa];
    }ss[bb]++;
}
int main()
{
    scanf("%d",&n);int sum=0,fl=0;
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&a[i]);
        sum^=a[i];
        mp[a[i]]++;
    }
    //cout<<sum<<endl;
    for(int i=1;i<=n;i++)
    {
       // if(sum==a[i]&&mp[a[i]]==1)continue;
        if(s[a[i]]!=0)continue;
        s[a[i]]=++cnt;f[cnt]=cnt;siz[cnt]=mp[a[i]];
    }
    if(mp.find(sum)!=mp.end())mp[sum]++;
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&b[i]);
        if(b[i]==a[i])siz[find(s[a[i]])]--;
        if(mp.find(b[i])==mp.end())
        {
            if(!fl&&b[i]==sum)fl=1;
            else return puts("-1"),0;
        }
        else
        {
            //cout<<mp[b[i]]<<endl;
            if(!fl&&b[i]==sum)fl=1;
            else if(mp[b[i]]==0)return puts("-1"),0;
            if(mp[b[i]]!=0)mp[b[i]]--,add(s[b[i]],s[a[i]]);
        }
    }
    int ans=0;
    for(int i=1;i<=cnt;i++)
    {
        if(find(i)==i)
        {
            if(siz[i]==0)continue;
            ans+=siz[i]+1;
        }
    }
    if(fl)ans--;if(!ans)ans++;
    cout<<ans<<endl;
    return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:24:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&n);int sum=0,fl=0;
                   ^
./Main.cpp:27:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]);
                          ^
./Main.cpp:41:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&b[i]);
                          ^

Judge Result