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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long
  5.  
  6. void solve(){
  7.     int n;
  8.     cin>>n;
  9.     vector<int>a(n),b(n);
  10.     unordered_map<int,int>mp,mp2;
  11.     for(int &i:a){
  12.         cin>>i;
  13.         mp[i]++;
  14.     }
  15.     for(int &i:b){
  16.         cin>>i;
  17.         mp2[i]++;
  18.     }
  19.  
  20.     if(mp2!=mp){
  21.         cout<<-1<<"\n";
  22.         return;
  23.     }
  24.  
  25.     int count=0;
  26.     for(int i=0;i<n;i++){
  27.         if(a[i]==b[i])count++;
  28.     }
  29.     cout<<(count+1)/2<<"\n";
  30. }
  31.  
  32. int main(){
  33.     ios_base::sync_with_stdio(false);
  34.     cin.tie(NULL);
  35.     solve();
  36.     return 0;
  37. }
Success #stdin #stdout 0s 5324KB
comments (?)
stdin 
5
2 1 1 2 2
2 1 1 1 2
stdout 
-1
https://ideone.com/sPMt1V
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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