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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void solve(){
  5.     int n;
  6.     cin>>n;
  7.     vector<int>v(n);
  8.     for(int &i:v)cin>>i;
  9.     int k;
  10.     cin>>k;
  11.     unordered_map<int,int>mp;
  12.     int mn=INT_MAX;
  13.     for(int i=0;i<n;i++){
  14.         int start= abs(v[i]-k);
  15.         if(mp.count(start)){
  16.             mn=min(mn,i-mp[start]+1);
  17.         }
  18.         mp[v[i]]=i;
  19.     }
  20.     if(mn==INT_MAX)cout<<-1<<"\n";
  21.     else cout<<mn<<"\n";
  22. }
  23.  
  24. int main(){
  25.     ios_base::sync_with_stdio(false);
  26.     cin.tie(NULL);
  27.     solve();
  28.     return 0;
  29. }
Success #stdin #stdout 0.01s 5320KB
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Standard input is empty
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-1
https://ideone.com/Nc32Jy
language:
C++14 (gcc 8.3)
created:
11 hours ago
visibility:
public

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