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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>v(n);
  10.     for(int &i:v)cin>>i;
  11.     int k;
  12.     cin>>k;
  13.     unordered_map<int,int>mp;
  14.     int mn=INT_MAX;
  15.     for(int i=0;i<n;i++){
  16.         int start= abs(v[i]-k);
  17.         if(mp.count(start)){
  18.             mn=min(mn,i-mp[start]+1);
  19.         }
  20.         if(!mp.count(v[i]))mp[v[i]]=i;
  21.     }
  22.     if(mn==INT_MAX)cout<<-1<<"\n";
  23.     else cout<<mn<<"\n";
  24. }
  25.  
  26. int main(){
  27.     ios_base::sync_with_stdio(false);
  28.     cin.tie(NULL);
  29.     solve();
  30.     return 0;
  31. }
Success #stdin #stdout 0.01s 5328KB
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-1
https://ideone.com/8H9GUU
language:
C++14 (gcc 8.3)
created:
11 hours ago
visibility:
public

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