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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. main(){
  5.     int n,k,mn,sum=0;
  6.     cin>>n>>k;
  7.     mn=n;
  8.     vector<int>v(n);
  9.     for(auto &it:v)cin>>it;
  10.     unordered_map<int,int>mp;
  11.     for(int i=0;i<n;i++){
  12.         sum+=v[i];
  13.         if(sum==k){
  14.             mn=min(mn,i+1);
  15.         }
  16.         if(mp.find(sum-k)!=mp.end()){
  17.             mn=min(mn,i-mp[sum-k]);
  18.         }
  19.         mp[sum]=i;
  20.     }
  21.     if(mn==n&&sum>=k)cout<<n<<"\n";
  22.     else if(mn!=n)cout<<mn<<"\n";
  23.     else cout<<-1<<"\n";
  24. }
Success #stdin #stdout 0.01s 5308KB
comments (?)
stdin
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4 5
-8 -8 -3 8
stdout
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2
https://ideone.com/veOOgX
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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