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  1. #include<bits/stdc++.h>
  2. #define T long long t;cin >>t;while(t--)
  3. #define fast ios::sync_with_stdio(false); cin.tie(0); cout.tie(0)
  4. #define ll long long
  5. #define lll unsigned long long
  6. using namespace std;
  7.  
  8. void Abady(){
  9.     int x; cin >> x;
  10.     int arr[x];
  11.     bool b=0;
  12.     int e=0,o=0;
  13.     for (int i=0;i<x;i++){
  14.         cin >> arr[i];
  15.         if (arr[i]&1^1){
  16.             e = __gcd(e,arr[i]);
  17.         }
  18.         else {
  19.             o = __gcd(o,arr[i]);
  20.         }
  21.     }
  22.     if (__gcd(e,o)==1) cout << x << endl;
  23.     else cout << -1 << endl;
  24. }
  25. int main(){
  26.     fast;
  27.     Abady();
  28. }
  29.  
  30.  
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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-1
https://ideone.com/IxnM2L
language:
C++ (gcc 8.3)
created:
12 days ago
visibility:
public

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