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  1. #include <iostream>
  2. #include <iomanip>
  3. #include <cmath>
  4.  
  5. bool g( const int a[], int n )
  6. {
  7.     int long long sum = 0;
  8.     int i = 0;
  9.     long long int target = (1<<n)-1;
  10.  
  11.     for ( ; i < n && a[i] > 0 ; i++ ) sum += 1<<a[i]-1;
  12.  
  13.     return i == n && sum == target;
  14. }   
  15.  
  16. int main() 
  17. {
  18.     const int N = 6;        
  19.     int t[N] = { 6, 2, 3, 4, 5, 1 }; 
  20.  
  21.     std::cout << std::boolalpha << g( t, N ) << std::endl;
  22. }
  23.  
Success #stdin #stdout 0s 3468KB
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stdin
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Standard input is empty
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true
https://ideone.com/DscXJH
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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