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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <set>
  4. using namespace std;
  5.  
  6. bool g(int *t, int n)
  7. {
  8.     if ( n == 0 ) 
  9.        return false;
  10.     std::sort(t, t + n);
  11.     return (t[0] == 1) &&  // first number must be 1
  12.             (t[n-1] == n) && // last must be n
  13.             (std::set<int>(t, t+n).size() == n); // all must be unique
  14. }
  15.  
  16. int main()
  17. {
  18.    int arr[] = {1,2,3,4,5,6,7};
  19.    std::cout << g(arr, 7);
  20. }
Success #stdin #stdout 0s 3472KB
comments ()
stdin 
Standard input is empty
stdout 
1
https://ideone.com/B3oWSq
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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