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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.     int n;
  6.     cin >> n;
  7.     bool present[n+1];
  8.     for (int i = 0; i <= n; i++) {
  9.         present[i] = false;
  10.     }
  11.  
  12.     for (int i = 0; i < n; i++) {
  13.         int x;
  14.         cin >> x;
  15.         if (x <= n && x > 0) {
  16.             present[x] = true;
  17.         }
  18.     }
  19.  
  20.     for (int i = 1; i <= n; i++) {
  21.         if (!present[i]) {
  22.             cout << i;
  23.             break;
  24.         }
  25.     }
  26.  
  27.     return 0;
  28. }
  29.  
Success #stdin #stdout 0.01s 5312KB
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https://ideone.com/pG6fWR
language:
C++ (gcc 8.3)
created:
7 days ago
visibility:
public

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