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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main(){
  5.     int N;
  6.     cin >> N;
  7.  
  8.     int arr[N];
  9.     for (int i = 0; i < N-1; i++) { 
  10.         cin >> arr[i];
  11.     }
  12.  
  13.     sort(arr, arr+N-1);
  14.  
  15.     for (int i = 0; i < N-1; i++) { 
  16.         if (arr[i] != i+1) {
  17.             cout << i+1 << endl;
  18.             break;
  19.         }
  20.     }
  21. }
  22.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/STJMPW
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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