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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int a, n, bin_sum=0;
  6. 	cin>>n;
  7. 	for(int i=1; i<n; i++) cin>>a, bin_sum^=a, bin_sum^=i;
  8. 	bin_sum^=n;
  9. 	cout<<bin_sum;
  10. 	return 0;
  11. }
Success #stdin #stdout 0s 3344KB
comments (?)
stdin 
10
3 8 10 1 7 9 6 5 2
stdout 
4
https://ideone.com/6Moq07
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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