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  1. #include <iostream>
  2. #include <cstdio>
  3.  
  4. using namespace std;
  5.  
  6. int a[100003]={0};
  7.  
  8. int main() {
  9. 	int n, b;
  10. 	a[0]=1;
  11. 	scanf("%d", &n);
  12. 	for(int i=1; i<n; i++) scanf("%d", &b), a[b]++;
  13. 	for(int i=0; i<=n; i++) if(a[i]==0) printf("%d", i);
  14. 	return 0;
  15. }
Success #stdin #stdout 0s 3732KB
comments (?)
stdin 
10
3 8 10 1 7 9 6 5 2
stdout 
4
https://ideone.com/R5D3Tw
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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