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  1. #include <iostream>
  2. #include <cstdio>
  3. using namespace std;
  4.  
  5. int main() {
  6. 	long long int sum=0, total, n, a;
  7. 	scanf("%lld", &n);
  8. 	for(int i=1; i<n; i++) scanf("%lld", &a), sum+=a;
  9. 	total=(n*(n+1))/2;
  10. 	total-=sum;
  11. 	printf("%lld", total);
  12. 	return 0;
  13. }
Success #stdin #stdout 0s 3344KB
comments (?)
stdin 
10
3 8 10 1 7 9 6 5 2
stdout 
4
https://ideone.com/9l0AVw
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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