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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int getMissingno(int a[],int n){
  4.  
  5.  int N=n+1;
  6.  int total=N*(N+1)/2;
  7. for(int i=0;i<n;i++)
  8. total-=a[i];
  9. return total;
  10. }
  11. int main() {
  12. 	// your code goes here
  13.     int	arr[]={1,2,4,5};
  14.     int	N=sizeof(arr)/sizeof(arr[0]);
  15. 	int miss=getMissingno( arr, N);
  16. 	cout<<miss;
  17. 	return 0;
  18. }
Success #stdin #stdout 0.01s 5380KB
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https://ideone.com/ylCoM3
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
public

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