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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int ans(int arr[],int n,int k){
  4. 	unordered_set<int>m;
  5. 	for(int i=0;i<n;i++){
  6. 		int x=k-arr[i];
  7. 		if(m.find(x)!=m.end()){
  8. 			return 0;
  9. 		}
  10. 		else{
  11. 			m.insert(arr[i]);
  12. 		}
  13. 	}
  14. 	return -1;
  15.  
  16. }
  17. int main() {
  18. 	// your code goes here
  19. 	int arr[]={1,-2,1,0,5};
  20. 	int n=sizeof(arr)/sizeof(arr[0]);
  21. 	int k=0;
  22.  
  23. 	if(ans(arr,n,k)==-1){
  24. 		cout<<"false";
  25. 	}
  26. 	else{
  27. 		cout<<"true";
  28. 	}
  29. 	return 0;
  30. }
Success #stdin #stdout 0s 5332KB
comments (?)
stdin 
Standard input is empty
stdout 
false
https://ideone.com/WiSDtM
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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