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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. bool avail(int n,int arr[]){
  4. 	unordered_map<int,int>preHash;
  5. 	unordered_map<int,int>suffHash;
  6. 	preHash[arr[0]]++;
  7. 	suffHash[arr[n-1]]++;
  8. 	for(int i=1;i<n-1;i++){
  9. 		suffHash[arr[i+1]]++;
  10. 		if(preHash.find(arr[i]-1)!=preHash.end() && suffHash.find(arr[i]+1)!=suffHash.end()){
  11. 			return true;
  12. 		}
  13. 		preHash[arr[i]]++;
  14. 	}
  15. 	return false;
  16. }
  17.  
  18. int main() {
  19. 	// your code goes here
  20. 	int n;
  21. 	cin>>n;
  22. 	int arr[n];
  23. 	for(int i=0;i<n;i++){
  24. 		cin>>arr[i];
  25. 	}
  26. 	if(avail(n,arr)){
  27. 		cout<<"There exits triplets";
  28. 	}
  29. 	else{
  30. 		cout<<"There does exits triplets";
  31. 	}
  32. 	return 0;
  33. }
Success #stdin #stdout 0.01s 5288KB
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stdout
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There exits triplets
https://ideone.com/YUGBYD
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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