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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. bool identical(vector<int>v,int k){
  5. 	map<int,int>m;
  6. 	for(int i=0;i<v.size();i++){
  7. 		if(m[v[i]]==0){
  8. 			m[v[i]]=i+1;
  9. 		}else{
  10. 			if((i+1-m[v[i]])<=k){
  11. 				return true;
  12. 			}else{
  13. 			  m[v[i]]=i+1;
  14. 			}
  15. 		}
  16. 	}
  17. 	return false;
  18. }
  19.  
  20. int main() {
  21. 	// your code goes here
  22. 	int n;cin>>n;
  23. 	vector<int>v(n);
  24. 	for(int i=0;i<n;i++)cin>>v[i];
  25. 	int k;cin>>k;
  26. 	if(identical(v,k)){
  27. 		cout<<"YES"<<endl;
  28. 	}else{
  29. 		cout<<"NO"<<endl;
  30. 	}
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 5320KB
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stdin
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5
3 2 4 3 1
3
stdout
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YES
https://ideone.com/cRoY5y
language:
C++14 (gcc 8.3)
created:
7 hours ago
visibility:
public

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