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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	// max distance between same element
  6. 	vector<int> arr={1,1,2,2,2,1};
  7. 	unordered_map<int,int> ok;
  8. 	int dist=0;
  9. 	for(int i=0;i<arr.size();i++){
  10. 		if(ok.find(arr[i])!=ok.end()){
  11. 			dist=max(dist,i-ok[arr[i]]);
  12. 		}else{
  13. 				ok[arr[i]]=i;
  14. 		}
  15.  
  16. 	}
  17. 	cout<<dist;
  18. 	return 0;
  19. }
Success #stdin #stdout 0s 5316KB
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https://ideone.com/1jqsL0
language:
C++14 (gcc 8.3)
created:
8 hours ago
visibility:
public

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