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  1. #include <iostream>
  2. #include <map>
  3. using namespace std;
  4.  
  5. int main() {
  6.  
  7. 	int n;
  8. 	cin>>n;
  9.  
  10. 	int a[n];
  11. 	for(int i=0;i<n;i++)
  12. 	{
  13. 		cin>>a[i];
  14. 	}
  15.  
  16. 	map<int,int> Map;
  17. 	int L=0;
  18. 	int R=0;
  19.  
  20. 	int len=0;
  21. 	while(R < n)
  22. 	{
  23. 		if(Map.count(a[R]) > 0)
  24. 		{
  25. 			L = max(L,Map[a[R]]+1);
  26. 		}
  27.  
  28. 		Map[a[R]] = R;
  29. 		//cout<<"L="<<L<<" R="<<R<<" R-L+1="<<R-L+1<<endl;
  30. 		len = max(len,R-L+1);
  31. 		R++;
  32.  
  33. 	}
  34.  
  35. 	cout<<len<<endl;
  36.  
  37. 	return 0;
  38. }
Success #stdin #stdout 0s 5296KB
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https://ideone.com/exfjWQ
language:
C++14 (gcc 8.3)
created:
11 days ago
visibility:
public

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