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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin>>n;
  7.  
  8. 	vector<int>v(n);
  9. 	for(int i=0;i<n;i++){
  10. 		cin>>v[i];
  11. 	}
  12. 	unordered_set<int> set;
  13. 	int res=0;
  14. 	int cur_cnt=0;
  15. 	int r=0;
  16. 	for(int l=0;l<n;l++){
  17. 		while(r>l and !set.count(v[r])){
  18. 				++cur_cnt;
  19. 				set.insert(v[r]);
  20. 				r++;
  21.  
  22. 		}
  23. 		set.erase(v[l]);
  24.  
  25. 		res=max(cur_cnt,res);
  26. 	}
  27.  
  28.  
  29.  
  30. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/cA9w1e
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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