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  1. #include <iostream>
  2. #include <vector>
  3. #include <unordered_set>
  4. using namespace std;
  5.  
  6.  
  7.  
  8. int main () {
  9.  
  10.     ios::sync_with_stdio(false);
  11.     cin.tie(nullptr);
  12.  
  13.     int n;
  14.     cin>>n;
  15.  
  16.     vector<int>nums(n);
  17.  
  18.  
  19.     for (int i = 0 ; i<n;i++) {
  20.     cin >> nums[i];
  21.     }
  22.  
  23.  
  24.     int left =0 , right = 0  , window_size=0;
  25.  
  26.  
  27.     unordered_set<int> seen;
  28.  
  29.     while (right<n) {
  30.  
  31.         if (seen.find(nums[right]) == seen.end() ) {
  32.             seen.insert( nums[right] );
  33.             window_size = max(window_size, right - left + 1);
  34.             right++;
  35.         }
  36.  
  37.         else {
  38.             seen.erase(nums[left]);
  39.             left++;
  40.  
  41.         }
  42.  
  43.  
  44.  
  45.     }
  46.  
  47.  
  48.         cout <<window_size;
  49.  
  50.  
  51.     return 0;
  52.  
  53.  
  54.  
  55. }
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/jOFv1F
language:
C++ (gcc 8.3)
created:
1 day ago
visibility:
public

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