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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> a(n);
  9.     for(int i = 0; i < n; i++) 
  10.     cin >> a[i];
  11.  
  12.     int left = 0, right = n - 1;
  13.      while(left < right) {
  14.      int mid = (left + right) / 2;
  15.      if(mid % 2 == 1) 
  16.       mid--;
  17.  
  18.      if(a[mid] == a[mid + 1])
  19.      left = mid + 2;
  20.      else
  21.      right = mid;
  22.     }
  23.  
  24.     cout << a[left] << endl;
  25.     return 0;
  26. }
  27.  
Success #stdin #stdout 0.01s 5320KB
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https://ideone.com/9ExEh4
language:
C++ (gcc 8.3)
created:
3 hours ago
visibility:
public

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