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  1. #include <bits/stdc++.h>
  2. #define IOS ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
  3. using namespace std;
  4.  
  5. bool is_palindrome(vector<int> arr, int l , int r ) {
  6.     if (l >= r) return true;
  7.     if (arr[l] != arr[r]) return false;
  8.     return is_palindrome(arr, l + 1, r - 1);
  9. }
  10. void solve() {
  11.     vector<int> arr = {1, 2,3,2,1};
  12.     cout << is_palindrome(arr,0,arr.size()-1) << endl;
  13.     vector<int> arr2 = {1,2,3,1};
  14.     cout << is_palindrome(arr2,0,arr2.size()-1) << endl;
  15.     vector<int> arr3 = {1,2,2,1};
  16.     cout << is_palindrome(arr3,0,arr3.size()-1) << endl;
  17. }
  18.  
  19. int main() {
  20.     IOS;
  21.     solve();
  22.     return 0;
  23. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/gM00Lx
language:
C++14 (gcc 8.3)
created:
2 days ago
visibility:
public

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