384. Symmetric Tree
EasyRecursion
Print YES if the tree is a mirror of itself around its centre, else NO.
Input format
Line 1: n (number of level-order entries) Line 2: the values in level order, -1 for a missing child
Output format
YES or NO
Example 1
Input
7 1 2 2 3 4 4 3
Output
YES
Example 2
Input
7 1 2 2 -1 3 -1 3
Output
NO
Constraints
1 ≤ nodes ≤ 10⁴
Read input from standard input and print the answer to standard output. Your code is judged against 4 test cases, most of them hidden.
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