#906

Super Palindromes

hard · verified · 39.8% accepted · 376 likes · top 19%

Description

Let's say a positive integer is a super-palindrome if it is a palindrome, and it is also the square of a palindrome.

Given two positive integers left and right represented as strings, return the number of super-palindromes integers in the inclusive range [left, right].

Example 1:

Input: left = "4", right = "1000"

Output: 4

Explanation: 4, 9, 121, and 484 are superpalindromes.

Note that 676 is not a superpalindrome: 26 * 26 = 676, but 26 is not a palindrome.

Example 2:

Input: left = "1", right = "2"

Output: 1

Solution