2396. Strictly Palindromic Number #

Problem Statement #

An integer n is strictly palindromic if, for every base b between 2 and n - 2 (inclusive), the string representation of the integer n in base b is palindromic.

Given an integer n, return true if n is strictly palindromic and false otherwise.

A string is palindromic if it reads the same forward and backward.

Example 1:

Input: n = 9
Output: false
Explanation: In base 2: 9 = 1001 (base 2), which is palindromic.
In base 3: 9 = 100 (base 3), which is not palindromic.
Therefore, 9 is not strictly palindromic so we return false.
Note that in bases 4, 5, 6, and 7, n = 9 is also not palindromic.

Example 2:

Input: n = 4
Output: false
Explanation: We only consider base 2: 4 = 100 (base 2), which is not palindromic.
Therefore, we return false.

Constraints:

• 4 <= n <= 105

Solution: #

impl Solution {
    pub fn is_strictly_palindromic(n: i32) -> bool {
        let mut n = n;
        let mut rev = 0;

        while n > 0 {
            rev = rev * 10 + n % 10;
            n /= 10;
        }

        rev == n
    }
}

... #