2843. Count Symmetric Integers

2843. Count Symmetric IntegersDifficulty: EasyTopics: Math, EnumerationYou are given two positive integers low and high.An integer x consisting of 2 * n digits is symmetric if the sum of the first n d...
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3272. Find the Count of Good Integers

3272. Find the Count of Good IntegersDifficulty: HardTopics: Hash Table, Math, Combinatorics, EnumerationYou are given two positive integers n and k.An integer x is called k-palindromic if: x is a pa...
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1922. Count Good Numbers

1922. Count Good NumbersDifficulty: MediumTopics: Math, RecursionA digit string is good if the digits (0-indexed) at even indices are even and the digits at odd indices are prime (2, 3, 5, or 7). For ...
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