Easy

Quiz

#405 Convert a Number to Hexadecimal

APPROACH

Given a 32-bit signed integer num, return its hexadecimal representation as a lowercase string. Negative values use two's complement, and the result must contain no leading zeros (except for the value 0 itself).

You may not use any built-in hexadecimal conversion function.

Example 1:

Input: num = 26

Output: "1a"

Example 2:

Input: num = -1

Output: "ffffffff"

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What is the optimal approach for this problem?