Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used.
- All letters in hexadecimal (a-f) must be in lowercase.
- The hexadecimal string must not contain extra leading 0s. If the number is zero, it is represented by a single zero character '0'; otherwise, the first character in the hexadecimal string will not be the zero character.
- The given number is guaranteed to fit within the range of a 32-bit signed integer.
- You must not use any method provided by the library which converts/formats the number to hex directly.
Input: 26 Output: "1a"
Input: -1 Output: "ffffffff"
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