题目：

题解：

CONV = "0123456789abcdef"
class Solution:def toHex(self, num: int) -> str:ans = []# 32位2进制数，转换成16进制 -> 4个一组，一共八组for _ in range(8):ans.append(num%16)num //= 16if not num:breakreturn "".join(CONV[n] for n in ans[::-1])