Given an integer num, return a string of its base 7 representation.
Example 1:
Input: num = 100
Output: "202"
Example 2:
Input: num = -7
Output: "-10"
Constraints:
-
-107 <= num <= 107
SOLUTION:
class Solution: def convertToBase7(self, num: int) -> str: if num == 0: return "0" sign = "" if num < 0: sign = "-" num *= -1 op = "" while num > 0: d = num % 7 num = num // 7 op = str(d) + op return sign + op 
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