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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