描述
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"
Note:
-10^7 <= num <= 10^7
解析
根据题意就是将十进制数字转换成七进制的数字字符串，正负号还要保持一致。思路很简单，如果是 0 直接返回 '0' ，否则在保证正负号相同的情况下，循环执行将 num 对 7 取模，并将 num 除 7 的操作，以得到七进制的每位数字。
解答
class Solution(object):
def convertToBase7(self, num):
"""
:type num: int
:rtype: str
"""
if num == 0:
return '0'
flag = True
if num<0:
flag = False
num = -num
r = ''
while num>0:
m = num % 7
r = str(m)+r
num = num//7
if not flag :
r = '-' + r
return r
运行结果
Runtime: 12 ms, faster than 98.00% of Python online submissions for Base 7.
Memory Usage: 13.4 MB, less than 42.00% of Python online submissions for Base 7.
原题链接：leetcode.com/problems/ba…
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