504. Base 7
Given an integer, return its base 7 string representation.
Example 1:
Input: 100
Output: "202"
Example 2:
Input: -7
Output: "-10"
Note: The input will be in range of [-1e7, 1e7].
思路：辗转相除法。
转载于:https://www.cnblogs.com/vincent93/p/6686660.html
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