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Java Solution for LeetCode algorithm problems, continually updating
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504\. Base 7
Easy
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