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Java Solution for LeetCode algorithm problems, continually updating

There is a newer version: 1.24

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