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Java Solution for LeetCode algorithm problems, continually updating

There is a newer version: 1.24

273\. Integer to English Words

Hard

Convert a non-negative integer `num` to its English words representation.

**Example 1:**

**Input:** num = 123

**Output:** "One Hundred Twenty Three" 

**Example 2:**

**Input:** num = 12345

**Output:** "Twelve Thousand Three Hundred Forty Five" 

**Example 3:**

**Input:** num = 1234567

**Output:** "One Million Two Hundred Thirty Four Thousand Five Hundred Sixty Seven" 

**Example 4:**

**Input:** num = 1234567891

**Output:** "One Billion Two Hundred Thirty Four Million Five Hundred Sixty Seven Thousand Eight Hundred Ninety One" 

**Constraints:**

*   0 <= num <= 2³¹ - 1