
Problem
Solution
Submissions
Convert a Number to Words
Certification: Intermediate Level
Accuracy: 30%
Submissions: 10
Points: 15
Write a Python function to convert a given integer into its word representation.
Example 1
- Input: num = 123
- Output: "one hundred twenty-three"
- Explanation:
- Step 1: Break down 123 into place values: 1 hundred and 23.
- Step 2: Convert 1 hundred to words: "one hundred".
- Step 3: Convert 23 to words: "twenty-three".
- Step 4: Combine the parts: "one hundred twenty-three".
- Step 5: Return the final word representation.
Example 2
- Input: num = 4567
- Output: "four thousand five hundred sixty-seven"
- Explanation:
- Step 1: Break down 4567 into place values: 4 thousand and 567.
- Step 2: Convert 4 thousand to words: "four thousand".
- Step 3: Break down 567 into place values: 5 hundred and 67.
- Step 4: Convert 5 hundred to words: "five hundred".
- Step 5: Convert 67 to words: "sixty-seven".
- Step 6: Combine the parts: "four thousand five hundred sixty-seven".
- Step 7: Return the final word representation.
Constraints
- 0 <= number <= 10^6
- Time Complexity: O(1)
- Space Complexity: O(1)
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Solution Hints
- Break the number into parts (thousands, hundreds, tens, units).
- Use dictionaries or lists to map numbers to their word equivalents.
- Handle edge cases like zero and numbers less than 20 separately.