Grokking the Coding Interview: Patterns for Coding Questions
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Problem 3: Decimal to Binary Conversion (medium)
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Problem Statement

Given a positive integer n, write a function that returns its binary equivalent as a string. The function should not use any in-built binary conversion function.

Examples

Example 1:

Input: 2 Output: "10" Explanation: The binary equivalent of 2 is 10.

Example 2:

Input: 7 Output: "111" Explanation: The binary equivalent of 7 is 111.

Example 3:

Input: 18 Output: "10010" Explanation: The binary equivalent of 18 is 10010.

Constraints:

  • 1 <= n <= 10<sup>9</sup>

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