633. Sum of Square Numbers
Math
Two Pointers
Binary Search
Given a non-negative integer c, decide whether there're two integers a and b such that a2 + b2 = c.
Examples
Example 1
Input: c = 5
Output: true
Explanation: 1 * 1 + 2 * 2 = 5
Example 2
Input: c = 3
Output: false