Leetcode 633. Sum of Square Numbers

Gary Chiang
Aug 25, 2021

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[medium]

Given a non-negative integer c, decide whether there're two integers a and b such that a2 + b2 = c.

Example 1:

Input: c = 5
Output: true
Explanation: 1 * 1 + 2 * 2 = 5

Example 2:

Input: c = 3
Output: false

Example 3:

Input: c = 4
Output: true

Example 4:

Input: c = 2
Output: true

Example 5:

Input: c = 1
Output: true

Constraints:

  • 0 <= c <= 231 - 1

[Java]

  1. use two pointer to closer the target number
  2. if we could not find a result for the nunmber c, return false

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Gary Chiang

CS new grad, 6 years experience related to supply chain management. Located in Bay area