Given a non-negative integer c, your task is to decide whether there‘re two integers a and b such that a2 + b2 = c.
Example 1:
Input: 5 Output: True Explanation: 1 * 1 + 2 * 2 = 5
Example 2:
Input: 3 Output: False
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[LeetCode] Sum of Square Numbers 平方数之和
原文：http://www.cnblogs.com/grandyang/p/7190506.html