https://leetcode.com/problems/sum-of-square-numbers/
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
代码：
class Solution {
public:
bool judgeSquareSum(int c) {
for(int i = 0; i <= sqrt(c); i ++) {
if(i * i == c) return true;
int num = c - i * i;
int t = sqrt(num);
if(t * t == num) return true;
}
return false;
}
};