leetcode刷题

给定一个非负整数 c ，你要判断是否存在两个整数 a 和 b，使得 a2 + b2 = c 。

class Solution {
    public boolean judgeSquareSum(int c) {
        long a = 0;
        int b = (int)Math.sqrt(c);
        while(a <= b)
        {
            // a * a + b * b有可能超过int取值范围,需要用long
            if(a * a + b * b > c)
            {
                b--;
            }
            else if(a * a + b * b < c)
            {
                a++;
            }
            else
            {
                return true;
            }
        }
        return false;
    }
}

bool judgeSquareSum(int c){
    long a = 0;
        int b = (int)sqrt(c);
        while(a <= b)
        {
            // a * a + b * b有可能超过int取值范围,需要用long
            if(a * a + b * b > c)
            {
                b--;
            }
            else if(a * a + b * b < c)
            {
                a++;
            }
            else
            {
                return true;
            }
        }
        return false;
}