平方数之和

/*
 * 思路：
 * 通过Java Stream生成一个从0到sqrt(c)的整数流
 * 检查是否存在一对整数a和b满足a^2 + b^2 = c
 */
import java.util.stream.IntStream;
 
public class Solution {
    public boolean judgeSquareSum(int c) {
        return IntStream.rangeClosed(0, (int) Math.sqrt(c))
                        .anyMatch(a -> {
                            int b = (int) Math.sqrt(c - a * a);
                            return a * a + b * b == c;
                        });
    }
}