题解 | 小红的圆构造

import math

x_p, y_p = map(int, input().split())

sum_xy = x_p + y_p
sqrt_part = math.sqrt(2 * x_p * y_p)

r1 = sum_xy - sqrt_part
r2 = sum_xy + sqrt_part

print("{0:.10f} {1:.104f}".format(r1, r2))

手算出结果之后，用代码套公式……