# -*- coding: utf-8 -*
import random
def fx(x,y):
a = -x*x -y*y + 1
return a
max = None
for i in range(1000000):
x = random.uniform(-1,1)
y = random.uniform(-1,1)
a = fx(x,y)
if max == None or max < a:
max = a
print(max)
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