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# We know that a^2 + b^2 = c^2, and wish to use this to compute c
from math import sqrt, hypot
a = 3e154 # a^2 > 1e308
b = 4e154 # b^2 > 1e308
# with these, c = 5e154 which is less that 1e308
def longSideDirect():
    return sqrt(a**2 + b**2) # this will overflow
def longSideBuiltin():
    return hypot(a, b) # better to use built-in function