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arikrak/long-leibniz.py

Created February 8, 2013 20:20
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long-leibniz.py
#adr2370's solution to Leibniz Challenge
#https://github.com/adr2370/HackerRankBackToSchool/blob/master/Leibniz.py
#193 characters
T=int(input())
for a in range(T):
n=int(input())
x=0.0
for i in range(n):
if i%2==0:
x+=1.0/(2*i+1)
else:
x-=1.0/(2*i+1)
print("%.15f"%x)
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