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#!/usr/bin/env python3
import sys
import statistics
def pairs(l, n):
return zip(*[l[i::n] for i in range(n)])
# data comes in pairs:
# n - time for running the program with no input
# m - time for running it with the benchmark input
# we measure (m - n)
values = [ float(y) - float(x) for (x,y) in pairs(sys.stdin.readlines(),2)]
print("mean = %.4f, median = %.4f, stdev = %.4f" %
(statistics.mean(values), statistics.median(values),
statistics.stdev(values)))
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