def closest1(l): ## Exhaustive search for two closest values in a list ## O(n^2) m = sys.float_info.max for i in range(0,len(l)-2): for j in range(i+1,len(l)-1): test = abs(l[i]-l[j]) if test < m: i0 = l[i] i1 = l[j] m = test return (i0,i1) def closest2(l): ## Search for two closest values in a list by sorting first ## O(n*Log(n)) lcopy = l[:] lcopy.sort() m = sys.float_info.max for i in range(0,len(lcopy)-2): test = abs(lcopy[i]-lcopy[i+1]) if test < m: i0 = i m = test return (lcopy[i0],lcopy[i0+1]) if __name__ == "__main__": L1 = [ 15.1, -12.1, 5.4, 11.8, 17.4, 4.3, 6.9 ] (i0,i1) = closest1(L1) print "The answer via 'closest1' is ", i0, ",", i1 (i2,i3) = closest2(L1) print "The answer via 'closest2' is ", i2, ",", i3
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