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First solution in Uncategorized category for Count Inversions by danikmil
import copy
def count_inversion(sequence):
sequence_2 = copy.copy(sequence)
count = 0
for i in sequence:
for y in sequence_2[sequence.index(i):]:
if y < i:
count += 1
return count
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert count_inversion((1, 2, 5, 3, 4, 7, 6)) == 3, "Example"
assert count_inversion((0, 1, 2, 3)) == 0, "Sorted"
assert count_inversion((99, -99)) == 1, "Two numbers"
assert count_inversion((5, 3, 2, 1, 0)) == 10, "Reversed"
Oct. 19, 2014
