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def count_inversion(sequence):
# Count inversions in a sequence of numbers.
return sum(
[
1
for i in range(len(sequence) - 1, -1, -1)
for j in range(i - 1, -1, -1)
if sequence[i] < sequence[j]
]
)
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"
KenMercusLai /
checkio
