Definitionintro
Inversion
Also called out-of-order pair.
A pair of positions i<j with a[i]>a[j]; the number of inversions measures disorder.
A pair of positions i<j with a[i]>a[j]; the number of inversions measures disorder.
About this page
The build computes these levels from the evidence in the repository. Each row says what the next level needs. Read what the levels mean.
| Ladder | Level | What the next level needs |
|---|---|---|
| Human proof | H0 no proof |
|
| Lean | L0 no Lean part |
|
| Visual | V0 none |
|
| Writing | W0 stub |
|
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