Techniqueintro
Two-dimensional difference array
Also called 2D difference array, 2D Imos method.
Add a value to a rectangle with four point updates on a 2D difference grid, then recover the grid by 2D prefix sums.
Add a value to a rectangle with four point updates on a 2D difference grid, then recover the grid by 2D prefix sums.
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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