typed-dsa draws data-structure diagrams in Typst from declarative calls. Give it keys, values, or an operation, and it produces a laid-out diagram with consistent styling. It is built on top of CeTZ.

#import "@preview/typed-dsa:0.3.1": *

For the complete argument reference, including all nested style: and edge-customizations: options, see the documentation PDF.

Use it for lecture notes, problem sets, and explanations where the shape of a tree, heap, list, queue, stack, hash table, array, matrix, or graph matters more than hand-positioning every node.

Static Structures

Every builder returns an object. Show its .diagram field to render the static structure.

Trees

bst inserts keys in the given order. avl inserts keys in order too, but rebalances after each insertion.

#bst(50, 30, 70, 20, 40, 60, 80).diagram
#avl(10, 20, 30, 40, 50, 25).diagram

Heaps

min-heap and max-heap are array-backed binary heaps. Each input key is inserted and sifted up, then drawn as the complete binary tree represented by the heap array.

#min-heap(50, 30, 70, 20, 40, 60, 80).diagram
#max-heap(50, 30, 70, 20, 40, 60, 80).diagram

Linked Lists, Stack, And Queue

linked-list and doubly-linked-list can draw simple node chains or pointer cells. stack treats the first value as the top; queue treats the first value as the front. List objects support prepend, append or indexed insert, value delete, delete-at, and search.

#linked-list(3, 1, 4, 1, 5, head: true).diagram
#doubly-linked-list(3, 1, 4, 1, 5, head: true).diagram
#stack(9, 7, 2).diagram
#queue(3, 8, 5, 1).diagram

Skip Lists

skip-list draws a sorted list with express-lane levels above it. Pass values in strictly ascending order, without duplicates. A node’s height is assigned once — by decision-fn, deterministically from the value since Typst has no RNG — and never changes just because something else is inserted or deleted elsewhere. Objects support search, insert (level: auto or an explicit height), and delete. Searches return found and index, including for a missing value.

#let l = skip-list(1, 2, 3, 4, 5, 6)
#(l.search)(4).diagram
#(l.insert)(7).diagram

Graphs

graph draws from an adjacency dictionary. Automatic layout places nodes on a circle; layout: "linear" lines them up in a row (handy for topological orderings), with spacing set by gap:; layout: "manual" lets you define every position yourself. An edge entry can be just a neighbor label, or (neighbor, label) when you want an edge label such as a weight. Use node-labels: for outside annotations such as Dijkstra distances, ranks, or visit order.

#graph(("v1": ("v2", "v3"), "v2": ("v3",), "v3": ())).diagram

#graph(("A": (("B", [4]), ("C", [5])), "B": (("C", [11]),), "C": ())).diagram

#graph(
  ("S": (("A", [7]), ("B", [2])), "A": (), "B": ()),
  node-labels: (("S", [$0$]), ("A", [$7$]), ("B", [$2$])),
).diagram

#graph(
  ("v1": ("v2",), "v2": ("v3",), "v3": ("v4",), "v4": ()),
  layout: "linear",
  gap: 2,
).diagram

#graph(
  ("v1": ("v2", "v3"), "v2": ("v4",), "v3": ("v4",), "v4": ()),
  layout: "manual",
  positions: (
    "v1": (0, 0),
    "v2": (rel: "v1", offset: (1.4, 0.8)),
    "v3": (rel: "v1", offset: (1.4, -0.8)),
    "v4": (rel: "v2", offset: (1.4, -0.8)),
  ),
).diagram

Graph algorithms return full traces directly on the graph. Visited nodes are green, the current node is blue, queued/stacked nodes are yellow, and the edge being inspected is highlighted. dijkstra also labels every node with its current distance as d = ...; when it reaches a target, the final state highlights the shortest-path edges. A target is optional; omit it to traverse every reachable node.

#bfs(
  (
    "S": ("A", "B"),
    "A": ("T",),
    "B": ("T",),
    "T": (),
  ),
  "S",
  target: "T",
  columns: 3,
  style: graph-style(scale: 0.65),
).diagram
#dfs(adjacency, "S", target: "T").diagram
#dijkstra(weighted-adjacency, "S", target: "T").diagram

Arrays And Matrices

array-view and matrix draw compact grid-style cells. Use style.indices to draw array indices and cell-customizations: to restyle individual cells.

#array-view(
  4, 1, 7, 3,
  style: (indices: (enabled: true, weight: "bold")),
  cell-customizations: ((2, (fill: rgb("#D3F9D8"), stroke: 1pt + rgb("#2B8A3E"))),),
).diagram

#matrix(
  ((0, 1, 0), (1, 0, 1), (0, 1, 0)),
  cell-customizations: (((1, 2), (fill: rgb("#E7F5FF"), stroke: 1pt + rgb("#1971C2"))),),
).diagram

Hash Tables

hash-table accepts keys or (key, value) pairs and supports separate chaining or linear probing. Its insert, delete, and search methods return the same before/after operation steps as the other live structures.

#hash-table(1, 6, 11, size: 5, collision: "chaining").diagram
#hash-table(1, 6, 11, size: 5, collision: "linear").diagram

Sorting Algorithms

Sorting builders generate full teaching traces automatically. Each takes one array plus order: (quick-sort also takes pivot:), and returns .diagram, .steps, and .result, so you can show the whole algorithm or lay out selected steps yourself. Pass a styled array-view(...) instead of a bare array to carry its style through every step. merge-operation, bubble sort, insertion sort, and selection sort show cursor pointers by default; pass pointers: false to hide them. Pass labels: false to hide generated trace captions while keeping the arrays, highlights, indices, and pointers.

#merge-sort((38, 27, 43, 3, 9)).diagram
#merge-operation((1, 4, 7), (2, 3, 8)).diagram
#partition-step((7, 2, 9, 3, 6)).diagram
#quick-sort((8, 3, 1, 7, 0, 10, 2), pivot: "last").diagram
#bubble-sort((5, 1, 4, 2)).diagram

Operation Transitions

For operation diagrams, use the object notation. Call an operation field with parentheses, then show the returned step’s .diagram.

#let b = bst(50, 30, 70, 20, 40)
#let step = (b.insert)(45)
#step.diagram

The operation step also exposes .before, .after, .label, and .result. Use .result to chain the next operation.

#let a = avl(30, 10)
#let rotation = (a.insert)(20, rebalance: (
  enabled: true,
  all-steps: true,
))
#rotation.diagram

The AVL example above shows a double rotation as separate panels. BST and AVL objects support insert, delete, and search; heaps support insert and extract; stacks, queues, linked lists, and doubly linked lists expose their natural operations too.

Use sequence(..., columns:) to wrap multiple operation steps into rows instead of building one very long horizontal trace.

Use operation-sequence(initial, ..operations) when you want the package to apply and chain the operations too:

#operation-sequence(
  linked-list(2, 4),
  list => (list.prepend)(1),
  list => (list.insert)(3, index: 2),
  list => (list.search)(4),
  columns: 1,
).diagram

Styling

Every builder accepts style:. Use structure-specific helpers such as tree-style(...), stack-style(...), or graph-style(...) to get relevant named-argument suggestions from Typst editors, or pass a raw dictionary. Tip: if you forget a key like x-gap or box-gap, start typing inside the helper call and your editor can autocomplete the supported arguments. Common tree and graph keys include node-shape, node-radius, node-fill, node-stroke, edge-stroke, edge-arrow, and edge-pattern. Linear structures use box keys such as box-fill, box-stroke, ptr-fill, prev-ptr-fill, and next-ptr-fill. Nodes accept "rounded" and "capsule" shapes; cells accept them through box-shape. theme-preset provides default, dark, print, colorblind, and chalkboard presets.

#bst(50, 30, 70, 20, 40, style: tree-style(
  node-shape: "square",
  node-radius: 0.4,
  node-fill: rgb("#E3F2FD"),
  node-stroke: 1pt + rgb("#1565C0"),
  node-text: text-style(weight: "bold"),
)).diagram

Diff highlights are styleable too. new-style, path-style, remove-style, and rotate-style can be colors or dictionaries with fill, shape, stroke, node-radius, and text; node-mark-style(...) provides completion for tree/heap marks, while cell-mark-style(...) exposes only the options supported by linear cells. Set diff-colors: false to keep operation marks while drawing their fills like ordinary nodes.

Typography can be targeted by role with value-text, index-text, pointer-text, operation-text, edge-label-text, and algorithm-label-text; all inherit from the existing node-text or label-text defaults.

Worked Example: Last Stone Weight

This example solves LeetCode 1046 with a max-heap object. Each round extracts the two heaviest stones, inserts the difference when needed, and renders the heap state produced by the same algorithm.

License

MIT