diff --git a/src/holt59/aoc/2024/day23.py b/src/holt59/aoc/2024/day23.py
index 07e201e..851ba89 100644
--- a/src/holt59/aoc/2024/day23.py
+++ b/src/holt59/aoc/2024/day23.py
@@ -1,7 +1,36 @@
+from collections import defaultdict
 from typing import Any, Iterator
 
 from ..base import BaseSolver
+from ..tools.graphs import iter_max_cliques
 
 
 class Solver(BaseSolver):
-    def solve(self, input: str) -> Iterator[Any]: ...
+    def solve(self, input: str) -> Iterator[Any]:
+        connections: dict[str, set[str]] = defaultdict(set)
+        for row in input.splitlines():
+            src, dst = row.split("-")
+            connections[src].add(dst)
+            connections[dst].add(src)
+
+        if self.files:
+            content = "graph G {\n"
+            for row in input.splitlines():
+                src, dst = row.split("-")
+                content += f"{src} -- {dst}\n"
+            content += "}"
+            self.files.create("graph.dot", content.encode(), False)
+
+        cliques: set[frozenset[str]] = set()
+
+        for node1, neighbors in connections.items():
+            for node2 in neighbors:
+                for node3 in connections[node2].intersection(neighbors):
+                    cliques.add(frozenset({node1, node2, node3}))
+
+        self.logger.info(f"found {len(cliques)} cliques of size 3")
+        yield sum(any(node.startswith("t") for node in clique) for clique in cliques)
+
+        # clique = max(nx.algorithms.clique.find_cliques(G), key=len)
+        clique = max(iter_max_cliques(connections), key=len)
+        yield ",".join(sorted(clique))
diff --git a/src/holt59/aoc/inputs/holt59/2024/day23.txt b/src/holt59/aoc/inputs/holt59/2024/day23.txt
index e69de29..6f6dd8f 100644
--- a/src/holt59/aoc/inputs/holt59/2024/day23.txt
+++ b/src/holt59/aoc/inputs/holt59/2024/day23.txt
@@ -0,0 +1,3380 @@
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diff --git a/src/holt59/aoc/inputs/tests/2024/day23.txt b/src/holt59/aoc/inputs/tests/2024/day23.txt
index e69de29..3d49766 100644
--- a/src/holt59/aoc/inputs/tests/2024/day23.txt
+++ b/src/holt59/aoc/inputs/tests/2024/day23.txt
@@ -0,0 +1,32 @@
+kh-tc
+qp-kh
+de-cg
+ka-co
+yn-aq
+qp-ub
+cg-tb
+vc-aq
+tb-ka
+wh-tc
+yn-cg
+kh-ub
+ta-co
+de-co
+tc-td
+tb-wq
+wh-td
+ta-ka
+td-qp
+aq-cg
+wq-ub
+ub-vc
+de-ta
+wq-aq
+wq-vc
+wh-yn
+ka-de
+kh-ta
+co-tc
+wh-qp
+tb-vc
+td-yn
diff --git a/src/holt59/aoc/tools/graphs.py b/src/holt59/aoc/tools/graphs.py
index e475025..35f8154 100644
--- a/src/holt59/aoc/tools/graphs.py
+++ b/src/holt59/aoc/tools/graphs.py
@@ -1,5 +1,13 @@
 import heapq
-from typing import Callable, Iterable, TypeVar, overload
+from typing import (
+    Callable,
+    Iterable,
+    Iterator,
+    Mapping,
+    TypeVar,
+    cast,
+    overload,
+)
 
 _Node = TypeVar("_Node")
 
@@ -116,3 +124,63 @@ def dijkstra(
         return preds
 
     return preds.get(target, None)
+
+
+def iter_max_cliques(
+    neighbors: Mapping[_Node, Iterable[_Node]], nodes: Iterable[_Node] | None = None
+) -> Iterator[list[_Node]]:
+    """
+    Find max cliques from the given set of neighbors containing the given set of nodes.
+
+    This is simply the networkx implementation with typing (and using a simple mapping
+    to avoid requiring networkx).
+    """
+    if len(neighbors) == 0:
+        return
+
+    # remove the node itself from the neighbors
+    adj = {u: {v for v in neighbors[u] if v != u} for u in neighbors}
+
+    # Initialize Q with the given nodes and subg, cand with their nbrs
+    Q: list[_Node | None] = list(nodes or [])
+    cand = set(neighbors)
+    for node in Q:
+        if node not in cand:
+            raise ValueError(f"The given `nodes` {nodes} do not form a clique")
+        cand &= adj[node]
+
+    if not cand:
+        yield cast(list[_Node], Q[:])
+        return
+
+    subg = cand.copy()
+    stack: list[tuple[set[_Node], set[_Node], set[_Node]]] = []
+    Q.append(None)
+
+    u = max(subg, key=lambda u: len(cand & adj[u]))
+    ext_u = cand - adj[u]
+
+    try:
+        while True:
+            if ext_u:
+                q = ext_u.pop()
+                cand.remove(q)
+                Q[-1] = q
+                adj_q = adj[q]
+                subg_q = subg & adj_q
+                if not subg_q:
+                    yield cast(list[_Node], Q[:])
+                else:
+                    cand_q = cand & adj_q
+                    if cand_q:
+                        stack.append((subg, cand, ext_u))
+                        Q.append(None)
+                        subg = subg_q
+                        cand = cand_q
+                        u = max(subg, key=lambda u: len(cand & adj[u]))
+                        ext_u = cand - adj[u]
+            else:
+                Q.pop()
+                subg, cand, ext_u = stack.pop()
+    except IndexError:
+        pass