From 88d04413ebaab961f849ac6ef3d6ff2179253d41 Mon Sep 17 00:00:00 2001
From: Gloria Mundi <gloria@gloria-mundi.eu>
Date: Sat, 7 Jun 2025 21:20:34 +0200
Subject: make union find a struct, remove kruskal

---
 content/graph/cycleCounting.cpp |  6 ++----
 content/graph/graph.tex         | 12 +++++++-----
 content/graph/kruskal.cpp       | 20 +++++++++++---------
 3 files changed, 20 insertions(+), 18 deletions(-)

(limited to 'content/graph')

diff --git a/content/graph/cycleCounting.cpp b/content/graph/cycleCounting.cpp
index deac71e..b7545d5 100644
--- a/content/graph/cycleCounting.cpp
+++ b/content/graph/cycleCounting.cpp
@@ -38,13 +38,11 @@ struct cycles {
 
 	bool isCycle(cycle cur) {// cycle must be constructed from base
 		if (cur.none()) return false;
-		init(ssize(adj)); // union find @\sourceref{datastructures/unionFind.cpp}@
+		UnionFind uf(ssize(adj)); // union find @\sourceref{datastructures/unionFind.cpp}@
 		for (int i = 0; i < ssize(edges); i++) {
 			if (cur[i]) {
 				cur[i] = false;
-				if (findSet(edges[i].first) ==
-				    findSet(edges[i].second)) break;
-				unionSets(edges[i].first, edges[i].second);
+				if (!uf.link(edges[i].first, edges[i].second)) break;
 		}}
 		return cur.none();
 	}
diff --git a/content/graph/graph.tex b/content/graph/graph.tex
index e46ad07..bf51d74 100644
--- a/content/graph/graph.tex
+++ b/content/graph/graph.tex
@@ -10,11 +10,13 @@
 	Für jeden Kreis $K$ im Graphen gilt:
 	Die schwerste Kante auf dem Kreis ist nicht Teil des minimalen Spannbaums.
 
-	\subsection{\textsc{Kruskal}}
-	\begin{methods}[ll]
-		berechnet den Minimalen Spannbaum & \runtime{\abs{E}\cdot\log(\abs{E})} \\
-	\end{methods}
-	\sourcecode{graph/kruskal.cpp}
+	\optional{
+		\subsubsection{\textsc{Kruskal}'s Algorithm \opthint}
+		\begin{methods}[ll]
+			berechnet den Minimalen Spannbaum & \runtime{\abs{E}\cdot\log(\abs{E})} \\
+		\end{methods}
+		\sourcecode{graph/kruskal.cpp}
+	}
 \end{algorithm}
 
 \begin{algorithm}{Heavy-Light Decomposition}
diff --git a/content/graph/kruskal.cpp b/content/graph/kruskal.cpp
index d42800d..98a2682 100644
--- a/content/graph/kruskal.cpp
+++ b/content/graph/kruskal.cpp
@@ -1,9 +1,11 @@
-ranges::sort(edges, less{});
-vector<Edge> mst;
-ll cost = 0;
-for (Edge& e : edges) {
-	if (findSet(e.from) != findSet(e.to)) {
-		unionSets(e.from, e.to);
-		mst.push_back(e);
-		cost += e.cost;
-}}
+ll kruskal(int n, vector<Edge> edges, vector<Edge> &mst) {
+	ranges::sort(edges, less{});
+	ll cost = 0;
+	UnionFind uf(n); // union find @\sourceref{datastructures/unionFind.cpp}@
+	for (Edge &e: edges) {
+		if (uf.link(e.from, e.to)) {
+			mst.push_back(e);
+			cost += e.cost;
+	}}
+	return cost;
+}
-- 
cgit v1.2.3