merge mzuenni changes

1 files changed, 7 insertions, 3 deletions

diff --git a/datastructures/unionFind.cpp b/datastructures/unionFind.cpp
index 35843cd..68eef86 100644
--- a/datastructures/unionFind.cpp
+++ b/datastructures/unionFind.cpp
@@ -1,5 +1,5 @@
 // unions[i] >= 0 => unions[i] =  parent
-// unions[i]  < 0 => unions[i] = -height
+// unions[i]  < 0 => unions[i] = -size
 vector<int> unions;
 
 void init(int n) { //Initialisieren
@@ -11,12 +11,16 @@ int findSet(int n) { // Pfadkompression
 	return unions[n] = findSet(unions[n]);
 }
 
-void linkSets(int a, int b) { // Union by rank.
+void linkSets(int a, int b) { // Union by size.
 	if (unions[b] > unions[a]) swap(a, b);
-	if (unions[b] == unions[a]) unions[b]--;
+	unions[b] += unions[a];
 	unions[a] = b;
 }
 
 void unionSets(int a, int b) { // Diese Funktion aufrufen.
 	if (findSet(a) != findSet(b)) linkSets(findSet(a), findSet(b));
 }
+
+int size(int a) {
+	return -unions[findSet(a)];
+}