updated tcr

1 files changed, 27 insertions, 0 deletions

diff --git a/datastructures/unionFind2.cpp b/datastructures/unionFind2.cpp
new file mode 100644
index 0000000..225ecee
--- /dev/null
+++ b/datastructures/unionFind2.cpp
@@ -0,0 +1,27 @@
+vector<int> uf;
+
+init(int N) {
+	uf.assign(N,-1); //-1 indicates that every subset has size 1
+}
+
+int findSet(int i) {
+	if(uf[i] < 0) return i; //If uf[i] < 0 we have reach a root
+	uf[i] = findSet(uf[i]); //Path-Compression
+	return uf[i];
+}
+	
+void linkSets(int i, int j) {
+	//Take |uf[i]|, where i must be a root, to get the size 
+	//of the subset
+	if(abs(uf[i]) < abs(uf[j])) { //Union-by-size.
+		uf[j] += uf[i]; uf[i] = j; 
+	} else {
+		uf[i] += uf[j]; uf[j] = i; 
+	}
+}
+	
+void unionSets(int i, int j) {
+	if(findSet(i) != findSet(j)) linkSets(findSet(i),findSet(j));
+} 
+	
+