Update cf-468B.mdx

Author: envyaims

solutions/gold/cf-468B.mdx

@@ -35,13 +35,13 @@ We can treat each set as a graph with several connected components. For each $p_
 using namespace std;
 
 // BeginCodeSnip{DSU}
-class DisjointSets {
+class DSU {
   private:
 	vector<int> parents;
 	vector<int> sizes;
 
   public:
-	DisjointSets(int size) : parents(size), sizes(size, 1) {
+	DSU(int size) : parents(size), sizes(size, 1) {
 		for (int i = 0; i < size; i++) { parents[i] = i; }
 	}