correction union find

code/UnionFind.cc

@@ -2,4 +2,4 @@
 // path compression but no balancing
 int make(int *C, int n) { for(int i = 0; i < n; i++) C[i]=i; }
 int find(int *C, int x) { return (C[x]==x) ? x : C[x]=find(C, C[x]); }
-void unite(int *C, int x, int y) { C[find(x)] = find(y); }
+void unite(int *C, int x, int y) { C[find(C, x)] = find(C, y); }