Friker/alg-vis — comment on commit ab46a1d13d74d362dddba0ff52ec83fbc9f98d40
File: src/algvis/unionfind/UnionFind.java line 47
By kuk0:

1.) ...because ranks is not initialized; add " = new ArrayList();" on line 16
2.) Integer.valueOf(0) ---> simply 0 (from [i don't know which] version, java can convert int to Integer automatically)