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AVL Tree: https://www.cs.uah.edu/~rcoleman/Common/CodeVault/Code/Code203_Tree.html Red-Black Tree: https://blog.naver.com/PostView.naver?blogId=leeinje66&logNo=221945641530 https://gist.github.com/aagontuk/38b4070911391dd2806f
AVL Tree: https://www.cs.uah.edu/~rcoleman/Common/CodeVault/Code/Code203_Tree.html Red-Black Tree: https://blog.naver.com/PostView.naver?blogId=leeinje66&logNo=221945641530 https://gist.github.com/aagontuk/38b4070911391dd2806f