Practicing LeetCode problems.

DFS:

94-Use DFS to inorder traversal tree.
104-DFS framework and BT.
111-?.
1379-?.
114-Use DFS to preorder traversal tree.
226-DFS framework.
1971-use DFS to solve graph path-finding problem.

BFS:

94-Use BFS to inorder traversal a BT.(write me)
104-BFS framework and BT.
111-
1379-(write me)
114-Use BFS to preorder traversal a BT.(write me)
226-BFS framework.
1971-use BFS to solve graph path-finding problem.(write me)

DP:

509-DP abstract.
121-?.
122-?.
684-?.

Linklist:

82-Use dummy node.
83-Remove node.
876-Use fast slow pointer.
878-Remove node.
328-Separate linklist to odd and even.
19-Use two ptr to count from the end of linklist.

Sorting:

69-Use Binary search to achieve sqrt(x).
977-(Binary search way)).
35-Using Binary search.
374-Using binary search.
704-Using Binary Search.
367-Using binary search.
875-Using binary search and ceil().

Heap:

506-know how to use Priority queue(Max heap).
23-priority_queue with class & bool operator().
347-priority_queue with pair.

Graph:

1791-konw what is a star graph.
1971-use DFS to solve graph path-finding problem.

String:

171-change the based carring.
6457-removing elements.
6439-??.

Greedy:

561-none.
942-none.
1323-none.
★406-?

Other:

118-knew how to use 2D vector.
88-knew how to merge two sort.
416-?.
441-?.