字詞模式 | Easy | LeetCode#290. Word Pattern
子集問題 | Medium | LeetCode#90. Subsets II
子集問題 | Medium | LeetCode#78. Subsets
八皇后問題 | Hard | LeetCode#51. N-Queens
二元樹最大路徑總和 | Hard | LeetCode#124. Binary Tree Maximum Path Sum
勒索信 | Easy | LeetCode#383. Ransom Note
鏈節串列循環 | Easy | LeetCode#141. Linked List Cycle
查找字詞 | Medium | LeetCode#79. Word Search
電話號碼的字母組合 | Medium | LeetCode#17. Letter Combinations of a Phone Number
產生括號 | Medium | LeetCode#22. Generate Parentheses