77. 组合 (opens new window)

216. 组合总和 III (opens new window)

17. 电话号码的字母组合 (opens new window)

39. 组合总和 (opens new window) 40. 组合总和 II (opens new window) 131. 分割回文串 (opens new window) 93. 复原 IP 地址 (opens new window) 78. 子集 (opens new window) 90. 子集 II (opens new window) 491. 递增子序列 (opens new window) 重做 46.全排列 (opens new window) 47.全排列 II (opens new window)

332.重新安排行程 (opens new window)

51. N 皇后 (opens new window)

37. 解数独 (opens new window)

79. 单词搜索 (opens new window)

剑指 Offer 38. 字符串的排列 (opens new window)

面试题 08.12. 八皇后 (opens new window)

60. 排列序列 (opens new window)

140. 单词拆分 II (opens new window)