【练习】回溯算法经典习题 I

967. 连续差相同的数字 https://leetcode.cn/problems/numbers-with-same-consecutive-differences

980. 不同路径 III https://leetcode.cn/problems/unique-paths-iii

526. 优美的排列 https://leetcode.cn/problems/beautiful-arrangement

491. 递增子序列 https://leetcode.cn/problems/non-decreasing-subsequences

131. 分割回文串 https://leetcode.cn/problems/palindrome-partitioning

93. 复原 IP 地址 https://leetcode.cn/problems/restore-ip-addresses

89. 格雷编码 https://leetcode.cn/problems/gray-code

17. 电话号码的字母组合 https://leetcode.cn/problems/letter-combinations-of-a-phone-number

79. 单词搜索 https://leetcode.cn/problems/word-search

473. 火柴拼正方形 https://leetcode.cn/problems/matchsticks-to-square