1219. 黄金矿工 https://leetcode.cn/problems/path-with-maximum-gold
1849. 将字符串拆分为递减的连续值 https://leetcode.cn/problems/splitting-a-string-into-descending-consecutive-values
1593. 拆分字符串使唯一子字符串的数目最大 https://leetcode.cn/problems/split-a-string-into-the-max-number-of-unique-substrings
1079. 活字印刷 https://leetcode.cn/problems/letter-tile-possibilities
996. 正方形数组的数目 https://leetcode.cn/problems/number-of-squareful-arrays
784. 字母大小写全排列 https://leetcode.cn/problems/letter-case-permutation
前置知识
学习本章回溯算法习题之前，你必须掌握以下文章中所讲的思维方法：