301. 删除无效的括号 https://leetcode.cn/problems/remove-invalid-parentheses
301. Remove Invalid Parentheses https://leetcode.com/problems/remove-invalid-parentheses
2850. 将石头分散到网格图的最少移动次数 https://leetcode.cn/problems/minimum-moves-to-spread-stones-over-grid
2850. Minimum Moves to Spread Stones Over Grid https://leetcode.com/problems/minimum-moves-to-spread-stones-over-grid
1723. 完成所有工作的最短时间 https://leetcode.cn/problems/find-minimum-time-to-finish-all-jobs
1723. Find Minimum Time to Finish All Jobs https://leetcode.com/problems/find-minimum-time-to-finish-all-jobs
2305. 公平分发饼干 https://leetcode.cn/problems/fair-distribution-of-cookies
2305. Fair Distribution of Cookies https://leetcode.com/problems/fair-distribution-of-cookies
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：
