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Day 6 #97

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@tech-cow

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@tech-cow

Week 2 | Day 6

Goal

DFS / Backtracking

Leetcode

  • 301 Remove Invalid Parentheses
  • 78. Subsets
  • 567. Permutation in String
  • 79. Word Search
    • Could Trie improves Speed?
  • 126 Word Ladder II
  • 721. Accounts Merge
  • 10. Regular Expression Matching
    • 变种 regex变成“+”,“*”(我的妈,上来我一看题就知道要挂...我用dp写的,但是天竺小哥说最好用recursion..)

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