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332. Reconstruct Itinerary Medium 868 573 Favorite Share Given a list of airline tickets represented by pairs of departure and a...

329. Longest Increasing Path in a Matrix Hard 1158 21 Favorite Share Given an integer matrix, find the length of the longest inc...

Ref [1]  https://leetcode.com/problems/additive-number/ OJ

======================= ===================== Note:     1. differentiate the islands by "id"     2. "islands" re...

Ref [1] https://leetcode.com/problems/smallest-rectangle-enclosing-black-pixels/ [2]  https://leetcode.com/discuss/68246/c-java-pyth...

301. Remove Invalid Parentheses Hard 1678 71 Favorite Share Remove the minimum number of invalid parentheses in order to make t...

Ref [1]  https://leetcode.com/problems/closest-binary-search-tree-value-ii/ [2]  https://leetcode.com/discuss/55240/ac-clean-java-solu...

Question: Given a grid with 'o' and 'x'. Find minimum steps from top-left to   bottom-right without touching 'x'. ...

Ref [1]  https://leetcode.com/problems/graph-valid-tree/ OJ

Ref [1]  http://www.mitbbs.com/article_t/JobHunting/33010083.html MJ [2]  http://www.geeksforgeeks.org/print-bst-keys-in-the-given-rang...

Ref [1]  https://leetcode.com/problems/binary-tree-paths/ OJ

  211.   Design Add and Search Words Data Structure Medium 2413 107 Add to List Share Design a data structure that supports adding new words...