随笔分类 - LeetCode
摘要：A full binary tree is a binary tree where each node has exactly 0 or 2 children. Return a list of all possible full binary trees with nodes. Each elem
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摘要：You are given an array of strings. Two strings and are special equivalent if after any number of moves , S == T. A move consists of choosing two indic
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摘要：On a grid, we place some cubes. Each value represents a tower of cubes placed on top of grid cell . Return the total surface area of the resulting sha
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摘要：You have a list of and a , and you want to know which words in matches the pattern. A word matches the pattern if there exists a permutation of letter
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摘要：Return any binary tree that matches the given preorder and postorder traversals. Values in the traversals and are distinct positive integers. Example
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摘要：Alice and Bob have candy bars of different sizes: is the size of the th bar of candy that Alice has, and is the size of the th bar of candy that Bob h
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摘要：On a 2 dimensional grid with rows and columns, we start at facing east. Here, the north west corner of the grid is at the first row and column, and th
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摘要：We are given two sentences and . (A sentence is a string of space separated words. Each word consists only of lowercase letters.) A word is uncommon i
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摘要：On a grid, we place some cubes that are axis aligned with the x, y, and z axes. Each value represents a tower of cubes placed on top of grid cell . No
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摘要：The th person has weight , and each boat can carry a maximum weight of . Each boat carries at most 2 people at the same time, provided the sum of the
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摘要：An encoded string is given. To find and write the decoded string to a tape, the encoded string is read one character at a time and the following steps
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摘要：Alex and Lee play a game with piles of stones. There are an even number of piles arranged in a row, and each pile has a positive integer number of sto
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摘要：Given a non empty, singly linked list with head node , return a middle node of linked list. If there are two middle nodes, return the second middle no
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摘要：Koko loves to eat bananas. There are piles of bananas, the th pile has bananas. The guards have gone and will come back in hours. Koko can decide her
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摘要：A robot on an infinite grid starts at point (0, 0) and faces north. The robot can receive one of three possible types of commands: : turn left 90 degr
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摘要：In an array A containing only 0s and 1s, a *K-bit flip *consists of choosing a (contiguous) subarray of length K and simultaneously changing every 0 i
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摘要：A sequence is fibonacci like if: for all `i + 2 这道题给了我们一个数组，让找其中最长的斐波那契序列，既然是序列而非子数组，那么数字就不必挨着，但是顺序还是需要保持，题目中说了数组是严格递增的，其实博主认为这个条件可有可无的，反正又不能用二分搜索。关于斐
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摘要：Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a leaf value sequence. For example, in the given t
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摘要：Given two arrays and of equal size, the advantage of with respect to is the number of indices for which . Return any permutation of that maximizes its
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摘要：Starting with a positive integer , we reorder the digits in any order (including the original order) such that the leading digit is not zero. Return i
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