04 2019 档案
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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摘要：Given a positive integer , find and return the longest distance between two consecutive 1's in the binary representation of . If there aren't two cons
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摘要：Given a matrix , return the transpose of . The transpose of a matrix is the matrix flipped over it's main diagonal, switching the row and column indic
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摘要：Find the smallest prime palindrome greater than or equal to . Recall that a number is prime if it's only divisors are 1 and itself, and it is greater
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摘要：Given a binary tree rooted at , the depth of each node is the shortest distance to the root. A node is deepest if it has the largest depth possible am
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摘要：We are given a binary tree (with root node ), a node, and an integer value . Return a list of the values of all nodes that have a distance from the no
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摘要：We have a two dimensional matrix where each value is or . A move consists of choosing any row or column, and toggling each value in that row or column
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摘要：At a lemonade stand, each lemonade costs . Customers are standing in a queue to buy from you, and order one at a time (in the order specified by ). Ea
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摘要：Given two strings and of lowercase letters, return if and only if we can swap two letters in so that the result equals . Example 1: Example 2: Example
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摘要：There is a special square room with mirrors on each of the four walls. Except for the southwest corner, there are receptors on each of the remaining c
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