摘要：
An undirected, connected graph of N nodes (labeled 0, 1, 2, ..., N-1) is given as graph. graph.length = N, and j != i is in the list graph[i] exactly 阅读全文
posted @ 2019-08-25 23:37
Grandyang
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Given a rooted binary tree, return the lowest common ancestor of its deepest leaves. Recall that: The node of a binary tree is a leaf if and only if i 阅读全文
posted @ 2019-08-22 22:39
Grandyang
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We are given a list of (axis aligned) . Each , where (x1, y1) are the coordinates of the bottom left corner, and (x2, y2) are the coordinates of the t 阅读全文
posted @ 2019-08-18 02:56
Grandyang
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Given an array A of integers, for each integer A[i] we need to choose either x = -K or x = K, and add x to A[i] (only once). After this process, we ha 阅读全文
posted @ 2019-08-15 23:29
Grandyang
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Strings and are similar (for some non negative integer ) if we can swap the positions of two letters in exactly times so that the resulting string equ 阅读全文
posted @ 2019-08-13 02:37
Grandyang
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On an N x N , the numbers from to are written boustrophedonically starting from the bottom left of the board, and alternating direction each row. For 阅读全文
posted @ 2019-08-12 21:16
Grandyang
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There are workers. The th worker has a and a minimum wage expectation . Now we want to hire exactly workers to form a paid group . When hiring a group 阅读全文
posted @ 2019-08-09 20:34
Grandyang
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Given an array of integers, for each integer we may choose any with ` K 这道题说是给了一个非负数的数组，和一个非负数K，说是数组中的每一个数字都可以加上 [ K, K] 范围内的任意一个数字，问新数组的最大值最小值之间的差值最小 阅读全文
posted @ 2019-08-07 22:20
Grandyang
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Return the length of the shortest, non-empty, contiguous subarray of A with sum at least K. If there is no non-empty subarray with sum at least K, ret 阅读全文
posted @ 2019-08-04 22:01
Grandyang
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Given an array of integers arr, find the sum of min(b), where b ranges over every (contiguous) subarray of arr. Since the answer may be large, return 阅读全文
posted @ 2019-07-30 22:53
Grandyang
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We are given a 2-dimensional grid. "." is an empty cell, "#" is a wall, "@" is the starting point, ("a", "b", ...) are keys, and ("A", "B", ...) are l 阅读全文
posted @ 2019-07-20 23:27
Grandyang
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Let's say a positive integer is a *superpalindrome* if it is a palindrome, and it is also the square of a palindrome. Now, given two positive integers 阅读全文
posted @ 2019-07-17 23:49
Grandyang
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A car travels from a starting position to a destination which is miles east of the starting position. Along the way, there are gas stations. Each repr 阅读全文
posted @ 2019-07-14 23:58
Grandyang
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Given an array of non negative integers, return an array consisting of all the even elements of , followed by all the odd elements of . You may return 阅读全文
posted @ 2019-07-11 23:32
Grandyang
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We run a preorder depth first search on the rootof a binary tree. At each node in this traversal, we output D dashes (where D is the depth of this nod 阅读全文
posted @ 2019-07-08 08:22
Grandyang
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A positive integer is magical if it is divisible by either A or B. Return the N th magical number. Since the answer may be very large, return it modul 阅读全文
posted @ 2019-07-07 23:49
Grandyang
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In a row of trees, the th tree produces fruit with type . You start at any tree of your choice, then repeatedly perform the following steps: 1. Add on 阅读全文
posted @ 2019-07-03 23:45
Grandyang
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There are G people in a gang, and a list of various crimes they could commit. The th crime generates a and requires gang members to participate. If a 阅读全文
posted @ 2019-06-29 22:52
Grandyang
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We are given , a length string of characters from the set . (These letters stand for "decreasing" and "increasing".) A valid permutation is a permutat 阅读全文
posted @ 2019-06-26 23:22
Grandyang
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Starting with an undirected graph (the "original graph") with nodes from to , subdivisions are made to some of the edges. The graph is given as follow 阅读全文
posted @ 2019-06-23 23:49
Grandyang
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We have a sorted set of digits D, a non-empty subset of {'1','2','3','4','5','6','7','8','9'}. (Note that '0' is not included.) Now, we write numbers 阅读全文
posted @ 2019-06-20 23:53
Grandyang
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You are given eggs, and you have access to a building with floors from to . Each egg is identical in function, and if an egg breaks, you cannot drop i 阅读全文
posted @ 2019-06-18 22:09
Grandyang
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Write a class which collects daily price quotes for some stock, and returns the span of that stock's price for the current day. The span of the stock' 阅读全文
posted @ 2019-06-15 23:27
Grandyang
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Given an array of integers , consider all non empty subsequences of . For any sequence S, let the width of S be the difference between the maximum and 阅读全文
posted @ 2019-06-13 23:02
Grandyang
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Write an iterator that iterates through a run length encoded sequence. The iterator is initialized by , where is a run length encoding of some sequenc 阅读全文
posted @ 2019-06-11 22:47
Grandyang
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A string of lowercase letters is given. Then, we may make any number of moves . In each move, we choose one of the first letters (starting from the le 阅读全文
posted @ 2019-06-09 23:40
Grandyang
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Implement , a class which simulates the operation of a stack like data structure. has two functions: , which pushes an integer onto the stack. , which 阅读全文
posted @ 2019-06-07 22:34
Grandyang
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We have an array A of non-negative integers. For every (contiguous) subarray B = [A[i], A[i+1], ..., A[j]] (with i <= j), we take the bitwise OR of al 阅读全文
posted @ 2019-06-05 23:15
Grandyang
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Given a tree, rearrange the tree in in-order so that the leftmost node in the tree is now the root of the tree, and every node has no left child and o 阅读全文
posted @ 2019-06-03 22:40
Grandyang
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An array is monotonic if it is either monotone increasing or monotone decreasing. An array is monotone increasing if for all . Return if and only if t 阅读全文
posted @ 2019-06-01 23:54
Grandyang
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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 阅读全文
posted @ 2019-05-30 22:34
Grandyang
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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 阅读全文
posted @ 2019-05-28 23:25
Grandyang
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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 阅读全文
posted @ 2019-05-26 23:28
Grandyang
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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 阅读全文
posted @ 2019-05-24 22:06
Grandyang
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Return any binary tree that matches the given preorder and postorder traversals. Values in the traversals and are distinct positive integers. Example 阅读全文
posted @ 2019-05-22 23:10
Grandyang
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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 阅读全文
posted @ 2019-05-20 19:45
Grandyang
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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 阅读全文
posted @ 2019-05-18 23:04
Grandyang
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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 阅读全文
posted @ 2019-05-16 20:42
Grandyang
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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 阅读全文
posted @ 2019-05-15 00:06
Grandyang
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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 阅读全文
posted @ 2019-05-12 23:48
Grandyang
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