随笔分类 - Uber
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：A permutation perm of n + 1 integers of all the integers in the range [0, n] can be represented as a string s of length n where: s[i] == 'I' if perm[i
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摘要：Given a n * n matrix grid of 0's and 1's only. We want to represent the grid with a Quad-Tree. Return the root of the Quad-Tree representing the grid.
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摘要：You are the manager of a basketball team. For the upcoming tournament, you want to choose the team with the highest overall score. The score of the te
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摘要：Given a 2D grid consists of 0s (land) and 1s (water). An island is a maximal 4-directionally connected group of 0s and a closed island is an island to
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摘要：There is a ball in a maze with empty spaces and walls. The ball can go through empty spaces by rolling up, down, left or right, but it won't stop roll
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摘要：A conveyor belt has packages that must be shipped from one port to another within D days. The i-th package on the conveyor belt has a weight of weight
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摘要：Given a 2D grid, each cell is either a wall 'W', an enemy 'E' or empty '0' (the number zero), return the maximum enemies you can kill using one bomb.T
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摘要：Equations are given in the format A / B = k, where A and B are variables represented as strings, and k is a real number (floating point number). Given
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摘要：Given a list of daily temperatures T, return a list such that, for each day in the input, tells you how many days you would have to wait until a warme
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摘要：A move consists of taking a point (x, y) and transforming it to either (x, x+y) or (x+y, y). Given a starting point (sx, sy) and a target point (tx, t
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摘要：Design a Snake game that is played on a device with screen size = width x height. Play the game online if you are not familiar with the game. The snak
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摘要：Given many words, words[i] has weight i. Design a class WordFilter that supports one function, WordFilter.f(String prefix, String suffix). It will ret
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摘要：Given a collection of intervals, find the minimum number of intervals you need to remove to make the rest of the intervals non-overlapping. Note: You
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摘要：Your are given an array of positive integers nums. Count and print the number of (contiguous) subarrays where the product of all the elements in the s
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摘要：You are given a string expression representing a Lisp-like expression to return the integer value of. The syntax for these expressions is given as fol
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摘要：Implement FreqStack, a class which simulates the operation of a stack-like data structure. FreqStack has two functions: push(int x), which pushes an i
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摘要：In a country popular for train travel, you have planned some train travelling one year in advance. The days of the year that you will travel is given
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摘要：Given an array of integers A sorted in non-decreasing order, return an array of the squares of each number, also in sorted non-decreasing order. Examp
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摘要：Given a string S, find the number of different non-empty palindromic subsequences in S, and return that number modulo 10^9 + 7. A subsequence of a str
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