随笔分类 - Great Questions
摘要：We have n jobs, where every job is scheduled to be done from startTime[i] to endTime[i], obtaining a profit of profit[i]. You're given the startTime,
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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-negative integer, you could swap two digits at most once to get the maximum valued number. Return the maximum valued number you could get.
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摘要：Given a robot cleaner in a room modeled as a grid. Each cell in the grid can be empty or blocked. The robot cleaner with 4 given APIs can move forward
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摘要：Given an array of positive integers arr (not necessarily distinct), return the lexicographically largest permutation that is smaller than arr, that ca
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摘要：Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character. Example 1: Input: S =
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摘要：In an N by N square grid, each cell is either empty (0) or blocked (1). A clear path from top-left to bottom-right has length k if and only if it is c
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摘要：Given an array A of non-negative integers, return the maximum sum of elements in two non-overlapping (contiguous) subarrays, which have lengths L and
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摘要：Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or
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摘要：You are given a list of non-negative integers, a1, a2, ..., an, and a target, S. Now you have 2 symbols + and -. For each integer, you should choose o
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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：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：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：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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摘要：Design and implement a data structure for Least Frequently Used (LFU) cache. It should support the following operations: getand put. get(key) - Get th
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摘要：Given a string, your task is to count how many palindromic substrings in this string. The substrings with different start indexes or end indexes are c
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摘要：Given a string s, find the longest palindromic subsequence's length in s. You may assume that the maximum length of s is 1000. Example 1:Input: "bbbab
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摘要：In the "100 game," two players take turns adding, to a running total, any integer from 1..10. The player who first causes the running total to reach o
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摘要：From: http://www.geeksforgeeks.org/find-number-of-triangles-possible/ Given an unsorted array of positive integers. Find the number of triangles that
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