随笔分类 - leetcode
摘要：Given an integer n, generate a square matrix filled with elements from 1 to n2 in spiral order.For example, Given n = 3,You should return the followin...
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摘要：Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its path.N...
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摘要：Given a linked list, swap every two adjacent nodes and return its head.For example, Given 1->2->3->4, you should return the list as 2->1->4->3.Your al...
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摘要：Given a collection of numbers, return all possible permutations.For example, [1,2,3] have the following permutations: [1,2,3], [1,3,2], [2,1,3], [2,3,...
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摘要：Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order red, ...
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摘要：Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists./** * Def...
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摘要：Implement the following operations of a queue using stacks.push(x) – Push element x to the back of queue. pop() – Removes the element from in front of...
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摘要：Say you have an array for which the ith element is the price of a given stock on day i.If you were only permitted to complete at most one transaction ...
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摘要：Write an algorithm to determine if a number is “happy”.A happy number is a number defined by the following process: Starting with any positive integer...
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摘要：The gray code is a binary numeral system where two successive values differ in only one bit.Given a non-negative integer n representing the total numb...
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摘要：Write a program to check whether a given number is an ugly number.Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For exam...
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摘要：Given a sorted linked list, delete all duplicates such that each element appear only once.For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3...
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摘要：Suppose a sorted array is rotated at some pivot unknown to you beforehand.(i.e., 0 1 2 4 5 6 7 might become 4 5 6 7 0 1 2).Find the minimum element.Yo...
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摘要：Find the contiguous subarray within an array (containing at least one number) which has the largest sum.For example, given the array [−2,1,−3,4,−1,2,1...
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摘要：You are climbing a stair case. It takes n steps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you cli...
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摘要：Design a stack that supports push, pop, top, and retrieving the minimum element in constant time.push(x) -- Push element x onto stack.pop() -- Removes...
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摘要：Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space?Subscribeto see which companies asked thi...
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摘要：Given an array containingndistinct numbers taken from0, 1, 2, ..., n, find the one that is missing from the array. For example,Givennums=[0, 1, 3]retu...
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Number of 1 BitsWrite a function that takes an unsigned integer and returns the number of ’1' bits i
摘要：Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as theHamming weight).For example, the 32-bit in...
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摘要：Related to questionExcel Sheet Column TitleGiven a column title as appear in an Excel sheet, return its corresponding column number.For example: A ...
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