摘要：Given an array of words and a length L, format the text such that each line has exactly L characters and is fully (left and right) justified.You shoul
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摘要：Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string. If the last word
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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). You are given a target va
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摘要：There are a total of n courses you have to take, labeled from 0 to n - 1.Some courses may have prerequisites, for example to take course 0 you have to...
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摘要：Reverse a singly linked list./** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) :...
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摘要：Given two strings s and t, determine if they are isomorphic.Two strings are isomorphic if the characters in s can be replaced to get t.All occurrences...
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摘要：Count the number of prime numbers less than a non-negative number, n.思路：寻找质数的方法class Solution {public: int countPrimes(int n) { int num = 0;...
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摘要：Remove all elements from a linked list of integers that have value val.ExampleGiven: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6Return: 1 --> 2 -->...
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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：Given a range [m, n] where 0 >= 1; n >>= 1; shift++; } return (m << shift); }};
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摘要：Given a 2d grid map of '1's (land) and '0's (water), count the number of islands. An island is surrounded by water and is formed by connecting adjacen...
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摘要：Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom.For exam...
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摘要：You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo...
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摘要：Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight).For example, the 32-bit i...
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摘要：Reverse bits of a given 32 bits unsigned integer.For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return
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摘要：Rotate an array of n elements to the right by k steps.For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4].Note:...
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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.Design an algorithm to find the maximum profit. You may complet...
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摘要：All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGAATTCCG". When studying DNA, it is sometimes useful to ...
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摘要：Given a list of non negative integers, arrange them such that they form the largest number.For example, given [3, 30, 34, 5, 9], the largest formed nu...
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摘要：Given an array of integers, every element appears three times except for one. Find that single one. Note:Your algorithm should have a linear runtime c
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