晨曦丶s-CSDN博客

原创 389. Find the Difference

Given two strings s and t which consist of only lowercase letters.String t is generated by random shuffling string s and then add one more letter at a random position.Find the letter that was ad

2017-07-14 19:19:08 235

原创 344. Reverse String

Write a function that takes a string as input and returns the string reversed.Example:Given s = "hello", return "olleh".解题思路：很简单的逆转题class Solution {public: void my_swap(char *s, cha

2017-07-14 18:59:31 120

原创 463. Island Perimeter

You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontally/vertically (not diagonally). The grid is completely

2017-07-14 10:18:57 136

原创 557. Reverse Words in a String III

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.Example 1:Input: "Let's take LeetCode contest"

2017-07-14 09:55:04 206

原创 500. Keyboard Row

Given a List of words, return the words that can be typed using letters of alphabet on only one row's of American keyboard like the image below. Example 1:Input: ["Hello", "Alaska", "Dad

2017-07-14 09:45:31 157

原创 637. Average of Levels in Binary Tree

Given a non-empty binary tree, return the average value of the nodes on each level in the form of an array.Example 1:Input: 3 / \ 9 20 / \ 15 7Output: [3, 14.5, 11]Explanat

2017-07-12 10:54:22 229

原创 476. Number Complement

Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.Note:The given integer is guaranteed to fit within the range of

2017-07-12 08:25:47 124

原创 595. Big Countries

2017-07-11 12:16:30 333

原创 561. Array Partition I

Given an array of 2n integers, your task is to group these integers inton pairs of integer, say (a1, b1), (a2, b2), ..., (an, bn) which makes sum of min(ai, bi) for all i from 1 to n as large as pos

2017-07-11 09:18:42 115

原创 617. Merge Two Binary Trees

Given two binary trees and imagine that when you put one of them to cover the other, some nodes of the two trees are overlapped while the others are not.You need to merge them into a new binary tr

2017-07-11 08:51:43 231

原创 461. Hamming Distance

The Hamming distance between two integers is the number of positions at which the corresponding bits are different.Given two integers x and y, calculate the Hamming distance.Note:0 ≤ x, y 31.

2017-07-10 09:18:44 124

原创 1. Two Sum

Given an array of integers, return indices of the two numbers such that they add up to a specific target.You may assume that each input would have exactly one solution, and you may not use thesame

2017-07-10 08:42:01 157

原创 414. Third Maximum Number

Given a non-empty array of integers, return the third maximum number in this array. If it does not exist, return the maximum number. The time complexity must be in O(n).Example 1:Input: [3, 2,

2017-02-26 20:59:48 115

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