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全部文章 / leetcode （共18篇）

【LeetCode】226. Invert Binary Tree

Invert a binary tree. 4 / \ 2 7 / \ / \ 1 3 6 9 to 4 / \ 7 2 / \ / \ 9 6 3 1 思路：递归解决，倒置左子树，倒置右子树，交...

leetcode

2017-05-03

0 539

【Leetcode】167. Two Sum II - Input array is sorted

Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The functio...

leetcode

2017-05-03

0 508

【LeetCode】415. Add Strings,用string模拟加法

题目链接：https://leetcode.com/problems/add-strings/#/description 这个题的目的就是用string模拟整数加法 class Solution { public: string addStrings(string num1, strin...

leetcode string

2017-04-22

0 634

LeetCode 22. Generate Parentheses

Given n pairs of parentheses, write a function to generate all combinations of well-formed parentheses. For example, given n = 3, a solution set is: ...

leetcode

2017-02-24

0 508

LeetCode 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, calcu...

leetcode

2017-02-22

0 513

LeetCode 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 in...

leetcode

2017-02-22

0 487

LeetCode 520. Detect Capital

Given a word, you need to judge whether the usage of capitals in it is right or not. We define the usage of capitals in a word to be right when one o...

leetcode

2017-02-21

0 464

LeetCode 20. Valid Parentheses

Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must close in the...

leetcode

2017-02-21

0 515

LeetCode 70. Climbing Stairs

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 c...

2017-02-20

0 545

LeetCode 66. Plus One

Given a non-negative integer represented as a non-empty array of digits, plus one to the integer. You may assume the integer do not contain any leadi...

leetcode

2017-02-20

0 504