leetcode564题目地址 Given an integer n, find the closest integer (not including itself), which is a palindrome. The 'closest' is defined as absolute difference minimized between two integers. Example 1: Input: "123" Output: "121" Note: The…

题目如下: 解题思路:既然是要求回文字符串,那么最终的输出结果就是对称的.要变成对称字符串,只要把处于对称位置上对应的两个字符中较大的那个变成较小的那个即可,假设n=1234,1和4对称所以把4变成1,2和3对称把3变成2,得到1221,看起来好像没问题了.可是如果n=1283,按照这个方法得到的结果是1221,而预期的结果应该是1331,所以需要考虑到进位和退位的问题.这就有点复杂了,简单点的方法也有,就是把进位和退位的所有情况都列举出来再做比较,得出差值最小的那个.例如n=1283,按照对称…

Given an integer n, find the closest integer (not including itself), which is a palindrome. The 'closest' is defined as absolute difference minimized between two integers. Example 1: Input: "123" Output: "121" Note: The input n is a po…

乘风破浪:LeetCode真题_016_3Sum Closest 一.前言      这一次,问题又升级了,寻找的是三个数之和最靠近的某个数,这是非常让人难以思考的,需要把三个数相加之后和最后给的目标进行比较,看看接近的程度,选择最接近的.不一定是等于目标.那么我们又该怎么做呢?? 二.3Sum Closest 2.1 问题 2.2 分析与解决 由上面的题意我们可以知道上一次的3sum所用的算法这边可能用不上了,需要进行改进.比如我们可以设想一个变量使得a+b+c≠target,但是a+b+c+…

Leetcode:1008. 先序遍历构造二叉树 Leetcode:1008. 先序遍历构造二叉树 思路 既然给了一个遍历结果让我们建树,那就是要需要前序中序建树咯~ 题目给的树是一颗BST树,说明中序历遍是有序的.最简单的想法自然是先排序再建树. 但是排序似乎是不需要的,因为BST左子树必小于右子树,于是我们只需要确定哪个点比根节点要大,就能说明右子树是从哪里开始的. 先序遍历无法确定的东西有一个被确定了,左子树的范围就很简单了啊. 于是不需要先排序,只要历遍一下就可以了.降低了一点复杂度.…

Given an integer n, find the closest integer (not including itself), which is a palindrome. The 'closest' is defined as absolute difference minimized between two integers. Example 1: Input: "123" Output: "121" Note: The input n is a po…

Given an integer n, find the closest integer (not including itself), which is a palindrome. The 'closest' is defined as absolute difference minimized between two integers. Example 1: Input: "123" Output: "121"  Note: The input n is a p…

C. The Closest Pair Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/312/problem/C Description Currently Tiny is learning Computational Geometry. When trying to solve a problem called "The Closest Pair Of Points In The Plane…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 16: 3Sum Closesthttps://oj.leetcode.com/problems/3sum-closest/ Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target.Return the sum…

一天一道LeetCode系列 (一)题目: Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution. For example,…