Palindrome Number Total Accepted: 19369 Total Submissions: 66673My Submissions Determine whether an integer is a palindrome. Do this without extra space. 推断一个数整数是不是回文?比如121,1221就是回文,好吧,直接利用前面写过的[Leet Code]Reverse Integer--"%"你真的懂吗? 只是这里要考虑翻转后,数值…

String to Integer (atoi) Total Accepted: 15482 Total Submissions: 106043My Submissions Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yours…

[POJ 1159]Palindrome 近期各种题各种奇葩思路已经司空见惯了...又新出个滚动数组= = 该题另一点须要知道 最少须要补充的字母数 = 原序列S的长度 - S和S'的最长公共子串长度 然而窝原本并不知道--然后写出了一个奇葩dp做法 竟然比LCS快0.0 我的思路是从左往右遍历 每一个字符从右往左遍历到他的后一位置 dp数组标记当前位置往右相应匹配字符串左半边的最长序列长度的两倍(即为要删除序列长度) 每找到一个str[i]==str[j] 更新dp[j]为此时最长序列+2(左…

LeetCode第9题 Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1: Input: 121 Output: true Example 2: Input: -121 Output: false Explanation: From left to right, it reads -121. F…

[题目链接]:http://codeforces.com/contest/805/problem/D [题意] 给你一个字符串; 里面只包括a和b; 让你把里面的"ab"子串全都去掉; 方式是, 每次操作可以把"ab"替换成为"bba"; 直到整个字符串里面没有"ab"子串为止 [题解] 从ab开始 ab->bba 左边再加一个a的话 即aab 就相当于在bba左边加了一个a abba -> bbaba bbbba…

 Ctrl+shift+p,然后输入launch,点击第一个选项即可配置. 之后选择More即可 具体配置可修改为: { "version": "0.2.0", "configurations": [{ "name": "LaunchChrome", "type": "chrome", "request": "launch",…

[题目描述] Bike是一位机智的少年,非常喜欢数学.他受到142857的启发,发明了一种叫做“循环数”的数. 如你所见,142857是一个神奇的数字,因为它的所有循环排列能由它乘以1,2,...,6(1到它的长度)得到.循环排列意味着将该数的一些数位从尾部挪到前面.例如,12345的循环排列包括:12345,51234,45123,34512,23451.值得一提的是,允许出现前导零.因此4500123和0123450都是0012345的循环排列.你可以看到142857满足条件的原因.以下六个…

[题目链接] http://poj.org/problem?id=3974 [算法] 解法1 : 字符串哈希 我们可以分别考虑奇回文子串和偶回文子串,从前往后扫描字符串,然后二分答案,检验可以用哈希 时间复杂度 : O(TNlog(N)) 解法2 Manacher算法 这个算法可以在O(n)时间内求出最长回文子串,读者可以自行查阅资料,笔者不进行详细的介绍 两种方法的效率比对            显然,Manacher算法的复杂度是优于字符串哈希的,笔者的两份代码在POJ上的运行时间分别为48…

题目简述: Determine whether an integer is a palindrome. Do this without extra space. Some hints: Could negative integers be palindromes? (ie, -1) If you are thinking of converting the integer to string, note the restriction of using extra space. You coul…

Determine whether an integer is a palindrome. Do this without extra space. Some hints: Could negative integers be palindromes? (ie, -1) If you are thinking of converting the integer to string, note the restriction of using extra space. You could also…

Determine whether an integer is a palindrome. An integer is a palindrome when it reads the same backward as forward. Example 1:          Input: 121            Output: true Example 2:          Input: -121          Output: false                Explanat…

问题链接:https://leetcode.com/problems/palindrome-number/#/description Question:Determine whether an integer is a palindrome. Do this without extra space. 题意:判断一个数是否是回文数,不使用额外的空间. 分析:直接算出数字的倒序与该数字比较即可. 代码: C++版 class Solution { public: bool isPalindrome(…

Determine whether an integer is a palindrome. Do this without extra space. 判断一个整数是不是回文整数(例12321).不能使用多余的空间. Some hints: Could negative integers be palindromes? (ie, -1) If you are thinking of converting the integer to string, note the restriction of…

题目描述: 解题思路: 求回文数,并且要求不能使用额外的空间.思路很简单,算出x的倒置数reverse,比较reverse是否和x相等就行了. Java代码: public class LeetCode9 { public static void main(String[] args) { int x=1221; System.out.println(x+"是否是回文数:"+new Solution2().isPalindrome(x)); } } class Solution2 {…

思路:除和求余 取得首位和末尾 比较是否相等. public boolean isPalindrome(int x){ if(x<0){ return false; } int div=1; while(x/div>=10){ div*=10; } while(x!=0){ int left=x/div; int right=x%10; if(left!=right){ return false; } x=(x%div)/10;//去掉最高位和最低位 div/=100; } return tr…

这道题是LeetCode里的第9道题. 题目说的: 判断一个整数是否是回文数.回文数是指正序(从左向右)和倒序(从右向左)读都是一样的整数. 示例 1: 输入: 121 输出: true 示例 2: 输入: -121 输出: false 解释: 从左向右读, 为 -121 . 从右向左读, 为 121- .因此它不是一个回文数. 示例 3: 输入: 10 输出: false 解释: 从右向左读, 为 01 .因此它不是一个回文数. 进阶: 你能不将整数转为字符串来解决这个问题吗? 这道题虽然简单…

Balanced Number Problem Description A balanced number is a non-negative integer that can be balanced if a pivot is placed at some digit. More specifically, imagine each digit as a box with weight indicated by the digit. When a pivot is placed at some…

[链接] 我是链接,点我呀:) [题意] 光标一开始在p的位置 你可以用上下左右四个键位移动光标(左右)或者更改光标所在的字符(上下增加或减少ascill码) 问你最少要操作多少次才能使得字符串变成回文 [题解] 首先把字符串分成两个部分 1..n/2 和 n/2+1..n这两个部分 (如果n是奇数比较特殊,右半部分是n/2+2..n) 然后如果p落在右半部分那个区间的话 就让它做一下对称 到左半部分来 因为不可能从右边那个区间移动到左边那个区间的(跨越n到达1),那样做太不划算 这两个区间其实…

Problem Link: http://oj.leetcode.com/problems/palindrome-partitioning-ii/ We solve this problem by using Dynamic Programming. Optimal Sub-structure Assume a string S has the palindrome minimum cuts n, and S = W1 + W2 + ... + Wn where Wi is a palindro…

Problem Link: http://oj.leetcode.com/problems/palindrome-partitioning/ We solve this problem using Dynamic Programming. The problem holds the property of optimal sub-strcuture. Assume S is a string that can be partitioned into palindromes w1, ..., wn…

Problem link: http://oj.leetcode.com/problems/single-number-ii/ The problem seems like the Single Number. Suppose we have following (3m+1) numbers in the array A: x0, x1, x1, x1, ..., xm, xm, xm We are asked to find out the value of x0. However we ca…

题目: 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 number of bits in the code, print the sequence of gray code. A gray code sequence must begin with 0…

Description You are working for Macrohard company in data structures department. After failing your previous task about key insertion you were asked to write a new data structure that would be able to return quickly k-th order statistics in the array…

Prolbem link: http://oj.leetcode.com/problems/single-number/ This prolbem can be solved by using XOR(exclusive OR) operation. Let x, y, and z be any numbers, and XOR has following properties: x XOR 0 is itself, i.e. x XOR 0 = 0; x XOR x is 0, i.e. x…

Given a singly linked list, determine if it is a palindrome. 思路: 用快慢指针找到链表中点,反转后半部分链表,然后与前半部分进行匹配,随后将链表恢复原状(本题没有这个要求,具体情况具体对待). C++: /** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x),…

今天做了三道LeetCode上的简单题目,每道题都是用c++和Python两种语言写的.由于c++版的代码网上比較多.所以就仅仅分享一下Python的代码吧,刚学完Python的基本的语法,做做LeetCode的题目还是不错的,对以后找工作面试也有帮助! 刚開始就从AC率最高的入手吧! 1.Given an array of integers, every element appears twice except for one. Find that single one. Note: Your…

原题链接:Largest Number 题目描述: 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 number is 9534330. Note: The result may be very large, so you need to retur…

目的:使用 number 表单,让其只可输入数字. 问题:ios 可正常限制,Android 仍可输入  [ e | . |  - |  + ]   这4个字符.猜测这4个字符在数值中为科学记数.小数点.负号.正号. 代码: <input type="number" maxlength="255" min="0" placeholder="请输入" onKeypress="return (/[\d]/.test…

最近在项目中需要把各个字段的释义写到数据库中,该项目已经上线很长时间了,数据库中的字段没有上千也有上百个,要是一个项目一个项目打开然后再去找对应字段查看什么意思,估计要到明年过年了.由于项目中使用EntityFramework,本身这个项目只有手动设置字段注释的功能,Coder平时写代码的时候都懒得写注释,更别提能在配置数据库的时候将注释配置进去,所以如何在EF中自动将实体注释写入数据库,减轻Coder的压力(ru he tou lan)尤为重要.gitee地址:https://gitee.co…

模板题,,,模板打错查了1h+QAQ #include<cmath> #include<cstdio> #include<cstring> #include<algorithm> using namespace std; const int N = 1000003; int t1[N], t2[N], c[N], f[N][30]; void st(int *x, int *y, int *sa, int n, int m) { int i; for(i =…