Palindrome Function As we all know,a palindrome number is the number which reads the same backward as forward,such as 666 or 747.Some numbers are not the palindrome numbers in decimal form,but in other base,they may become the palindrome number.Like…

普通的数位DP计算回文串个数 /* HDU 6156 - Palindrome Function [ 数位DP ] | 2017 中国大学生程序设计竞赛 - 网络选拔赛 2-36进制下回文串个数 */ #include <bits/stdc++.h> using namespace std; #define LL long long int t, L, R, l, r, base; int dig[40], tmp[40]; LL dp[40][40][40][2]; LL DFS(int p…

Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 256000/256000 K (Java/Others)Total Submission(s): 662    Accepted Submission(s): 351 Problem Description As we all know,a palindrome number is the number which reads the same backward as forward…

要求m-n内在l-r进制下的是回文数的总个数. dp[进制][从第j为开始][目前到达第k位] = 总的方案数 dfs枚举目前的到达的位置,这个数开始的位置,进制,前导零,限制条件,然后枚举的时候如果我现在是总的数的前一半,那么我就可以随意枚举,如果我已经到这个数的后一半了,那么我枚举的数字应该要满足和前面一半的这个位置对应的数,否则的话就是不满足条件的回文数,用这个数开始的位置为0来表示这个数不满足条件或者说我枚举的这个数全部都是零.然后算出这个区间内的回文数,要求sumf(i, j), 那么…

http://acm.hdu.edu.cn/showproblem.php?pid=6156 题意:$f(n,k)$表示判断n在k进制下是否是回文串,如果是,则返回k,如果不是,则返回1.现在要计算$\sum_{i=L}^{R}\sum_{j=l}^{r}f(i,j)$. 思路:因为我不会数位dp,所以我直接模拟做了一发,写得十分繁琐... 先是将数转换成k进制,然后去计算出它的前一半的数,只要小于该数那都是成立的 ,比如说现在前面的数为985,那么1~984的数都是满足的,绝对不会超. 思路大…

思路: 数位dp的操作是dfs+记忆化,我们dp开四维:位置,长度,进制,是否回文.然后每次暴搜记录下每个位置的数字是什么,搜到对称轴另一边需要检查是否符合回文. 终于把友谊赛的题目都补完了...没做出来的都是学过的,做出来的都是没学过骚操作过的...学以不致用... 代码: #include<cstdio> #include<set> #include<stack> #include<cstring> #include<algorithm> #…

一.题目 二.思路 1.这是很明显的数位DP: 2.和以往数位DP不同的是,这里带了个进制进来,而以往做是纯十进制下或者纯二进制下做操作.但是,不管多少进制,原理都是一样的: 3.这里有个小坑,题目中说大于10的数用A.B.C.…….Z表示,那都是骗人的.分解给定数字的每一位数后,得到每一位的就是在给定进制下的该位的权值,压根不需要在数字.字母之间转来转去,纯数字娱乐: 4.比较直观的想法是: (1)枚举给定范围内的每一个进制: (2)计算在b进制下的回文数个数,然后即可得出在b进制下的和: (…

http://acm.hdu.edu.cn/showproblem.php?pid=6156 [AC] #include<bits/stdc++.h> using namespace std; typedef long long ll; ; ]; int L,R,l,r; ll query(int x,int k) { ) ; ; int cp=x; while(cp) { num[cnt++]=cp%k; cp/=k; } ,tot=; ;i<cnt;i++) { tot+=base-…

[链接]http://acm.hdu.edu.cn/showproblem.php?pid=6156 [题意] 已知函数f(x, k),如果10进制数x在k进制下是个回文数,那么f(x, k)值为k,否则为1 现给出l, r, x, y, 求出∑∑f(i, j)  (l<=i<=r)  (x<=j<=y) [题解] 如果会求10进制的回文数个数问题的话,多少进制都能求了. 十进制L..R回文数 在这个程序的基础上把十进制改成base进制就好 剩下的不难写 [错的次数] 0 [反思]…

转载请注明出处:http://www.cnblogs.com/fangkm/p/4401075.html 前言 插件一直是浏览器的重要组成部分,丰富浏览器的运行能力,实现一些HTML+JS实现不了本地应用(比如音视频.文件操作等).早期广为熟知的是IE下的插件ActiveX,这是一项熟悉可能暴露年龄的技术,它基于COM规范,在IE占浏览器市场主流份额的时代,ActiveX可谓出尽了风头,但它并不是浏览器业内的插件标准.由网景发布的NPAPI长久以来是除了IE之外的其他浏览器共同支持的业内标准.A…

Largest palindrome product   A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99. Find the largest palindrome made from the product of two 3-digit numbers. 寻找能够分解为两个三位数乘…

Palindrome Function Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 256000/256000 K (Java/Others)Total Submission(s): 863    Accepted Submission(s): 476 Problem Description As we all know,a palindrome number is the number which reads the same…

Palindrome Function Time Limit: 8000/4000 MS (Java/Others)    Memory Limit: 256000/256000 K (Java/Others)Total Submission(s): 559    Accepted Submission(s): 299 Problem Description As we all know,a palindrome number is the number which reads the same…

Friend-Graph Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 6514    Accepted Submission(s): 1610 Problem Description It is well known that small groups are not conducive of the development of…

现在我们在工作中,在开发中都会或多或少的用到图表统计数据显示给用户.通过图表可以很直观的,直接的将数据呈现出来.这里我就介绍说一下利用百度开源的echarts图表技术实现的具体功能. 1.对于不太理解echarts是个怎样技术的开发者来说,可以到echarts官网进行学习了解,官网有详细的API文档和实例供大家参考学习. 2.以下是我在工作中实现整理出来的实例源码: 公用的支持js文件 echarts.js.echarts.min.js,还有其他的图表需要支持的js文件也可以到官网下载 echa…

#include<iostream> #include<cstring> #include<cstdio> /* 题意:计算f(n) = -1 + 2 -3 +4.....+(-1)^n *n的值 思路:偶数和 - 奇数和(或者用等差数列计算化简得到结果) */ #include<algorithm> #define N 10000 using namespace std; int main(){ long long n; cin>>n; ==)…

http://www.geeksforgeeks.org/function-to-check-if-a-singly-linked-list-is-palindrome/ 这里的reverse可以reverse整个list,这样空间需求就是O(n),不如这个网页写的O(1)的方法 #include <iostream> #include <vector> #include <algorithm> #include <queue> #include <s…

Determine whether an integer is a palindrome. Do this without extra space. public class Solution { public boolean isPalindrome(int x) { || (x != && x % == )) // the last digit is 0 return false; ; while (x > sum) { sum = sum * + x % ; x = x / ;…

Reverse Integer Reverse digits of an integer. Example1: x =  123, return  321 Example2: x = -123, return -321 click to show spoilers. Have you thought about this? Here are some good questions to ask before coding. Bonus points for you if you have alr…

2.7 Implement a function to check if a linked list is a palindrome. LeetCode上的原题,参见我之前的博客Palindrome Linked List 回文链表.…

131. Palindrome Partitioning Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s. For example, given s = "aab",Return [ ["aa","b"], ["…

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example,"A man, a plan, a canal: Panama" is a palindrome."race a car" is not a palindrome. Note:Have you consider that th…

Problem: Implement a function to check if a singly linked list is a palindrome. 思路: 最简单的方法是 Reverse and compare. 另外一种非常经典的办法是用 Recursive 的思路,把一个list看成这种形式: 0 ( 1 ( 2 ( 3 ) 2 ) 1 ) 0 0 ( 1 ( 2 ( 3 3 ) 2 ) 1 ) 0 CC150里面给出的Code,非常简洁,贴在下面: length == 1 对应…

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example, "A man, a plan, a canal: Panama" is a palindrome. "race a car" is not a palindrome. Note: Have you consider that…

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example, "A man, a plan, a canal: Panama" is a palindrome. "race a car" is not a palindrome. Note: Have you consider that…

H. Special Palindrome time limit per test:1 second memory limit per test:64 megabytes input:standard input output:standard output A sequence of positive and non-zero integers called palindromic if it can be read the same forward and backward, for exa…

[题目描述] Implement a function to check if a linked list is a palindrome. 设计一种方式检查一个链表是否为回文链表. [题目链接] www.lintcode.com/en/problem/palindrome-linked-list/ [题目解析] 假设一个链表是回文,那么把链表分割为1-n/2,n/2+1-n两个部分,这两个部分肯定是相同的(把第二部分顺序逆转过来或者逆转第一部分).所以如果我们能把任何一个部分的链表顺序逆转过来…

Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases. For example, "A man, a plan, a canal: Panama" is a palindrome. "race a car" is not a palindrome. Note: Have you consider that…

Determine whether an integer is a palindrome. Do this without extra space. 分析:把一个数倒过来,然后看两个数是否相同. public class Solution { public boolean isPalindrome(int x) { ) { return false; } , inputX = x; ) { palindromeX = palindromeX * + (x % ); x = x / ; } ret…

Reverse Integer Reverse digits of an integer. Example1: x = 123, return 321Example2: x = -123, return -321 click to show spoilers. Have you thought about this? Here are some good questions to ask before coding. Bonus points for you if you have alread…