思路:搜索的时候是从高位到低位,所以一旦遇到非0数字,也就确定了数的长度,这样就知道回文串的中心点. 代码如下: #include<iostream> #include<cstdio> #include<cmath> #include<algorithm> #include<vector> #include<cstring> #define ll long long using namespace std; ll dp[][][];…

2018 ACM 国际大学生程序设计竞赛上海大都会赛重现赛 J Beautiful Numbers (数位DP) 链接:https://ac.nowcoder.com/acm/contest/163/J?&headNav=acm来源:牛客网 时间限制:C/C++ 8秒,其他语言16秒 空间限制:C/C++ 262144K,其他语言524288K 64bit IO Format: %lld 题目描述 NIBGNAUK is an odd boy and his taste is strange a…

题目链接:http://www.lightoj.com/volume_showproblem.php?problem=1205 题解:这题作为一个数位dp,是需要咚咚脑子想想的.这个数位dp方程可能不是很好想到,由于回文串的性质肯定要考虑到对称方面,那么不妨设dp[len][sta][flag] 表示len到sta这些字符串是否能构成回文.这里的数位dp有些特殊由于要考虑到回文的性质会涉及到回朔具体看一下代码. #include <iostream> #include <cstring&…

数位DP.... Palindromic Numbers Time Limit: 2000MS Memory Limit: 32768KB 64bit IO Format: %lld & %llu [Submit]   [Go Back]   [Status] Description A palindromic number or numeral palindrome is a 'symmetrical' number like 16461 that remains the same when…

D. Beautiful numbers time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output Volodya is an odd boy and his taste is strange as well. It seems to him that a positive integer number is beautiful if…

D. Beautiful numbers Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/55/problem/D Description Volodya is an odd boy and his taste is strange as well. It seems to him that a positive integer number is beautiful if and only i…

Description The cows, as you know, have no fingers or thumbs and thus are unable to play Scissors, Paper, Stone' (also known as 'Rock, Paper, Scissors', 'Ro, Sham, Bo', and a host of other names) in order to make arbitrary decisions such as who gets…

题目链接:uva 10712 - Count the Numbers 题目大意:给出n,a.b.问说在a到b之间有多少个n. 解题思路:数位dp.dp[i][j][x][y]表示第i位为j的时候.x是否前面是相等的.y是否已经出现过n.对于n=0的情况要特殊处理前导0,写的很乱.搓死. #include <cstdio> #include <cstring> #include <iostream> #include <algorithm> using nam…

题目链接:http://www.spoj.com/problems/BALNUM/en/ Time limit: 0.123s Source limit: 50000B Memory limit: 1536MB Balanced numbers have been used by mathematicians for centuries. A positive integer is considered a balanced number if: 1)      Every even digit…

Balanced numbers have been used by mathematicians for centuries. A positive integer is considered a balanced number if: 1)      Every even digit appears an odd number of times in its decimal representation 2)      Every odd digit appears an even numb…