SPOJ - BALNUM 题意: Balanced Numbers:数位上的偶数出现奇数次,数位上的奇数出现偶数次(比如2334, 2出现1次,4出现1次,3出现两次,所以2334是 Balanced Numbers) ,求一个区间内有多少Balanced Numbers. 解题思路:看题很容易想到数位dp,但是怎么记录某数字出现的次数呢?由于某数字出现的次数只与奇偶有关,与大小没有关系,所以我们可以分别用0,1,2来表示某数字没有出现,出现奇数次,出现偶数次,然后就可以用三进制来记录所有数字…

Balanced Numbers 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 app…

Balanced Numbers https://vjudge.net/contest/287810#problem/K 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 rep…

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…

一个数字是Balanced Numbers,当且仅当组成这个数字的数,奇数出现偶数次,偶数出现奇数次 一下子就相到了三进制状压,数组开小了,一直wa,都不报re, 使用记忆化搜索,dp[i][s] 表示长度为i,状态为s,时,满足条件的balance number的个数 #include <stdio.h> #include <string.h> #include <stdlib.h> #include <algorithm> #include <io…

题目链接 一个数称为平衡数, 满足他各个数位里面的数, 奇数出现偶数次, 偶数出现奇数次, 求一个范围内的平衡数个数. 用三进制压缩, 一个数没有出现用0表示, 出现奇数次用1表示, 出现偶数次用2表示, 这样只需要开一个20*60000的数组. #include<bits/stdc++.h> using namespace std; #define pb(x) push_back(x) #define ll long long #define mk(x, y) make_pair(x, y)…

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…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=3001 题目: 题意:n个城市,m条边,每条边都有一个权值,问你经过所有的城市且每条边通过次数不超过两次的最短距离. 思路:状压dp+三进制,dp[i][j]表示在状态i下以j为目标城市的最短距离,转移方程为nw = i + fi[k];dp[nw][k] = min(dp[nw][k], dp[i][j] + mp[j][k]). 代码实现如下: #include <set> #include &…

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…

Balanced Number Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 3798    Accepted Submission(s): 1772 Problem Description A balanced number is a non-negative integer that can be balanced if a pi…