/** 题目:poj3208 Apocalypse Someday 链接:http://poj.org/problem?id=3208 题意:求第K(K <= 5*107)个有连续3个6的数. 思路:数位dp+二分. dp[i][j]表示长度为i,前缀状态为j时含有的个数. j=0表示含有前导0: j=1表示前缀连续1个6 j=2表示前缀连续2个6 j=3表示前缀连续3个6 j=4表示前缀不是6: */ //#include<bits/stdc++.h> #include<cstr…

积累点: 1: (l&r)+((l^r)>>) == (l+r)/2 2: 注意判断现在是否有限制.当枚举下一个量时,是(isQuery && j==end),不要搞错. 传送门:http://acm.upc.edu.cn/problem.php?id=2223 题意: 能被7整除或者含7的数称为A-Number,所有A-Number从小到大写好,下标编号(从1开始),去掉那些下标为A-Number的数,剩下的数称为B-Number.求第N个B-Number是多少. 思…

All submissions for this problem are available. Chef likes numbers and number theory, we all know that. There are N digit strings that he particularly likes. He likes them so much that he defines some numbers to be beautiful numbers based on these di…

K-th Nya Number Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 125536/65536 K (Java/Others)Total Submission(s): 3155    Accepted Submission(s): 1021 Problem Description Arcueid likes nya number very much.A nya number is the number which has…

题目链接: http://hihocoder.com/problemset/problem/1301?sid=804672 题解: 二分答案,每次判断用数位dp做. #include<iostream> #include<cstring> #include<cstdio> using namespace std; typedef long long LL; const LL INFLL = 0x3f3f3f3f3f3f3f3fLL; //dp[x][0]表示高位还没有出…

Balanced Number Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 9036    Accepted Submission(s): 4294 Problem Description A balanced number is a non-negative integer that can be balanced if a pi…

题目链接:https://cn.vjudge.net/contest/278036#problem/C 题目大意:手首先是T组数据,然后每一次输入两个数l,r,求这个区间里面满足以某个数字为中心的两侧力矩和相等的个数,举个例子,4139,我们如果把3当做对称点,那么力矩和的计算方式= (1-3)*4 + 3*(2-3)+9*(4-3)=0,这个数是满足题目条件的. 具体思路:模板题,我们用一个三维dp储存结果,dp[len][pos][sum],len代表的是当前处理的是第几位,pos代表的是当…

思路:dp[i][j]:表示第i位在B进制下数字和. 用二分找第k个数! 代码如下: #include<iostream> #include<stdio.h> #include<algorithm> #include<iomanip> #include<cmath> #include<cstring> #include<vector> #define ll __int64 using namespace std; ][],…

SNIBB Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1485    Accepted Submission(s): 435 Problem Description   As we know, some numbers have interesting property. For example, any even number h…

题目链接:https://vjudge.net/problem/38405 #include<bits/stdc++.h> using namespace std; ][]; ]; long long dfs(int pos,int preok,int pre1) { ) ; ) return dp[pos][pre1]; :b[pos]; ; ; ;i<=up;i++) { ,,i==); ,,i==); } if (preok) dp[pos][pre1]=ans; return a…

传送门:hdu 5898 odd-even number 思路:数位DP,套着数位DP的模板搞一发就可以了不过要注意前导0的处理,dp[pos][pre][status][ze] pos:当前处理的位 pre:上一位的奇偶性 status:截止到上一位的连续段的奇偶性 ze:是否有前导0 /************************************************************** Problem:hdu 5898 odd-even number User: yo…

http://www.codeforces.com/gym/100827/attachments Hill Number Time Limits:  5000 MS   Memory Limits:  200000 KB 64-bit interger IO format:  %lld   Java class name:  Main Description A Hill Number is a number whose digits possibly rise and then possibl…

K-wolf Number Problem Description   Alice thinks an integer x is a K-wolf number, if every K adjacent digits in decimal representation of x is pairwised different.Given (L,R,K), please count how many K-wolf numbers in range of [L,R].   Input   The in…

Accept: 189    Submit: 461Time Limit: 1000 mSec    Memory Limit : 32768 KB  Problem Description One integer number x is called "Mountain Number" if: (1) x>0 and x is an integer; (2) Assume x=a[0]a[1]...a[len-2]a[len-1](0≤a[i]≤9, a[0] is posit…

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…

 Balanced Number Time Limit:3000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu 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 wi…

// 多校5 HDU5787 K-wolf Number 数位DP // dp[pos][a][b][c][d][f] 当前在pos,前四个数分别是a b c d // f 用作标记,当现在枚举的数小于之前的数时,就不用判断i与dig[pos]的大小 // 整体来说就,按位往后移动,每次添加后形成的数都小于之前的数,并且相邻k位不一样,一直深搜到cnt位 // http://blog.csdn.net/weizhuwyzc000/article/details/52097690 // #prag…

K-wolf Number 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5787 Description Alice thinks an integer x is a K-wolf number, if every K adjacent digits in decimal representation of x is pairwised different. Given (L,R,K), please count how many K-wolf…

 Problem Description One integer number x is called "Mountain Number" if: (1) x>0 and x is an integer; (2) Assume x=a[0]a[1]...a[len-2]a[len-1](0≤a[i]≤9, a[0] is positive). Any a[2i+1] is larger or equal to a[2i] and a[2i+2](if exists). For e…

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…

Round Numbers Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 6983   Accepted: 2384 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',…

题目链接: http://codeforces.com/problemset/problem/55/D 数位DP 题目描述: 一个数能被它每位上的数字整除(0除外),那么它就是beautiful number.问区间[a,b]上有多少个beautiful number.如102就是一个beautiful number,因为它能整除1,2.14不是,因为14不能整除4. 解法: 数位DP,设dp[i][j][k]为累计到第i为,公倍数为j,模lcm(1,2,```,9)=2520的余数为k的数的个…

Number 题目背景 SOURCE:NOIP2015-SHY-10 题目描述 如果一个数能够表示成两两不同的 3 的幂次的和,就说这个数是好的. 比如 13 是好的,因为 13 = 9 + 3 + 1 . 又比如 90 是好的,因为 90 = 81 + 9 . 现在我们用 a[i] 表示第 i 小的好数. 比如 a[1] = 1, a[2] = 3, a[5] = 10 . 给定 L,R,请求出 a[L] 到 a[R] 的 和 mod 232. 输入格式 第一行一个整数 T,表示数据组数. 接…

Mountain Number One integer number x is called "Mountain Number" if: (1) x>0 and x is an integer; (2) Assume x=a[0]a[1]...a[len-2]a[len-1](0≤a[i]≤9, a[0] is positive). Any a[2i+1] is larger or equal to a[2i] and a[2i+2](if exists). For exampl…

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 digit of the number, the distance f…

每一位都大于等于前一位的数叫Ramp Number 给一个数,如果不是Ramp Number输出-1,如果是Ramp Number输出比它小的Ramp Number的个数 只和每一位上的数字有关 #include <iostream> #include <cstdio> #include <cstdlib> #include <cstring> #include <cmath> #include <queue> #include &l…

B. Fi Binary Number     A Fi-binary number is a number that contains only 0 and 1. It does not contain any leading 0. And also it does not contain 2 consecutive 1. The first few such number are 1, 10, 100, 101, 1000, 1001, 1010, 10000, 10001, 10010,…

Problem Description For a number,if the length of continuous odd digits is even and the length of continuous even digits is odd,we call it odd-even number.Now we want to know the amount of odd-even number between L,R(1<=L<=R<= 9*10^18).    Input…

Mountain NumberFZU-2109 题目大意:一个大于0的数字x,分写成x=a[0]a[1]a[2][3]..a[n]的形式,(比如x=1234,a[0]=1,a[1]=2,a[3]=3,a[3]=4),Mountain Number要满足对于a[2*i+1]要大于等于a[2*i]和a[2*i+2],给定范围l,r问,有多少个Mountain Number 就简单的数位dp,照着题意写就行,而且求的是数字,前导0并没有任何影响,对于全0的情况,我们把0也特别视为Mountain Nu…

beautiful number Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 801    Accepted Submission(s): 518 Problem Description Let A=∑ni=1ai∗10n−i(1≤ai≤9)(n is the number of A's digits). We call A as “…