新月

不含前导零且相邻两个数字之差至少为2的正整数被称为windy数。windy想知道，在A和B之间，包括A和B，总共有多少个windy数？这是一道数位dp,设dp[i][j]，dp[i][j]表示i为长度，j为最高位上的数字的个数。#include#include#includeint dp[100][14];void init(){int i,j,k;memset

Problem DescriptionA 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 digi

Problem DescriptionA peak number is defined as continuous digits {D0, D1 … Dn-1} (D0 > 0 and n >= 3), which exist Dm (0 Di+1 (m A number is called bi-peak if it is a concatenation of two peak n

Consider the decimal presentation of an integer. Let's call a number d-magic if digit d appears in decimal presentation of the number on even positions and nowhere else.For example, the numbers 

DescriptionThe distance between two integers is defined as the sum of the absolute result of subtracting their digits. For example, the distance between the numbers 4561 and 3278 is |4 – 3| + |5 -

Problem DescriptionAs we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is one of them:Yuta has an array A of length

Problem DescriptionFor a decimal number x with n digits (AnAn-1An-2 ... A2A1), we define its weight as F(x) = An * 2n-1 + An-1 * 2n-2 + ... + A2 * 2 + A1 * 1. Now you are given two numbers A and

DescriptionThe 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) i

Problem Description#define xhxj (Xin Hang senior sister(学姐)) If you do not know xhxj, then carefully reading the entire description is very important.As the strongest fighting force in UESTC,

Problem Description　　单身!　　依然单身！　　吉哥依然单身！　　DS级码农吉哥依然单身！　　所以，他生平最恨情人节，不管是214还是77，他都讨厌！　　　　吉哥观察了214和77这两个数，发现：　　2+1+4=7　　7+7=7*2　　77=7*11　　最终，他发现原来这一切归根到底都是因为和7有关！所以，他现在甚至讨厌一切和7有关

Binary-coded decimal (BCD) is an encoding for decimal numbers in which each digit is represented by its own binary sequence. To encode a decimal number using the common BCD encoding, each decimal di

Problem DescriptionA wqb-number, or B-number for short, is a non-negative integer whose decimal form contains the sub- string "13" and can be divided by 13. For example, 130 and 2613 are wqb-numbe

The Little Elephant very much loves sums on intervals.This time he has a pair of integers l and r (l ≤ r). The Little Elephant has to find the number of such integers x (l ≤ x ≤ r), that the f

Problem DescriptionThe counter-terrorists found a time bomb in the dust. But this time the terrorists improve on the time bomb. The number sequence of the time bomb counts from 1 to N. If the curren

Problem Description杭州人称那些傻乎乎粘嗒嗒的人为62（音：laoer）。杭州交通管理局经常会扩充一些的士车牌照，新近出来一个好消息，以后上牌照，不再含有不吉利的数字了，这样一来，就可以消除个别的士司机和乘客的心理障碍，更安全地服务大众。不吉利的数字为所有含有4或62的号码。例如：62315 73418 88914都属于不吉利号码。但是，61152虽然含有6和

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 if it is divisible by each of its nonzero digits. We will not argue wi