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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2，但不是62连号，所以不属于不吉利数字之列。你...

The 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 current number sequence inc...

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...

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 ...

For a decimal number x with n digits (A nA n-1A n-2 … A 2A 1), we define its weight as F(x) = A n * 2 n-1 + A n-1 * 2 n-2 + … + A 2 * 2 + A 1 * 1. Now you are given two numbers A and B, please calcula...

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=72　　77=711　　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有关的数！什么样的数和7有关呢？如果一个整数符合下面3个条件之一，那么我们...

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

Here is a function f(x):　　　int f ( int x ) {　　　 if ( x == 0 ) return 0;　　　 return f ( x / 10 ) + x % 10;　　　}Now, you want to know, in a given interval [A, B] (1 <= A <= B <= 10 9),...