链接:https://ac.nowcoder.com/acm/contest/338/F来源:牛客网 题目描述 AFei loves numbers. He defines the natural number containing "520" as the AFei number, such as 1234520, 8752012 and 5201314. Now he wants to know how many AFei numbers are not greater than…

http://codeforces.com/contest/747/problem/F cf #387 div2 problem f 非常好的一道题.看完题,然后就不知道怎么做,感觉是dp,但是不知道怎么枚举.还有就是一般求第k小的思路一般是什么?对这类题目理解的不是很好. 这道题,跟上一篇的题解里面写的hdu 1002 递增数的题目的解法差不多,但是底层的求解需要花一些时间去推敲! 不会做,就看官方题解,看不懂说的什么.就从下面的讨论找大神的题解. I can describe my solu…

Description xrdog has a number set. There are 95 numbers in this set. They all have something in common and are all positive integers less than 500. The naughty xiao zhuan has deleted one of the numbers in the set. Can you find the number that xiao z…

RANK  0 题数 0 期末复习没有参加,补几道喜欢的题. A: AFei Loves Magic  签到 思路 :不需考虑 碰撞 直接计算最终状态即可. #include<bits/stdc++.h> using namespace std; #define maxn 12345 int ans,n,l,t,x,d; int main() { scanf("%d%d%d",&n,&l,&t); for(int i=1;i<=n;i++) {…

链接:https://ac.nowcoder.com/acm/contest/908/F 题意: AFei has many cards. Each card has a number written on it. Now he wants to takes some out of his card and puts them in a box. And he wants to know whether the card with the number x was in the box. So…

Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example: Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x < 100, excluding [11,22,33,44,55,66,77,88,99]) Hint: A direct…

题目描述: Given a non-negative integer n, count all numbers with unique digits, x, where 0 ≤ x < 10n. Example:Given n = 2, return 91. (The answer should be the total numbers in the range of 0 ≤ x < 100, excluding [11,22,33,44,55,66,77,88,99]) 解题思路: This…

本文转自:http://msdn.microsoft.com/zh-cn/library/hh225374.aspx 查询表达式可以查询数据源并将数据是一种预期形式.             查询表达式提供 F# 中支持 LINQ.   复制 query { expression } 备注              查询表达式是计算表达式的类型类似于序列表达式.               就象通过提供代码指定顺序在序列表达式中,可以在查询表达式指定设置数据通过提供代码.  在序列表达式,yie…

Python的字符串格式化有两种方式: 百分号方式.format方式 百分号的方式相对来说比较老,而format方式则是比较先进的方式,企图替换古老的方式,目前两者并存. 1.百分号方式 语法:%[(name)][flags][width].[precision]typecode (name)      可选,用于选择指定的key flags          可选,可供选择的值有: +       右对齐:正数前加正好,负数前加负号: -        左对齐:正数前无符号,负数前加负号: 空…

python基本数据类型 1.数字 int(整型)      在32位机器上,整数的位数为32位,取值范围为-2**31-2**31-1,即-2147483648-2147483647  在64位系统上,整数的位数为64位,取值范围为-2**63-2**63-1,即-9223372036854775808-9223372036854775807 float(浮点型)     浮点数也就是小数,按照科学记数法表示时,一个浮点数的小数点位置是可变的,比如,1.23x109和12.3x108是完全相等…