How many Fibs? Description Recall the definition of the Fibonacci numbers: f1 := 1 f2 := 2 fn := f n-1 + f n-2 (n>=3) Given two numbers a and b, calculate how many Fibonacci numbers are in the range [a,b]. Input The input contains several test cases.…
F - Strange Way to Express Integers Time Limit:1000MS Memory Limit:131072KB 64bit IO Format:%I64d & %I64u Submit Status Description Elina is reading a book written by Rujia Liu, which introduces a strange way to express non-negative integers.…
n people are standing on a coordinate axis in points with positive integer coordinates strictly less than 106. For each person we know in which direction (left or right) he is facing, and his maximum speed. You can put a bomb in some point with non-n…
Problem D How Many Trees? Input: standard input Output: standard output Memory Limit: 32 MB A binary search tree is a binary tree with root k such that any node v in the left subtree of k has label (v) <label (k) and any node w in the right subtree o…
题意:Elina看一本刘汝佳的书(O_O*),里面介绍了一种奇怪的方法表示一个非负整数 m .也就是有 k 对 ( ai , ri ) 可以这样表示--m%ai=ri.问 m 的最小值. 解法:拓展欧几里德求解同余方程组的最小非负整数解.(感觉挺不容易的......+_+@) 先看前2个关系式: m%a1=r1 和 m%a2=r2 → …
专题[vjudge] - 数论0.1 web-address : https://cn.vjudge.net/contest/176171 A - Mathematically Hard 题意就是定义一个函数S.其中S(x)=sqr(1~x中与x互质的数的个数). 显然,这里要运用到Euler函数(即φ函数,题后已给出).那么,我们计算出5*10^6以内的phi后,计算一个前缀平方和就行了. B - Ifter Party 题意就是让你求一个数大于L的因数,并把它们升序输出.比较水,但是容易PE…
Aladdin and the Flying Carpet (LightOJ - 1341)[简单数论][算术基本定理][分解质因数](未完成) 标签:入门讲座题解 数论 题目描述 It's said that Aladdin had to solve seven mysteries before getting the Magical Lamp which summons a powerful Genie. Here we are concerned about the first myste…