C. Amr and Chemistry Problem's Link: http://codeforces.com/problemset/problem/558/C Mean: 给出n个数,让你通过下面两种操作,把它们转换为同一个数.求最少的操作数. 1.ai = ai*2 2.ai = ai/2 (向下取整) analyse: 基本思路:首先枚举出每个数能够到达的数字并且记录下到达该数组需要的步数,然后从到达次数为n次的数字中选择步数最小的即为答案. 对于一个数字Ai,它可以变换得到的数字可…

点击打开链接 Amr and Chemistry time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Amr loves Chemistry, and specially doing experiments. He is preparing for a new interesting experiment. Amr has n di…

Codeforces 558C 题意:给n个数字,对每一个数字能够进行两种操作:num*2与num/2(向下取整),求:让n个数相等最少须要操作多少次. 分析: 计算每一个数的二进制公共前缀. 枚举法亦可. /* *Author : Flint_x *Created Time : 2015-07-22 12:33:11 *File name : whust2_L.cpp */ #include<iostream> #include<sstream> #include<fstr…

题意: n个数.每次能够选一个数 让其 *=2 或者 /=2 问至少操作多少次使得全部数相等. 思路: 对于每一个数,计算出这个数能够变成哪些数,以及变成那个数的最小步数,用两个数组保存 cnt[i] 表示序列中有cnt个数能够变成i step[i] 表示能变成i的 那些数 变成i的花费和是多少. 当中.遇到奇数的时候要特殊处理一下: 比方,7 能够通过 /2 然后 *2得到6,也就是说不论什么奇数 i (不包含1)都能够通过2次操作变为 i -1: 代码例如以下: #include<cstdi…

 题意:给定一个数列,每次操作仅仅能将某个数乘以2或者除以2(向下取整). 求最小的操作次数使得全部的数都变为同样值. 比赛的时候最后没实现.唉.之后才A掉.開始一直在想二分次数,可是半天想不出怎么推断.后来发现事实上每一个数都能变成的数非常少非常少(最多400个不到).于是想到用数学方法+一点暴力,可惜时间不够了. 也不能全然算是数论题.仅仅是用到了一些数学思想.须要一点预处理,后面的计算中还会用到二分的技巧. 对某个数n,设n = s*2^r(当中s为奇数),则n能变成这样一些数:s*2…

题目链接: C. Amr and Chemistry time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Amr loves Chemistry, and specially doing experiments. He is preparing for a new interesting experiment. Amr has n …

time limit per test1 second memory limit per test256 megabytes inputstandard input outputstandard output Amr loves Chemistry, and specially doing experiments. He is preparing for a new interesting experiment. Amr has n different types of chemicals. E…

C. Amr and Chemistry Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/558/problem/C Description Amr loves Chemistry, and specially doing experiments. He is preparing for a new interesting experiment. Amr has n different type…

Amr loves Chemistry, and specially doing experiments. He is preparing for a new interesting experiment. Amr has n different types of chemicals. Each chemical i has an initial volume of ai liters. For this experiment, Amr has to mix all the chemicals…

C. Amr and Chemistry time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Amr loves Chemistry, and specially doing experiments. He is preparing for a new interesting experiment. Amr has n differ…