Codeforces Round #372 (Div. 2) C
Description
ZS the Coder is playing a game. There is a number displayed on the screen and there are two buttons, ' + ' (plus) and '
' (square root). Initially, the number 2 is displayed on the screen. There are n + 1 levels in the game and ZS the Coder start at the level 1.
When ZS the Coder is at level k, he can :
- Press the ' + ' button. This increases the number on the screen by exactly k. So, if the number on the screen was x, it becomes x + k.
- Press the '
' button. Let the number on the screen be x. After pressing this button, the number becomes
. After that, ZS the Coder levels up, so his current level becomes k + 1. This button can only be pressed when x is a perfect square, i.e. x = m2 for some positive integer m.
Additionally, after each move, if ZS the Coder is at level k, and the number on the screen is m, then m must be a multiple of k. Note that this condition is only checked after performing the press. For example, if ZS the Coder is at level 4 and current number is 100, he presses the '
' button and the number turns into 10. Note that at this moment, 10 is not divisible by 4, but this press is still valid, because after it, ZS the Coder is at level 5, and 10 is divisible by 5.
ZS the Coder needs your help in beating the game — he wants to reach level n + 1. In other words, he needs to press the '
' button ntimes. Help him determine the number of times he should press the ' + ' button before pressing the '
' button at each level.
Please note that ZS the Coder wants to find just any sequence of presses allowing him to reach level n + 1, but not necessarily a sequence minimizing the number of presses.
The first and only line of the input contains a single integer n (1 ≤ n ≤ 100 000), denoting that ZS the Coder wants to reach level n + 1.
Print n non-negative integers, one per line. i-th of them should be equal to the number of times that ZS the Coder needs to press the ' + ' button before pressing the '
' button at level i.
Each number in the output should not exceed 1018. However, the number on the screen can be greater than 1018.
It is guaranteed that at least one solution exists. If there are multiple solutions, print any of them.
3
14
16
46
2
999999999999999998
44500000000
4
2
17
46
97
In the first sample case:
On the first level, ZS the Coder pressed the ' + ' button 14 times (and the number on screen is initially 2), so the number became2 + 14·1 = 16. Then, ZS the Coder pressed the '
' button, and the number became
.
After that, on the second level, ZS pressed the ' + ' button 16 times, so the number becomes 4 + 16·2 = 36. Then, ZS pressed the '
' button, levelling up and changing the number into
.
After that, on the third level, ZS pressed the ' + ' button 46 times, so the number becomes 6 + 46·3 = 144. Then, ZS pressed the '
' button, levelling up and changing the number into
.
Note that 12 is indeed divisible by 4, so ZS the Coder can reach level 4.
Also, note that pressing the ' + ' button 10 times on the third level before levelling up does not work, because the number becomes6 + 10·3 = 36, and when the '
' button is pressed, the number becomes
and ZS the Coder is at Level 4. However, 6 is not divisible by 4 now, so this is not a valid solution.
In the second sample case:
On the first level, ZS the Coder pressed the ' + ' button 999999999999999998 times (and the number on screen is initially 2), so the number became 2 + 999999999999999998·1 = 1018. Then, ZS the Coder pressed the '
' button, and the number became
.
After that, on the second level, ZS pressed the ' + ' button 44500000000 times, so the number becomes 109 + 44500000000·2 = 9·1010. Then, ZS pressed the '
' button, levelling up and changing the number into
.
Note that 300000 is a multiple of 3, so ZS the Coder can reach level 3.
题意:note说的已经很明白了(逃)
解法:找规律,我们可以发现4, 36, 144, 400符合规律,再仔细看一下,就是 [i(i + 1)]2,
那么已经明确了,ans=i*(i+1)表示前一个开始数字,[i(i + 1)]2
是下一个,求出差除以i就行,当然需要化简一下
#include <bits/stdc++.h>
using namespace std;
string s;
map<int,int>q;
int main()
{
long long n;
cin>>n;
if(n==1)
{
cout<<"2"<<endl;
}
else
{
cout<<"2"<<endl;
long long ans=2;
for(long long i=2;i<=n;i++)
{
cout<<(i+1)*i*(i+1)-ans/i<<endl;
ans=i*(i+1);
}
}
return 0;
}
Codeforces Round #372 (Div. 2) C的更多相关文章
- Codeforces Round #372 (Div. 2)
Codeforces Round #372 (Div. 2) C. Plus and Square Root 题意 一个游戏中,有一个数字\(x\),当前游戏等级为\(k\),有两种操作: '+'按钮 ...
- Codeforces Round #372 (Div. 2) A .Crazy Computer/B. Complete the Word
Codeforces Round #372 (Div. 2) 不知不觉自己怎么变的这么水了,几百年前做A.B的水平,现在依旧停留在A.B水平.甚至B题还不会做.难道是带着一种功利性的态度患得患失?总共 ...
- Codeforces 715B & 716D Complete The Graph 【最短路】 (Codeforces Round #372 (Div. 2))
B. Complete The Graph time limit per test 4 seconds memory limit per test 256 megabytes input standa ...
- Codeforces 715A & 716C Plus and Square Root【数学规律】 (Codeforces Round #372 (Div. 2))
C. Plus and Square Root time limit per test 2 seconds memory limit per test 256 megabytes input stan ...
- Codeforces 716A Crazy Computer 【模拟】 (Codeforces Round #372 (Div. 2))
A. Crazy Computer time limit per test 2 seconds memory limit per test 256 megabytes input standard i ...
- Codeforces 716B Complete the Word【模拟】 (Codeforces Round #372 (Div. 2))
B. Complete the Word time limit per test 2 seconds memory limit per test 256 megabytes input standar ...
- Codeforces Round #372 (Div. 2) C 数学
http://codeforces.com/contest/716/problem/C 题目大意:感觉这道题还是好懂得吧. 思路:不断的通过列式子的出来了.首先我们定义level=i, uplevel ...
- Codeforces Round #372 (Div. 1) A. Plus and Square Root 数学题
A. Plus and Square Root 题目连接: http://codeforces.com/contest/715/problem/A Description ZS the Coder i ...
- Codeforces Round #372 (Div. 2) C. Plus and Square Root
题目链接 分析:这题都过了2000了,应该很简单..写这篇只是为了凑篇数= = 假设在第级的时候开方过后的数为,是第级的系数.那么 - 显然,最小的情况应该就是, 化简一下公式,在的情况下应该是,注意 ...
随机推荐
- [原创]java WEB学习笔记52:国际化 fmt 标签,国际化的总结
本博客为原创:综合 尚硅谷(http://www.atguigu.com)的系统教程(深表感谢)和 网络上的现有资源(博客,文档,图书等),资源的出处我会标明 本博客的目的:①总结自己的学习过程,相当 ...
- paper 53 :深度学习(转载)
转载来源:http://blog.csdn.net/fengbingchun/article/details/50087005 这篇文章主要是为了对深度学习(DeepLearning)有个初步了解,算 ...
- MVC4 导出word
添加程序包 DocX using System.IO;using Novacode; /// <summary> /// 导出Word /// </summary> publi ...
- Jquery Ajax调用aspx页面方法 (转载)
在asp.net webform开发中,用jQuery ajax传值一般有几种玩法 1)普通玩法:通过一般处理程序ashx进行处理: 2)高级玩法:通过aspx.cs中的静态方法+WebMethod进 ...
- viewpager+fragment+HorizontalScrollView
xml布局 <RelativeLayout android:id="@+id/rl_column" android:layout_width=&q ...
- JQuery ajax方法及参数
©屋主原创,版权归 todayeeee 所有!如需转载,必须在页面明显位置给出原文链接!商业用途请 联系我! $.ajax({ type: 'GET', // 这是请求的方式 可以是GET方 ...
- resultMap / resultType
===================resultMap:实体类的属性和通过resultMap映射后的property属性一致 <resultMap id="workerSelect& ...
- iOS的通知Notification
这里是不同的对象之间的通知, 不是本地通知. 一开始玩, 很挠头, 后来发现原来只是对象init的过程出了问题. 首先, 新建一个简单的单controller的工程. 然后打开它的ViewContro ...
- fflush函数的深入理解
本人昵称sky,欢迎与各位多多交流学习 这样的c程序想必大家都不陌生,fflush()这个函数有清除输入输出缓存的功能,那很多人就会问了,什么是清除输入输出缓存呢? 其实就是我们在printf输出的时 ...
- Java URLClassLoader和ClassLoader
开始:看名字都带有ClassLoader,叫做类加载器,事实上是可以理解为动态的加载类,不过,也不是只能加载类,也可以加载其他形式的文件,比如说.properties属性文件. 区别:其实在两个类加载 ...