Integer Sequence Dividing CodeForces - 1102A (规律)
You are given an integer sequence 1,2,…,n1,2,…,n. You have to divide it into two sets AAand BB in such a way that each element belongs to exactly one set and |sum(A)−sum(B)||sum(A)−sum(B)| is minimum possible.
The value |x||x| is the absolute value of xx and sum(S)sum(S) is the sum of elements of the set SS.
Input
The first line of the input contains one integer nn (1≤n≤2⋅1091≤n≤2⋅109).
Output
Print one integer — the minimum possible value of |sum(A)−sum(B)||sum(A)−sum(B)| if you divide the initial sequence 1,2,…,n1,2,…,n into two sets AA and BB.
Examples
3
0
5
1
6
1
Note
Some (not all) possible answers to examples:
In the first example you can divide the initial sequence into sets A={1,2}A={1,2} and B={3}B={3} so the answer is 00.
In the second example you can divide the initial sequence into sets A={1,3,4}A={1,3,4} and B={2,5}B={2,5} so the answer is 11.
In the third example you can divide the initial sequence into sets A={1,4,5}A={1,4,5} and B={2,3,6}B={2,3,6} so the answer is 11.
题意:给你一个整数N,让你将1~N这N个整数分成两个集合,
问这两个集合的元素数值和的差最小能是多少。
思路:
先写几个样例来看下。
当N=3,
1,2,3 可以把1和2分到一个集合,3分到另一个集合。这样差为0
当N=4
1,2,3,4可以把 1和4分到一个集合,2和3在另一个集合,这样差为0
当N=5
1,2,3,4,5,可以分成这样{1,3,4},{2,5} 差为1
我们在算下这三个样例的所有元素和
N=3 ,sum=6
N=4,sum=10
N=5,sum=15
规律就可以看出来了,当1~N的和为偶数的时候,一定可以分成两个相同的sum的集合
为奇数可以分成相差为1的两个集合。
那么就根据规律来写程序了。
我的AC代码:
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <cmath>
#include <queue>
#include <stack>
#include <map>
#include <set>
#include <vector>
#define rep(i,x,n) for(int i=x;i<n;i++)
#define repd(i,x,n) for(int i=x;i<=n;i++)
#define pii pair<int,int>
#define pll pair<long long ,long long>
#define gbtb ios::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define MS0(X) memset((X), 0, sizeof((X)))
#define MSC0(X) memset((X), '\0', sizeof((X)))
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define gg(x) getInt(&x)
using namespace std;
typedef long long ll;
inline void getInt(int* p);
const int maxn=;
const int inf=0x3f3f3f3f;
/*** TEMPLATE CODE * * STARTS HERE ***/
ll n;
int main()
{
cin>>n;
ll ans=(n*(+n))/2ll;
if(ans&)
{
cout<<<<endl;
}else
{
cout<<<<endl;
}
return ;
} inline void getInt(int* p) {
char ch;
do {
ch = getchar();
} while (ch == ' ' || ch == '\n');
if (ch == '-') {
*p = -(getchar() - '');
while ((ch = getchar()) >= '' && ch <= '') {
*p = *p * - ch + '';
}
}
else {
*p = ch - '';
while ((ch = getchar()) >= '' && ch <= '') {
*p = *p * + ch - '';
}
}
}
MY BLOG:
https://www.cnblogs.com/qieqiemin/
Integer Sequence Dividing CodeForces - 1102A (规律)的更多相关文章
- CodeForces - 1102A
You are given an integer sequence 1,2,-,n1,2,-,n. You have to divide it into two sets AA and BB in s ...
- CodeForces - 1102A(思维题)
https://vjudge.net/problem/2135388/origin Describe You are given an integer sequence 1,2,-,n. You ha ...
- Codeforces Round #452 (Div. 2)-899A.Splitting in Teams 899B.Months and Years 899C.Dividing the numbers(规律题)
A. Splitting in Teams time limit per test 1 second memory limit per test 256 megabytes input standar ...
- 递推:Number Sequence(mod找规律)
解题心得: 1.对于数据很大,很可怕,不可能用常规手段算出最后的值在进行mod的时候,可以思考找规律. 2.找规律时不必用手算(我傻,用手算了好久).直接先找前100项进行mod打一个表出来,直接看就 ...
- CodeForces - 810C(规律)
C. Do you want a date? time limit per test 2 seconds memory limit per test 256 megabytes input stand ...
- Codeforces Round #531 (Div. 3) ABCDEF题解
Codeforces Round #531 (Div. 3) 题目总链接:https://codeforces.com/contest/1102 A. Integer Sequence Dividin ...
- Codeforces Round #604 (Div. 2) D. Beautiful Sequence(构造)
链接: https://codeforces.com/contest/1265/problem/D 题意: An integer sequence is called beautiful if the ...
- CodeForces - 1059C Sequence Transformation (GCD相关)
Let's call the following process a transformation of a sequence of length nn. If the sequence is emp ...
- Sequence in the Pocket【思维+规律】
Sequence in the Pocket 题目链接(点击) DreamGrid has just found an integer sequence in his right pocket. A ...
随机推荐
- 写给spring版本的那些事儿
1.远程调用rmi协议 Exception in thread "main" java.rmi.UnmarshalException: error unmarshalling re ...
- 一个CSS值转REM的Sublime Text插件
CSSREM 一个CSS的px值转rem值的Sublime Text 3自动完成插件. 插件效果如下: 安装 下载本项目,比如:git clone https://github.com/flashli ...
- (转)Spring boot(一):入门篇
https://www.cnblogs.com/ityouknow/p/5662753.html#!comments 构建微服务:Spring boot 入门篇 什么是Spring Boot Spri ...
- Installation Oracle11gR2 RAC---常见报错处理
第六章.报错处理 6.1 root.sh脚本执行失败处理 安装grid时,执行rootsh脚本报错如下: Adding Clusterware entries to inittab USM drive ...
- mysql如何修改开启允许远程连接 (windows)
每天学习一点点 编程PDF电子书免费下载: http://www.shitanlife.com/code 关于mysql远程连接的问题,大家在公司工作中,经常会遇到mysql数据库存储于某个人的电脑上 ...
- javascript中call,apply,bind的用法对比分析
这篇文章主要给大家对比分析了javascript中call,apply,bind三个函数的用法,非常的详细,这里推荐给小伙伴们. 关于call,apply,bind这三个函数的用法,是学习java ...
- 【html5】如何让Canvas标签自适应设备
javascript方法: var oC=document.querySelectorAll('canvas')[0];oC.width=document.documentElement.client ...
- Github(1) 桌面版使用
桌面版使用 https://www.cnblogs.com/Chenshuai7/p/5486278.html 1安装 我的账号 1051196347@qq.com 密码 L*******4***** ...
- Arduino IDE for ESP8266 项目云盒子 (1)AP直接模式
手机直接连接esp8266辐射的WIFI,通信. https://item.taobao.com/item.htm?spm=a230r.1.14.20.eYblO3&id=5219451024 ...
- 流程控制之for
for循环是 迭代式循环,其强大之处在于循环取值 用法一: l = [1, 2, 3, 4, 5, 5, 6, 5, 4, 3] for x in l: print(x) info = {'} for ...