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/
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