Codeforces899C Dividing the numbers(数论)

http://codeforces.com/problemset/problem/899/C

tot为奇数时，绝对差为1；tot为偶数时，绝对差为0。

难点在于如何输出。

 #include<iostream>
 #include<cstdio>
 #include<cstring>
 #include<algorithm>
 #include<cstdlib>
 #include<cmath>
 #include<vector>
 #include<stack>
 #include<queue>
 #define lson l, m, rt<<1
 #define rson m+1, r, rt<<1|1
 #define IO ios::sync_with_stdio(false);cin.tie(0);
 #define INF 0x3f3f3f3f
 #define MAXN 500010
 const int MOD=1e9+;
 typedef long long ll;
 using namespace std;
 ll n;
 int main()
 {
     while(cin >> n){
         ll tot = (+n)*n/;
         if(tot&){
             cout << "" << endl;
             cout << n/ << " ";
         }
         else{
             cout << "" << endl;
             cout << n/ << " ";
         }
         for(int i = n, j = ; i > ; i -= , j = !j){
             cout << i-j << " " ;
         }
         cout << endl;
     }
     return ;
 }