题目:http://codeforces.com/contest/233/problem/A
输出 ppi = i且pi ≠ i的数列
思路:pi=x px=i
#include <iostream> using namespace std; int main() { int n; cin>>n; if(n%2!=0) cout <<"-1"; else { for(int i=0;i<n;i++) { cout<<n-i<<" "; } } return 0; }
转载于:https://www.cnblogs.com/danielqiu/archive/2013/01/23/2872879.html