分组找规律，奇数偶数规律不同 很简单。不会有人用数组吧哈哈哈，哪个飞舞（doge）（说的就是你）

#include <iostream> using namespace std; int main(){ int a; cin>>a; int b[1000]={2,1,4,3,6,5,8,7,10,9,12,11,14,13,16,15,18,17,20,19,22,21,24,23,26,25,28,27,30,29,32,31,34,33,36,35,38,37,40,39,42,41,44,43,46,45,48,47,50,49,52,51,54,53,56,55,58,57,60,59,62,61,64,63,66,65,68,67,70,69,72,71,74,73,76,75,78,77,80,79,82,81,84,83,86,85,88,87,90,89,92,91,94,93,96,95,98,97,100,99}; for(int i=0;i<a;i++)cout<<b[i]<<" "; return 0; }

#include<bits/stdc++.h> using namespace std; int main(){ long long n; cin>>n; for(int i=1;i<=n;++i){ if(i%2==0){ cout<<i-1<<" "; } else if(i%2!=0){ cout<<i+1<<" "; } } return 0; }

#include <iostream> using namespace std; int main(){ int a; cin>>a; int b[1000]={2,1,4,3,6,5,8,7,10,9,12,11,14,13,16,15,18,17,20,19,22,21,24,23,26,25,28,27,30,29,32,31,34,33,36,35,38,37,40,39,42,41,44,43,46,45,48,47,50,49,52,51,54,53,56,55,58,57,60,59,62,61,64,63,66,65,68,67,70,69,72,71,74,73,76,75,78,77,80,79,82,81,84,83,86,85,88,87,90,89,92,91,94,93,96,95,98,97,100,99}; for(int i=0;i<a;i++)cout<<b[i]<<" "; return 0; }

#include <iostream> using namespace std; int main(){ int n; cin >> n; int x = 2; for(int i = 1;i <= n;i++){ cout << x << " "; if(i % 2 == 1){ x -= 1; }else{ x += 3; } } return 0; }

#include <iostream> using namespace std; int main(){ int n,i=2,j=1,m=1; cin>>n; while(n>0) { n--; if(m%2==1) { cout<<i<<" "; i+=2; } else { cout<<j<<" "; j+=2; } m++; } printf("\n"); return 0; }

#include<bits/stdc++.h> using namespace std; int main() { int n; cin>>n; for(int i=1;i<=n;++i) { if(i%2==1) cout<<i+1<<" "; else cout<<i-1<<" "; } return 0; }