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

老弟写的代码这么逆天也敢发这种标题，XSWL
搁这做自我介绍呢


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


菜，就多练

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