RT。

J组T4 $\Theta(n^2)$ 75pts，S T3 以下代码 16pts。

#include<iostream>
#include<cstdio> 
#define IWantToAKNOI main(){
#define NoWay std::cin>>n;
#define chen_zhe for(int
#define NB i=1;i<=n;i++){ 
#define AK printf("-1"); 
#define IOI std::cout<<std::endl;
#define Everyday }  
#define kkksc03 return
#define AKIOI 0;
#define Maybe int
#define IWantToAKIOI freopen("palin.in","r",stdin); 
#define But freopen("palin.out","w",stdout);
#define IWantToAKCSP n;
Maybe IWantToAKCSP
Maybe IWantToAKNOI
	IWantToAKIOI
	But
	NoWay
	chen_zhe NB
		AK
		IOI
	Everyday
	kkksc03 AKIOI
Everyday

另外问一下GD J 275 S 31 能拿什么