题解100%AC

#include <bits/stdc++.h>
using namespace std;
int n;
int a[1005][1005];
int main(){

cin>>n;
for(int i=0;i<n;i++){
	for(int j=0;j<n;j++){
		cin>>a[i][j];	
	}
}
if(n==1){
    cout<<a[0][0];
    return 0;
}
for(int i=0;i<n;i++){
	if(i==0||i==n-1){
		for(int j=n-1;j>=0;j--){
			cout<<a[j][i]<<" ";
		}
	}else {
        for(int j=0;j<n;j++){
			if(j==0){
				cout<<a[n-1][i]<<" ";
        	}else if(j==n-1){
            	cout<<a[0][i]<<" ";
			}else{
				cout<<a[i][j]<<" ";
            }
		}
    }		
	cout<<"\n";
}
return 0;

}