C++ 代码

#include<bits/stdc++.h>
using namespace std;
int main(){
    string s;
    cin>>s;
    int len = s.size();
    for( int i = 0 ; i < (len+2)/3-1 ; i++){
        cout<<s[i];
        for( int j = 0 ; j<len+2-(len+2)/3-(len+2)/3 -2 ; j++) cout<<" ";
        cout<<s[len-i-1]<<endl;
    }
    for(int i = 0 ;i<len+2-(len+2)/3-(len+2)/3 ; i++){
        cout<<s[(len+2)/3+i-1];
    }
    return 0;
}