题解 | #Hello World for U#

#include <bits/stdc++.h>
using namespace std;

int main(){
	string str;
	//n1=n3 && n1+n2+n3=N+2 所以n1 max=(N+2)/3 
	cin>>str;
		int len=str.length();
		int side=(len+2)/3;
		int mid=len-side*2;
		for(int i=0;i<side-1;i++){
			cout<<str[i];
			for(int j=0;j<mid;j++) cout<<" ";
			cout<<str[len-1-i];
			cout<<endl;
		}
		//最后一行
		for(int i=side-1;i<=side+mid;i++) cout<<str[i]; 
	
	return 0;
}