1031. Hello World for U (20) PAT

题目：http://pat.zju.edu.cn/contests/pat-a-practise/1031

分析：

简单题，调整数组的输出次序就可以了。

输入数组长度为len。n1 = n3 = (len+2)/3;   n2 = len - n1 - n3;

第一行最左边对应的是原数组的第一个字符，最后边对应的是原数组的最后一个字符。总共输出n1行。

题目描述：

Given any string of N (>=5) characters, you are asked to form the characters into the shape of U. For example, "helloworld" can be printed as:

h  d
e  l
l  r
lowo

That is, the characters must be printed in the original order, starting top-down from the left vertical line with n ₁ characters, then left to right along the bottom line with n ₂ characters, and finally bottom-up along the vertical line with n ₃ characters. And more, we would like U to be as squared as possible -- that is, it must be satisfied that n ₁ = n ₃ = max { k| k <= n ₂ for all 3 <= n ₂ <= N } with n ₁ + n ₂ + n ₃ - 2 = N.

Input Specification:

Each input file contains one test case. Each case contains one string with no less than 5 and no more than 80 characters in a line. The string contains no white space.

Output Specification:

For each test case, print the input string in the shape of U as specified in the description.

Sample Input:

helloworld!

Sample Output:

h   !
e   d
l   l
lowor

参考代码：

#include<iostream>
#include<string.h>
using namespace std;
#define max 85
char input[max];

int main()
{
	int len;
    int n1,n2,n3;
	int i,j;
	cin>>input;
	len = strlen(input);
	n1 = n3 = (len + 2) / 3 ;
	n2 = len - 2*n1;
    for(i=0; i<n1-1; i++)
	{
		cout<<input[i];
		for(j=0; j<n2; j++) cout<<" ";
		cout<<input[len-1-i]<<endl;
	}
	for(j=i; j<len-i; j++)
		cout<<input[j];
	cout<<endl;

	return 0;
}