1031. Hello World for U (20)

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 n₁ characters, then left to right along the bottom line with n₂ characters, and finally bottom-up along the vertical line with n₃ characters.  And more, we would like U to be as squared as possible -- that is, it must be satisfied that n₁ = n₃ = max { k| k <= n₂ for all 3 <= n₂ <= N } with n₁ + n₂ + n₃ - 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

 

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分清逻辑关系即可

参考代码：

#include <iostream>

using namespace std;

int main()
{
    string s;
    cin>>s;
    int length = (s.length()+2)/3;  //两边纵向高度
    int mid = s.length()-2*(length-1)-2;    //中间空格数
    for(int i=0;i<length-1;i++){
        cout<<s[i];
        for(int j=0;j<mid;j++)
            cout<<" ";
        cout<<s[s.length()-i-1]<<endl;
    }
    for(int i=length-1;i<length+mid+1;i++){
        cout<<s[i];
    }
    return 0;
}