Problem Description

If you ever tried to read a html document on a Macintosh, you know how hard it is if no Netscape is installed.
Now, who can forget to install a HTML browser? This is very easy because most of the times you don’t need one on a MAC because there is a Acrobate Reader which is native to MAC. But if you ever need one, what do you do?
Your task is to write a small html-browser. It should only display the content of the input-file and knows only the html commands (tags) <br> which is a linebreak and <hr> which is a horizontal ruler. Then you should treat all tabulators, spaces and newlines as one space and display the resulting text with no more than 80 characters on a line.

Input

The input consists of a text you should display. This text consists of words and HTML tags separated by one or more spaces, tabulators or newlines.
A word is a sequence of letters, numbers and punctuation. For example, “abc,123” is one word, but “abc, 123” are two words, namely “abc,” and “123”. A word is always shorter than 81 characters and does not contain any ‘<’ or ‘>’. All HTML tags are either <br> or <hr>.

Output

You should display the the resulting text using this rules:
. If you read a word in the input and the resulting line does not get longer than 80 chars, print it, else print it on a new line.
. If you read a <br> in the input, start a new line.
. If you read a <hr> in the input, start a new line unless you already are at the beginning of a line, display 80 characters of ‘-’ and start a new line (again).
The last line is ended by a newline character.

Sample Input

Hallo, dies ist eine
ziemlich lange Zeile, die in Html
aber nicht umgebrochen wird.
<br>
Zwei <br> <br> produzieren zwei Newlines.
Es gibt auch noch das tag <hr> was einen Trenner darstellt.
Zwei <hr> <hr> produzieren zwei Horizontal Rulers.
Achtung mehrere Leerzeichen irritieren

Html genauso wenig wie

mehrere Leerzeilen.

Sample Output

Hallo, dies ist eine ziemlich lange Zeile, die in Html aber nicht umgebrochen
wird.
Zwei

produzieren zwei Newlines. Es gibt auch noch das tag

was einen Trenner darstellt. Zwei

produzieren zwei Horizontal Rulers. Achtung mehrere Leerzeichen irritieren Html
genauso wenig wie mehrere Leerzeilen.

题目大意：

输入1堆字符 每行最多80个 每个单词都是连续的 不连续的不算一个单词 即不给空格 tab 等分开的字符 一个单词中不包含< > 包含其他符号

如果遇到 <br> 则输出空格
遇到<hr> 则换到下一行 然后输出80个- 然后再换一行 注意 如果是已经在一个新的一行了 就不用再换到下一行后再输出80个‘-’ 就可以直接输出
输出的时候 每行最多有80个字符 每个单词之间有1个空格

c++

#include <iostream>
#include<cstdio>
#include<cstring>
#include<string>
using namespace std;
int main()
{
    string a;
    int b,c,d,e,f;
    c=0;          //用来记录单词个数
    while(cin>>a)
    {
        b=a.size();
        if(a=="<br>")
        {
            cout<<endl;
            c=0;
        }
        else if(a=="<hr>")
        {
            if(c!=0)      //判断这一行是否存在单词存在则输出换行
                cout<<endl;
            cout<<"--------------------------------------------------------------------------------"<<endl;
            c=0;
        }
        else
        {
            if(c==0)
            {
                cout<<a;
                c=a.size();
            }
            else if(c+b<80)   //判断单词个数是否超过80
            {
                cout<<" "<<a;
                c=c+b+1;
            }
            else
            {
                cout<<endl<<a;
                c=a.size();;
            }
        }
    }
    cout<<endl;
    return 0;
}