<p>The string <code>&quot;PAYPALISHIRING&quot;</code> is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility)</p>

<pre>
P   A   H   N
A P L S I I G
Y   I   R
</pre>

<p>And then read line by line: <code>&quot;PAHNAPLSIIGYIR&quot;</code></p>

<p>Write the code that will take a string and make this conversion given a number of rows:</p>

<pre>
string convert(string s, int numRows);
</pre>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> s = &quot;PAYPALISHIRING&quot;, numRows = 3
<strong>Output:</strong> &quot;PAHNAPLSIIGYIR&quot;
</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> s = &quot;PAYPALISHIRING&quot;, numRows = 4
<strong>Output:</strong> &quot;PINALSIGYAHRPI&quot;
<strong>Explanation:</strong>
P     I    N
A   L S  I G
Y A   H R
P     I
</pre>

<p><strong class="example">Example 3:</strong></p>

<pre>
<strong>Input:</strong> s = &quot;A&quot;, numRows = 1
<strong>Output:</strong> &quot;A&quot;
</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= s.length &lt;= 1000</code></li>
	<li><code>s</code> consists of English letters (lower-case and upper-case), <code>&#39;,&#39;</code> and <code>&#39;.&#39;</code>.</li>
	<li><code>1 &lt;= numRows &lt;= 1000</code></li>
</ul>

#include <vector>
#include <string>

class Solution {
public:
    string convert(string s, int numRows) {
        if (numRows == 1) return s;
        string reserve = s;
        vector<string> myset;
        while(s.length()){
            if(s.length()<numRows) {
                string temp = s;
                while (temp.length()<numRows) temp += " ";
                myset.push_back(temp);
                s = "";
            } else {
                myset.push_back(s.substr(0,numRows));
                s = s.substr(numRows);
            }
            if(s.length())
            for(int i = numRows-2; i>0&& !s.empty(); i-- ){
                string t(numRows, ' ');
                t[i] = s[0];
                s = s.substr(1, s.length());
                myset.push_back(t);
            }
        }

        string worker = "";
        for(int i = 0; i<numRows; i++){
            for(int j=0; j<myset.size(); j++){
                if(worker.length()==reserve.length()) break;
                if((myset[j][i] != ' ')&&(myset[j][i]!='\u0000')&&(myset[j][i]!='\0')) {
                    worker += myset[j][i]; 
                }
            }
        }
        return worker;
    }
};
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