<p>Given an array of strings <code>words</code> and a width <code>maxWidth</code>, format the text such that each line has exactly <code>maxWidth</code> characters and is fully (left and right) justified.</p>

<p>You should pack your words in a greedy approach; that is, pack as many words as you can in each line. Pad extra spaces <code>&#39; &#39;</code> when necessary so that each line has exactly <code>maxWidth</code> characters.</p>

<p>Extra spaces between words should be distributed as evenly as possible. If the number of spaces on a line does not divide evenly between words, the empty slots on the left will be assigned more spaces than the slots on the right.</p>

<p>For the last line of text, it should be left-justified, and no extra space is inserted between words.</p>

<p><strong>Note:</strong></p>

<ul>
	<li>A word is defined as a character sequence consisting of non-space characters only.</li>
	<li>Each word&#39;s length is guaranteed to be greater than <code>0</code> and not exceed <code>maxWidth</code>.</li>
	<li>The input array <code>words</code> contains at least one word.</li>
</ul>

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

<pre>
<strong>Input:</strong> words = [&quot;This&quot;, &quot;is&quot;, &quot;an&quot;, &quot;example&quot;, &quot;of&quot;, &quot;text&quot;, &quot;justification.&quot;], maxWidth = 16
<strong>Output:</strong>
[
&nbsp; &nbsp;&quot;This &nbsp; &nbsp;is &nbsp; &nbsp;an&quot;,
&nbsp; &nbsp;&quot;example &nbsp;of text&quot;,
&nbsp; &nbsp;&quot;justification. &nbsp;&quot;
]</pre>

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

<pre>
<strong>Input:</strong> words = [&quot;What&quot;,&quot;must&quot;,&quot;be&quot;,&quot;acknowledgment&quot;,&quot;shall&quot;,&quot;be&quot;], maxWidth = 16
<strong>Output:</strong>
[
&nbsp; &quot;What &nbsp; must &nbsp; be&quot;,
&nbsp; &quot;acknowledgment &nbsp;&quot;,
&nbsp; &quot;shall be &nbsp; &nbsp; &nbsp; &nbsp;&quot;
]
<strong>Explanation:</strong> Note that the last line is &quot;shall be    &quot; instead of &quot;shall     be&quot;, because the last line must be left-justified instead of fully-justified.
Note that the second line is also left-justified because it contains only one word.</pre>

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

<pre>
<strong>Input:</strong> words = [&quot;Science&quot;,&quot;is&quot;,&quot;what&quot;,&quot;we&quot;,&quot;understand&quot;,&quot;well&quot;,&quot;enough&quot;,&quot;to&quot;,&quot;explain&quot;,&quot;to&quot;,&quot;a&quot;,&quot;computer.&quot;,&quot;Art&quot;,&quot;is&quot;,&quot;everything&quot;,&quot;else&quot;,&quot;we&quot;,&quot;do&quot;], maxWidth = 20
<strong>Output:</strong>
[
&nbsp; &quot;Science &nbsp;is &nbsp;what we&quot;,
  &quot;understand &nbsp; &nbsp; &nbsp;well&quot;,
&nbsp; &quot;enough to explain to&quot;,
&nbsp; &quot;a &nbsp;computer. &nbsp;Art is&quot;,
&nbsp; &quot;everything &nbsp;else &nbsp;we&quot;,
&nbsp; &quot;do &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&quot;
]</pre>

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

<ul>
	<li><code>1 &lt;= words.length &lt;= 300</code></li>
	<li><code>1 &lt;= words[i].length &lt;= 20</code></li>
	<li><code>words[i]</code> consists of only English letters and symbols.</li>
	<li><code>1 &lt;= maxWidth &lt;= 100</code></li>
	<li><code>words[i].length &lt;= maxWidth</code></li>
</ul>

class Solution:
    def fullJustify(self, words: List[str], maxWidth: int) -> List[str]:
        n = len(words)
        new = []
        # each line para.
        line = [words[0]]
        l = len(words[0])
        j = 1 # count 
        for i in range(1, n):
            if l+len(words[i])+1 <= maxWidth:
                l = l + len(words[i])+1
                line.append(words[i])
                j += 1
            else:
                res = maxWidth - l
                m = 0
                while res>0:
                    line[m] = line[m]+" "
                    res -= 1
                    if m < j-2:
                        m += 1
                    else:
                        m = 0
                new.append(" ".join(line))
                line = [words[i]]
                l = len(words[i])
                j = 1

        # special treatment for -1 element
        new.append(" ".join(line))
        res = maxWidth - l
        for i in range(res):
            new[-1] += " "

        return new
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