<p>Implement the <code>myAtoi(string s)</code> function, which converts a string to a 32-bit signed integer.</p>

<p>The algorithm for <code>myAtoi(string s)</code> is as follows:</p>

<ol>
	<li><strong>Whitespace</strong>: Ignore any leading whitespace (<code>&quot; &quot;</code>).</li>
	<li><strong>Signedness</strong>: Determine the sign by checking if the next character is <code>&#39;-&#39;</code> or <code>&#39;+&#39;</code>, assuming positivity is neither present.</li>
	<li><strong>Conversion</strong>: Read the integer by skipping leading zeros&nbsp;until a non-digit character is encountered or the end of the string is reached. If no digits were read, then the result is 0.</li>
	<li><strong>Rounding</strong>: If the integer is out of the 32-bit signed integer range <code>[-2<sup>31</sup>, 2<sup>31</sup> - 1]</code>, then round the integer to remain in the range. Specifically, integers less than <code>-2<sup>31</sup></code> should be rounded to <code>-2<sup>31</sup></code>, and integers greater than <code>2<sup>31</sup> - 1</code> should be rounded to <code>2<sup>31</sup> - 1</code>.</li>
</ol>

<p>Return the integer as the final result.</p>

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

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;42&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">42</span></p>

<p><strong>Explanation:</strong></p>

<pre>
The underlined characters are what is read in and the caret is the current reader position.
Step 1: &quot;42&quot; (no characters read because there is no leading whitespace)
         ^
Step 2: &quot;42&quot; (no characters read because there is neither a &#39;-&#39; nor &#39;+&#39;)
         ^
Step 3: &quot;<u>42</u>&quot; (&quot;42&quot; is read in)
           ^
</pre>
</div>

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

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot; -042&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">-42</span></p>

<p><strong>Explanation:</strong></p>

<pre>
Step 1: &quot;<u>   </u>-042&quot; (leading whitespace is read and ignored)
            ^
Step 2: &quot;   <u>-</u>042&quot; (&#39;-&#39; is read, so the result should be negative)
             ^
Step 3: &quot;   -<u>042</u>&quot; (&quot;042&quot; is read in, leading zeros ignored in the result)
               ^
</pre>
</div>

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

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;1337c0d3&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">1337</span></p>

<p><strong>Explanation:</strong></p>

<pre>
Step 1: &quot;1337c0d3&quot; (no characters read because there is no leading whitespace)
         ^
Step 2: &quot;1337c0d3&quot; (no characters read because there is neither a &#39;-&#39; nor &#39;+&#39;)
         ^
Step 3: &quot;<u>1337</u>c0d3&quot; (&quot;1337&quot; is read in; reading stops because the next character is a non-digit)
             ^
</pre>
</div>

<p><strong class="example">Example 4:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;0-1&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">0</span></p>

<p><strong>Explanation:</strong></p>

<pre>
Step 1: &quot;0-1&quot; (no characters read because there is no leading whitespace)
         ^
Step 2: &quot;0-1&quot; (no characters read because there is neither a &#39;-&#39; nor &#39;+&#39;)
         ^
Step 3: &quot;<u>0</u>-1&quot; (&quot;0&quot; is read in; reading stops because the next character is a non-digit)
          ^
</pre>
</div>

<p><strong class="example">Example 5:</strong></p>

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">s = &quot;words and 987&quot;</span></p>

<p><strong>Output:</strong> <span class="example-io">0</span></p>

<p><strong>Explanation:</strong></p>

<p>Reading stops at the first non-digit character &#39;w&#39;.</p>
</div>

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

<ul>
	<li><code>0 &lt;= s.length &lt;= 200</code></li>
	<li><code>s</code> consists of English letters (lower-case and upper-case), digits (<code>0-9</code>), <code>&#39; &#39;</code>, <code>&#39;+&#39;</code>, <code>&#39;-&#39;</code>, and <code>&#39;.&#39;</code>.</li>
</ul>

class Solution:
    def myAtoi(self, s: str) -> int:
        s=s.strip()
        # print(s)
        if len(s)==0:
            return 0
        n="1234567890"
        res=""
        neg=False
        if s[0]=="-":
            s=s[1:len(s)]
            neg=True
        elif s[0]=="+":
            s=s[1:len(s)]
        if len(s)==0:
            return 0
        for i in s:
            if i in n:
                if not (i=="0" and len(res)==0):
                    res+=i
            else:
                if len(res)==0:
                    return 0
                break
        if len(res)==0:
            return 0
        if neg:
            res="-"+res
        res=int(res)
        if res<-2**31:
            return -2**31
        if res>((2**31)-1):
            return (2**31)-1
        return res
16400