<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 {
public:
    int myAtoi(string s) {
        bool flag = true,b=false;
        string f = "";
        int count = 0;
        for (int i = 0; i < s.length(); i++) {
            if (s[i] == '-' && !count && !b) {
                b=true;
                flag = false;
            } else if (s[i] == ' ' && !count && !b) {
                continue;
            }
                else if(s[i] == '+' && !b && !count){
                    b=true;
                    continue;
                }
             else if ((s[i] - '0') <= 9 && (s[i] - '0') >= 0) {
                f += s[i];
                // flag = true;
                count++;
            } else {
                break;
            }
        }

        string f1 = "";
        bool final = true;
        for (int i = 0; i < f.size(); i++) {
            if (f[i] == 0 && final) {
                continue;
            } else {
                f1 += f[i];
                final = false;
            }
        }
        if (f1.empty())
            return 0;
        long long ans = 0;
        // cout<<f1;
        for (int i = 0; i < f1.size(); i++) {
            if(ans<=INT_MAX){

            ans = (long long)ans * (long long)10 + (long long)(f1[i] - '0');
            }
        }
        if (!flag){
            ans *= -1;
            ans = max(ans , (long long) INT_MIN);
        }
        else{
            ans = min(ans , (long long) INT_MAX);
        }
        return (int)ans;
    }
};

   
        
    
        
      
        
        
   
        
        
       
           
         
      
            
           
        
        
        
        
        
       
      
          
            
              
            
        
         
        
        
   
       
           
        
        
      

        
        
      
    







      














      
      
      
       
         
        
      
         
        
      
         
          
        
   
         
        
        
           
       
      
    
         
          
            
        
    
     
        
      
        
            
            
       
                
            
        
      
        
                
               
                
                   
                     
     
                           
                        
           
                    
                
                   
                    
                   
                   
                    
                
            
      
           
               
             
                  
                     
                       
                           
                        
             
                   
               
                  
                    
                 
                    
                    
                
            
       
      
       
       
       

       
    


   
       
       
       
       
      
            
                
              
              
        
               
              
                  
       
             

     

































   
        
     
        
     
      
       
       
        
      
        
           
        
     
           
       
        
        

    
        

        
      
               
               
            
           
           
        
        
        
       
          
       
        
      
       
       
        
       
    

  
        
    

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