<p>A <strong>valid IP address</strong> consists of exactly four integers separated by single dots. Each integer is between <code>0</code> and <code>255</code> (<strong>inclusive</strong>) and cannot have leading zeros.</p>

<ul>
	<li>For example, <code>&quot;0.1.2.201&quot;</code> and <code>&quot;192.168.1.1&quot;</code> are <strong>valid</strong> IP addresses, but <code>&quot;0.011.255.245&quot;</code>, <code>&quot;192.168.1.312&quot;</code> and <code>&quot;192.168@1.1&quot;</code> are <strong>invalid</strong> IP addresses.</li>
</ul>

<p>Given a string <code>s</code> containing only digits, return <em>all possible valid IP addresses that can be formed by inserting dots into </em><code>s</code>. You are <strong>not</strong> allowed to reorder or remove any digits in <code>s</code>. You may return the valid IP addresses in <strong>any</strong> order.</p>

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

<pre>
<strong>Input:</strong> s = &quot;25525511135&quot;
<strong>Output:</strong> [&quot;255.255.11.135&quot;,&quot;255.255.111.35&quot;]
</pre>

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

<pre>
<strong>Input:</strong> s = &quot;0000&quot;
<strong>Output:</strong> [&quot;0.0.0.0&quot;]
</pre>

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

<pre>
<strong>Input:</strong> s = &quot;101023&quot;
<strong>Output:</strong> [&quot;1.0.10.23&quot;,&quot;1.0.102.3&quot;,&quot;10.1.0.23&quot;,&quot;10.10.2.3&quot;,&quot;101.0.2.3&quot;]
</pre>

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

<ul>
	<li><code>1 &lt;= s.length &lt;= 20</code></li>
	<li><code>s</code> consists of digits only.</li>
</ul>

class Solution {
public:
vector<string>res;//Handling of starting 0 is remaining


 string dotPutter(string temp, int i){
    int n=temp.length();
    string a=temp.substr(0,i+1)+'.'+temp.substr(i+1);
    return a;

}


bool checker(string temp,int dot){

    int n=temp.length(),i=0,x=0,j=0,num;
    string buf;
    while(j<n&&i<n){
        while(i<n&&temp[i]!='.'){i++;x++;
        }
        if(temp[j]=='0'&&x>1){return false;}
        if(x>3||x==0){return false;}
         buf=temp.substr(j,x);
         num=stoi(buf);
         if(!(num>=0&&num<=255)){return false;}
         j=i+1;
         i++;
         x=0;}
         return true;

  }



void solver(string temp,int leftDots,int k){
    if(leftDots==0){
        if(checker(temp,3)){res.push_back(temp);
    return;}
    
    }

    

      else{  for(int i=k+1;i<temp.length()-1&&i<4+k;i++){
           string newtemp=dotPutter(temp,i);
            //if(checker(newtemp,3-leftDots+1)){
                solver(newtemp,leftDots-1,i+1);
            //};
}}
return;

}














    vector<string> restoreIpAddresses(string s) {
        res.clear();
        
        if(s.length()>12||s.length()<4)return res;
       else{
        solver(s,3,-1);

  }
        
        return res;
        
    }
};
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