<p>Given a string <code>queryIP</code>, return <code>&quot;IPv4&quot;</code> if IP is a valid IPv4 address, <code>&quot;IPv6&quot;</code> if IP is a valid IPv6 address or <code>&quot;Neither&quot;</code> if IP is not a correct IP of any type.</p>

<p><strong>A valid IPv4</strong> address is an IP in the form <code>&quot;x<sub>1</sub>.x<sub>2</sub>.x<sub>3</sub>.x<sub>4</sub>&quot;</code> where <code>0 &lt;= x<sub>i</sub> &lt;= 255</code> and <code>x<sub>i</sub></code> <strong>cannot contain</strong> leading zeros. For example, <code>&quot;192.168.1.1&quot;</code> and <code>&quot;192.168.1.0&quot;</code> are valid IPv4 addresses while <code>&quot;192.168.01.1&quot;</code>, <code>&quot;192.168.1.00&quot;</code>, and <code>&quot;192.168@1.1&quot;</code> are invalid IPv4 addresses.</p>

<p><strong>A valid IPv6</strong> address is an IP in the form <code>&quot;x<sub>1</sub>:x<sub>2</sub>:x<sub>3</sub>:x<sub>4</sub>:x<sub>5</sub>:x<sub>6</sub>:x<sub>7</sub>:x<sub>8</sub>&quot;</code> where:</p>

<ul>
	<li><code>1 &lt;= x<sub>i</sub>.length &lt;= 4</code></li>
	<li><code>x<sub>i</sub></code> is a <strong>hexadecimal string</strong> which may contain digits, lowercase English letter (<code>&#39;a&#39;</code> to <code>&#39;f&#39;</code>) and upper-case English letters (<code>&#39;A&#39;</code> to <code>&#39;F&#39;</code>).</li>
	<li>Leading zeros are allowed in <code>x<sub>i</sub></code>.</li>
</ul>

<p>For example, &quot;<code>2001:0db8:85a3:0000:0000:8a2e:0370:7334&quot;</code> and &quot;<code>2001:db8:85a3:0:0:8A2E:0370:7334&quot;</code> are valid IPv6 addresses, while &quot;<code>2001:0db8:85a3::8A2E:037j:7334&quot;</code> and &quot;<code>02001:0db8:85a3:0000:0000:8a2e:0370:7334&quot;</code> are invalid IPv6 addresses.</p>

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

<pre>
<strong>Input:</strong> queryIP = &quot;172.16.254.1&quot;
<strong>Output:</strong> &quot;IPv4&quot;
<strong>Explanation:</strong> This is a valid IPv4 address, return &quot;IPv4&quot;.
</pre>

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

<pre>
<strong>Input:</strong> queryIP = &quot;2001:0db8:85a3:0:0:8A2E:0370:7334&quot;
<strong>Output:</strong> &quot;IPv6&quot;
<strong>Explanation:</strong> This is a valid IPv6 address, return &quot;IPv6&quot;.
</pre>

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

<pre>
<strong>Input:</strong> queryIP = &quot;256.256.256.256&quot;
<strong>Output:</strong> &quot;Neither&quot;
<strong>Explanation:</strong> This is neither a IPv4 address nor a IPv6 address.
</pre>

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

<ul>
	<li><code>queryIP</code> consists only of English letters, digits and the characters <code>&#39;.&#39;</code> and <code>&#39;:&#39;</code>.</li>
</ul>

class Solution {
public:
    string validIPAddress(string queryIP) {
        if(isIpV4(queryIP)) return "IPv4";
        if(isIpV6(queryIP)) return "IPv6";
        return "Neither";
    }
    
private:
    bool isIpV4(string queryIP){
        int i=0;
        int cd = 0;
        int temp_size =0;
        while(i<queryIP.size()){
            string temp = "";
            temp_size =0;
            char ch = queryIP[i];
            while(i<queryIP.size() && queryIP[i]!='.'){
                temp_size++;
                ch = queryIP[i];
                if(!(ch>='0' && ch<='9'))return false;
                temp+=ch;
                i++;
            }
            if(queryIP[i]=='.' && i==queryIP.size()-1)return false;
            i++;
            if((temp_size == 0 )|| temp_size>3||temp[0]=='0' && temp_size>1) return false;
            cd++;
            int val = stoi(temp);
            if(val<0 || val>255)return false;
        }
        if(cd-1!=3)return false;
        return true;
    }

    
    bool isIpV6(string queryIP){
        int i=0;
        int cd = 0;
        
        while(i<queryIP.size()){
            string temp = "";
            int temp_size =0;
            while(i<queryIP.size() && queryIP[i]!=':'){
                temp_size++;
                char ch = queryIP[i];
                if(!((ch>='0' && ch<='9')||(ch>='a' && ch<='f')||(ch>='A' && ch<='F')))return false;
                temp = temp+ch;
                i++;
            }
            if(queryIP[i]==':' && i==queryIP.size()-1)return false;
            i++;
            if(temp_size==0 || temp_size>4)return false;
            cd++;
            
            
        }
        if(cd-1!=7)return false;
        return true;
       
        
    }

};
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