<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) {
        vector<string> v1;
        vector<string> v2;
        string s="";
        int i;
        for (i=0;i<queryIP.size();i=i+1)
        {
            if (queryIP[i]=='.')
            {
                v1.push_back(s);
                s="";
            }
            else if (queryIP[i]==':')
            {
                v2.push_back(s);
                s="";
            }
            else
            {
                s=s+queryIP[i];
            }
        }
        v1.push_back(s);
        v2.push_back(s);
        if (v1.size()==4)
        {
            set<char> s1;
            int j;
            s1.insert('1');
            s1.insert('2');
            s1.insert('3');
            s1.insert('4');
            s1.insert('5');
            s1.insert('6');
            s1.insert('7');
            s1.insert('8');
            s1.insert('9');
            s1.insert('0');
            for (i=0;i<4;i=i+1)
            {
                if (v1[i]=="")
                {
                    return "Neither";
                }
                for (j=0;j<v1[i].size();j=j+1)
                {
                    if (find(s1.begin(),s1.end(),v1[i][j])==s1.end() or j>2)
                    {
                        return "Neither";
                    }
                }
                if (stoi(v1[i])>255 or ((to_string(stoi(v1[i])).size())!=(v1[i].size())))
                {
                    return "Neither";
                }
            }
            return "IPv4";
        }
        else if (v2.size()==8)
        {
            set<char> s1;
            int j;
            s1.insert('a');
            s1.insert('b');
            s1.insert('c');
            s1.insert('d');
            s1.insert('e');
            s1.insert('f');
            s1.insert('1');
            s1.insert('2');
            s1.insert('3');
            s1.insert('4');
            s1.insert('5');
            s1.insert('6');
            s1.insert('7');
            s1.insert('8');
            s1.insert('9');
            s1.insert('0');
            s1.insert('A');
            s1.insert('B');
            s1.insert('C');
            s1.insert('D');
            s1.insert('E');
            s1.insert('F');
            for (i=0;i<8;i=i+1)
            {
                if (v2[i]=="")
                {
                    return "Neither";
                }
                for (j=0;j<v2[i].size();j=j+1)
                {
                    if (find(s1.begin(),s1.end(),v2[i][j])==s1.end() or j>3)
                    {
                        return "Neither";
                    }
                }
            }
            return "IPv6";
        }
        else
        {
            return "Neither";
        }
        return "";
    }
};
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