<p>Given an array of strings <code>strs</code>, group the <span data-keyword="anagram">anagrams</span> together. You can return the answer in <strong>any order</strong>.</p>

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

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">strs = [&quot;eat&quot;,&quot;tea&quot;,&quot;tan&quot;,&quot;ate&quot;,&quot;nat&quot;,&quot;bat&quot;]</span></p>

<p><strong>Output:</strong> <span class="example-io">[[&quot;bat&quot;],[&quot;nat&quot;,&quot;tan&quot;],[&quot;ate&quot;,&quot;eat&quot;,&quot;tea&quot;]]</span></p>

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

<ul>
	<li>There is no string in strs that can be rearranged to form <code>&quot;bat&quot;</code>.</li>
	<li>The strings <code>&quot;nat&quot;</code> and <code>&quot;tan&quot;</code> are anagrams as they can be rearranged to form each other.</li>
	<li>The strings <code>&quot;ate&quot;</code>, <code>&quot;eat&quot;</code>, and <code>&quot;tea&quot;</code> are anagrams as they can be rearranged to form each other.</li>
</ul>
</div>

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

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">strs = [&quot;&quot;]</span></p>

<p><strong>Output:</strong> <span class="example-io">[[&quot;&quot;]]</span></p>
</div>

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

<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">strs = [&quot;a&quot;]</span></p>

<p><strong>Output:</strong> <span class="example-io">[[&quot;a&quot;]]</span></p>
</div>

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

<ul>
	<li><code>1 &lt;= strs.length &lt;= 10<sup>4</sup></code></li>
	<li><code>0 &lt;= strs[i].length &lt;= 100</code></li>
	<li><code>strs[i]</code> consists of lowercase English letters.</li>
</ul>

class Solution {
public:
    string newfunc(string &str){
        int arr[26]={0};
        for(int i=0; i<str.length(); i++){
            int index=str[i]-'a';
            arr[index]++;
        }    
        string aux="";
        for(int i=0;i<26;i++){
            aux+=to_string(arr[i]);
            aux+=char('a'+i);
        }
        return aux;
    }
   std::array<int,256> hash(string &str){
    std::array<int,256> hash={0};
    for(int i=0; i<str.length(); i++){
        // int index=str[i]-'a';
        hash[str[i]]++;
    }
    return hash;
   }
   
    vector<vector<string>> groupAnagrams(vector<string>& strs) {
        // map<string,vector<string>>mp;
         map<string,vector<string>>mp;

        for(auto str: strs){
            // string s=str;
            // sort(s.begin(),s.end());
            
            mp[newfunc(str)].push_back(str);
        }

        vector<vector<string>>ans;
        for(auto it=mp.begin(); it!=mp.end(); it++){
           ans.push_back(it->second);
        }
        return ans;
    }
};
29203