<p>Given two strings <code>ransomNote</code> and <code>magazine</code>, return <code>true</code><em> if </em><code>ransomNote</code><em> can be constructed by using the letters from </em><code>magazine</code><em> and </em><code>false</code><em> otherwise</em>.</p>

<p>Each letter in <code>magazine</code> can only be used once in <code>ransomNote</code>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre><strong>Input:</strong> ransomNote = "a", magazine = "b"
<strong>Output:</strong> false
</pre><p><strong class="example">Example 2:</strong></p>
<pre><strong>Input:</strong> ransomNote = "aa", magazine = "ab"
<strong>Output:</strong> false
</pre><p><strong class="example">Example 3:</strong></p>
<pre><strong>Input:</strong> ransomNote = "aa", magazine = "aab"
<strong>Output:</strong> true
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= ransomNote.length, magazine.length &lt;= 10<sup>5</sup></code></li>
	<li><code>ransomNote</code> and <code>magazine</code> consist of lowercase English letters.</li>
</ul>

class Solution {
public:
    bool canConstruct(string ransomNote, string magazine) {
        unordered_map<char,int> map;
        for(int i = 0;i<magazine.size();i++){
            map[magazine[i]]++;
        }
        for(int i = 0;i<ransomNote.size();i++){
            if(map[ransomNote[i]]){
                map[ransomNote[i]]--;
            }else{
                return false;
            }
        }
        return true;
    }
};
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