the-number-of-weak-characters-in-the-game

The Number of Weak Characters in the Game

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numberOfWeakCharacters

You are playing a game that contains multiple characters, and each of the characters has two main properties: attack and defense. You are given a 2D integer array <code>properties</code> where <code>properties[i] = [attacki, defensei]</code> represents the properties of the <code>ith</code> character in the game.

A character is said to be weak if any other character has both attack and defense levels strictly greater than this character&#39;s attack and defense levels. More formally, a character <code>i</code> is said to be weak if there exists another character <code>j</code> where <code>attackj &gt; attacki</code> and <code>defensej &gt; defensei</code>.

Return the number of weak characters.

&nbsp;
Example 1:

<pre>
Input: properties = [[5,5],[6,3],[3,6]]
Output: 0
Explanation: No character has strictly greater attack and defense than the other.
</pre>

Example 2:

<pre>
Input: properties = [[2,2],[3,3]]
Output: 1
Explanation: The first character is weak because the second character has a strictly greater attack and defense.
</pre>

Example 3:

<pre>
Input: properties = [[1,5],[10,4],[4,3]]
Output: 1
Explanation: The third character is weak because the second character has a strictly greater attack and defense.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>2 &lt;= properties.length &lt;= 105</code></li>
	<li><code>properties[i].length == 2</code></li>
	<li><code>1 &lt;= attacki, defensei &lt;= 105</code></li>
</ul>

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