update

leetcode/problem/stone-game.html

@@ -0,0 +1,38 @@
+<p>Alice and Bob play a game with piles of stones. There are an <strong>even</strong> number of piles arranged in a row, and each pile has a <strong>positive</strong> integer number of stones <code>piles[i]</code>.</p>
+
+<p>The objective of the game is to end with the most stones. The <strong>total</strong> number of stones across all the piles is <strong>odd</strong>, so there are no ties.</p>
+
+<p>Alice and Bob take turns, with <strong>Alice starting first</strong>. Each turn, a player takes the entire pile of stones either from the <strong>beginning</strong> or from the <strong>end</strong> of the row. This continues until there are no more piles left, at which point the person with the <strong>most stones wins</strong>.</p>
+
+<p>Assuming Alice and Bob play optimally, return <code>true</code><em> if Alice wins the game, or </em><code>false</code><em> if Bob wins</em>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> piles = [5,3,4,5]
+<strong>Output:</strong> true
+<strong>Explanation:</strong> 
+Alice starts first, and can only take the first 5 or the last 5.
+Say she takes the first 5, so that the row becomes [3, 4, 5].
+If Bob takes 3, then the board is [4, 5], and Alice takes 5 to win with 10 points.
+If Bob takes the last 5, then the board is [3, 4], and Alice takes 4 to win with 9 points.
+This demonstrated that taking the first 5 was a winning move for Alice, so we return true.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> piles = [3,7,2,3]
+<strong>Output:</strong> true
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>2 &lt;= piles.length &lt;= 500</code></li>
+	<li><code>piles.length</code> is <strong>even</strong>.</li>
+	<li><code>1 &lt;= piles[i] &lt;= 500</code></li>
+	<li><code>sum(piles[i])</code> is <strong>odd</strong>.</li>
+</ul>