update

leetcode/problem/reaching-points.html

@@ -0,0 +1,37 @@
+<p>Given four integers <code>sx</code>, <code>sy</code>, <code>tx</code>, and <code>ty</code>, return <code>true</code><em> if it is possible to convert the point </em><code>(sx, sy)</code><em> to the point </em><code>(tx, ty)</code> <em>through some operations</em><em>, or </em><code>false</code><em> otherwise</em>.</p>
+
+<p>The allowed operation on some point <code>(x, y)</code> is to convert it to either <code>(x, x + y)</code> or <code>(x + y, y)</code>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> sx = 1, sy = 1, tx = 3, ty = 5
+<strong>Output:</strong> true
+<strong>Explanation:</strong>
+One series of moves that transforms the starting point to the target is:
+(1, 1) -&gt; (1, 2)
+(1, 2) -&gt; (3, 2)
+(3, 2) -&gt; (3, 5)
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> sx = 1, sy = 1, tx = 2, ty = 2
+<strong>Output:</strong> false
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre>
+<strong>Input:</strong> sx = 1, sy = 1, tx = 1, ty = 1
+<strong>Output:</strong> true
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= sx, sy, tx, ty &lt;= 10<sup>9</sup></code></li>
+</ul>