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<p>一个机器人位于一个 <code>m x n</code><em>&nbsp;</em>网格的左上角 (起始点在下图中标记为 &ldquo;Start&rdquo; )。</p>
<p>机器人每次只能向下或者向右移动一步。机器人试图达到网格的右下角(在下图中标记为 &ldquo;Finish&rdquo; )。</p>
<p>问总共有多少条不同的路径?</p>
<p>&nbsp;</p>
<p><strong>示例 1</strong></p>
<p><img src="https://assets.leetcode.com/uploads/2018/10/22/robot_maze.png" /></p>
<pre>
<strong>输入:</strong>m = 3, n = 7
<strong>输出:</strong>28</pre>
<p><strong>示例 2</strong></p>
<pre>
<strong>输入:</strong>m = 3, n = 2
<strong>输出:</strong>3
<strong>解释:</strong>
从左上角开始,总共有 3 条路径可以到达右下角。
1. 向右 -&gt; 向下 -&gt; 向下
2. 向下 -&gt; 向下 -&gt; 向右
3. 向下 -&gt; 向右 -&gt; 向下
</pre>
<p><strong>示例 3</strong></p>
<pre>
<strong>输入:</strong>m = 7, n = 3
<strong>输出:</strong>28
</pre>
<p><strong>示例 4</strong></p>
<pre>
<strong>输入:</strong>m = 3, n = 3
<strong>输出:</strong>6</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= m, n &lt;= 100</code></li>
<li>题目数据保证答案小于等于 <code>2 * 10<sup>9</sup></code></li>
</ul>
<p>&nbsp;</p>
<p><meta charset="UTF-8" />注意:本题与主站 62&nbsp;题相同:&nbsp;<a href="https://leetcode-cn.com/problems/unique-paths/">https://leetcode-cn.com/problems/unique-paths/</a></p>