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0063-unique-paths-ii/README.md

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+<h2><a href="https://leetcode.com/problems/unique-paths-ii/">63. Unique Paths II</a></h2><h3>Medium</h3><hr><div><p>You are given an <code>m x n</code> integer array <code>grid</code>. There is a robot initially located at the <b>top-left corner</b> (i.e., <code>grid[0][0]</code>). The robot tries to move to the <strong>bottom-right corner</strong> (i.e., <code>grid[m - 1][n - 1]</code>). The robot can only move either down or right at any point in time.</p>
+
+<p>An obstacle and space are marked as <code>1</code> or <code>0</code> respectively in <code>grid</code>. A path that the robot takes cannot include <strong>any</strong> square that is an obstacle.</p>
+
+<p>Return <em>the number of possible unique paths that the robot can take to reach the bottom-right corner</em>.</p>
+
+<p>The testcases are generated so that the answer will be less than or equal to <code>2 * 10<sup>9</sup></code>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2020/11/04/robot1.jpg" style="width: 242px; height: 242px;">
+<pre><strong>Input:</strong> obstacleGrid = [[0,0,0],[0,1,0],[0,0,0]]
+<strong>Output:</strong> 2
+<strong>Explanation:</strong> There is one obstacle in the middle of the 3x3 grid above.
+There are two ways to reach the bottom-right corner:
+1. Right -&gt; Right -&gt; Down -&gt; Down
+2. Down -&gt; Down -&gt; Right -&gt; Right
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+<img alt="" src="https://assets.leetcode.com/uploads/2020/11/04/robot2.jpg" style="width: 162px; height: 162px;">
+<pre><strong>Input:</strong> obstacleGrid = [[0,1],[0,0]]
+<strong>Output:</strong> 1
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>m == obstacleGrid.length</code></li>
+	<li><code>n == obstacleGrid[i].length</code></li>
+	<li><code>1 &lt;= m, n &lt;= 100</code></li>
+	<li><code>obstacleGrid[i][j]</code> is <code>0</code> or <code>1</code>.</li>
+</ul>
+</div>