From 872402e5a4e2e227e889fd3103786c503f864abd Mon Sep 17 00:00:00 2001
From: fw_qaq <fwqaaq@gmail.com>
Date: Thu, 13 Apr 2023 18:05:44 +0800
Subject: [PATCH] =?UTF-8?q?Update=200063.=E4=B8=8D=E5=90=8C=E8=B7=AF?=
 =?UTF-8?q?=E5=BE=84II.md?=
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---
 problems/0063.不同路径II.md | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/problems/0063.不同路径II.md b/problems/0063.不同路径II.md
index 85130ab4..8ab90e6d 100644
--- a/problems/0063.不同路径II.md
+++ b/problems/0063.不同路径II.md
@@ -493,6 +493,34 @@ impl Solution {
 }
 ```
 
+空间优化：
+
+```rust
+impl Solution {
+    pub fn unique_paths_with_obstacles(obstacle_grid: Vec<Vec<i32>>) -> i32 {
+        let mut dp = vec![0; obstacle_grid[0].len()];
+        for (i, &v) in obstacle_grid[0].iter().enumerate() {
+            if v == 0 {
+                dp[i] = 1;
+            } else {
+                break;
+            }
+        }
+        for rows in obstacle_grid.iter().skip(1) {
+            for j in 0..rows.len() {
+                if rows[j] == 1 {
+                    dp[j] = 0;
+                    continue;
+                } else if j != 0 {
+                    dp[j] += dp[j - 1];
+                }
+            }
+        }
+        dp.pop().unwrap()
+    }
+}
+```
+
 ### C
 
 ```c