Update 0392.判断子序列.md

problems/0392.判断子序列.md

@@ -278,6 +278,30 @@ impl Solution {
 }
 ```
 
+> 滚动数组
+
+```rust
+impl Solution {
+    pub fn is_subsequence(s: String, t: String) -> bool {
+        let mut dp = vec![0; t.len() + 1];
+        let (s, t) = (s.as_bytes(), t.as_bytes());
+        for &byte_s in s {
+            let mut pre = 0;
+            for j in 0..t.len() {
+                let temp = dp[j + 1];
+                if byte_s == t[j] {
+                    dp[j + 1] = pre + 1;
+                } else {
+                    dp[j + 1] = dp[j];
+                }
+                pre = temp;
+            }
+        }
+        dp[t.len()] == s.len()
+    }
+}
+```
+
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