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diff --git a/problems/0392.判断子序列.md b/problems/0392.判断子序列.md
Original file line number	Diff line number	Diff line change
Expand Up		@@ -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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