Update 0844.比较含退格的字符串.md

problems/0844.比较含退格的字符串.md

@@ -565,7 +565,27 @@ impl Solution {
 }
 ```
 
+> 双栈法
 
+```rust
+impl Solution {
+    pub fn backspace_compare(s: String, t: String) -> bool {
+        Self::get_string(s) == Self::get_string(t)
+    }
+
+    pub fn get_string(string: String) -> String {
+        let mut s = String::new();
+        for c in string.chars() {
+            if c != '#' {
+                s.push(c);
+            } else if !s.is_empty() {
+                s.pop();
+            }
+        }
+        s
+    }
+}
+```
 
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