Update 0070.爬楼梯完全背包版本.md about rust

problems/0070.爬楼梯完全背包版本.md

@@ -225,8 +225,25 @@ function climbStairs(n: number): number {
 };
 ```
 
+Rust:
 
-
+```rust
+impl Solution {
+    pub fn climb_stairs(n: i32) -> i32 {
+        let (n, m) = (n as usize, 2);
+        let mut dp = vec![0; n + 1];
+        dp[0] = 1;
+        for i in 1..=n {
+            for j in 1..=m {
+                if i >= j {
+                    dp[i] += dp[i - j];
+                }
+            }
+        }
+        dp[n]
+    }
+}
+```
 
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