feat: add rust solution to lc problem: No.2558 (doocs#1224)

Author: dierbei

solution/2500-2599/2558.Take Gifts From the Richest Pile/README.md

@@ -144,6 +144,30 @@ func (hp) Pop() (_ interface{}) { return }
 func (hp) Push(interface{})     {}
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn pick_gifts(gifts: Vec<i32>, k: i32) -> i64 {
+        let mut h = std::collections::BinaryHeap::from(gifts);
+        let mut ans = 0;
+
+        for _ in 0..k {
+            if let Some(mut max_gift) = h.pop() {
+                max_gift = (max_gift as f64).sqrt().floor() as i32;
+                h.push(max_gift);
+            }
+        }
+
+        for x in h {
+            ans += x as i64;
+        }
+
+        ans
+    }
+}
+```
+
 ### **...**
 
 ```

solution/2500-2599/2558.Take Gifts From the Richest Pile/README_EN.md

@@ -126,6 +126,30 @@ func (hp) Pop() (_ interface{}) { return }
 func (hp) Push(interface{})     {}
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn pick_gifts(gifts: Vec<i32>, k: i32) -> i64 {
+        let mut h = std::collections::BinaryHeap::from(gifts);
+        let mut ans = 0;
+
+        for _ in 0..k {
+            if let Some(mut max_gift) = h.pop() {
+                max_gift = (max_gift as f64).sqrt().floor() as i32;
+                h.push(max_gift);
+            }
+        }
+
+        for x in h {
+            ans += x as i64;
+        }
+
+        ans
+    }
+}
+```
+
 ### **...**
 
 ```

solution/2500-2599/2558.Take Gifts From the Richest Pile/Solution.rs

@@ -0,0 +1,19 @@
+impl Solution {
+    pub fn pick_gifts(gifts: Vec<i32>, k: i32) -> i64 {
+        let mut h = std::collections::BinaryHeap::from(gifts);
+        let mut ans = 0;
+
+        for _ in 0..k {
+            if let Some(mut max_gift) = h.pop() {
+                max_gift = (max_gift as f64).sqrt().floor() as i32;
+                h.push(max_gift);
+            }
+        }
+
+        for x in h {
+            ans += x as i64;
+        }
+
+        ans
+    }
+}