feat: add rust solution to lc problem: No.0561

No.0561.Array Partition I

Author: YangFong

solution/0500-0599/0561.Array Partition I/README.md

@@ -93,6 +93,24 @@ var arrayPairSum = function (nums) {
 };
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn array_pair_sum(mut nums: Vec<i32>) -> i32 {
+        nums.sort();
+        let n = nums.len();
+        let mut i = 0;
+        let mut res = 0;
+        while i < n {
+            res += nums[i];
+            i += 2;
+        }
+        res
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0500-0599/0561.Array Partition I/README_EN.md

@@ -79,6 +79,24 @@ var arrayPairSum = function (nums) {
 };
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn array_pair_sum(mut nums: Vec<i32>) -> i32 {
+        nums.sort();
+        let n = nums.len();
+        let mut i = 0;
+        let mut res = 0;
+        while i < n {
+            res += nums[i];
+            i += 2;
+        }
+        res
+    }
+}
+```
+
 ### **...**
 
 ```

solution/0500-0599/0561.Array Partition I/Solution.rs

@@ -0,0 +1,13 @@
+impl Solution {
+    pub fn array_pair_sum(mut nums: Vec<i32>) -> i32 {
+        nums.sort();
+        let n = nums.len();
+        let mut i = 0;
+        let mut res = 0;
+        while i < n {
+            res += nums[i];
+            i += 2;
+        }
+        res
+    }
+}