feat: add rust solution to lc problem: No.2570 (#1204)

Author: dierbei

solution/2500-2599/2570.Merge Two 2D Arrays by Summing Values/README.md

@@ -182,6 +182,33 @@ function mergeArrays(nums1: number[][], nums2: number[][]): number[][] {
 }
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn merge_arrays(nums1: Vec<Vec<i32>>, nums2: Vec<Vec<i32>>) -> Vec<Vec<i32>> {
+        let mut cnt = vec![0; 1001];
+
+        for x in &nums1 {
+            cnt[x[0] as usize] += x[1];
+        }
+
+        for x in &nums2 {
+            cnt[x[0] as usize] += x[1];
+        }
+
+        let mut ans = vec![];
+        for i in 0..cnt.len() {
+            if cnt[i] > 0 {
+                ans.push(vec![i as i32, cnt[i] as i32]);
+            }
+        }
+
+        ans
+    }
+}
+```
+
 ### **...**
 
 ```

solution/2500-2599/2570.Merge Two 2D Arrays by Summing Values/README_EN.md

@@ -166,6 +166,33 @@ function mergeArrays(nums1: number[][], nums2: number[][]): number[][] {
 }
 ```
 
+### **Rust**
+
+```rust
+impl Solution {
+    pub fn merge_arrays(nums1: Vec<Vec<i32>>, nums2: Vec<Vec<i32>>) -> Vec<Vec<i32>> {
+        let mut cnt = vec![0; 1001];
+
+        for x in &nums1 {
+            cnt[x[0] as usize] += x[1];
+        }
+
+        for x in &nums2 {
+            cnt[x[0] as usize] += x[1];
+        }
+
+        let mut ans = vec![];
+        for i in 0..cnt.len() {
+            if cnt[i] > 0 {
+                ans.push(vec![i as i32, cnt[i] as i32]);
+            }
+        }
+
+        ans
+    }
+}
+```
+
 ### **...**
 
 ```

solution/2500-2599/2570.Merge Two 2D Arrays by Summing Values/Solution.rs

@@ -0,0 +1,22 @@
+impl Solution {
+    pub fn merge_arrays(nums1: Vec<Vec<i32>>, nums2: Vec<Vec<i32>>) -> Vec<Vec<i32>> {
+        let mut cnt = vec![0; 1001];
+
+        for x in &nums1 {
+            cnt[x[0] as usize] += x[1];
+        }
+
+        for x in &nums2 {
+            cnt[x[0] as usize] += x[1];
+        }
+
+        let mut ans = vec![];
+        for i in 0..cnt.len() {
+            if cnt[i] > 0 {
+                ans.push(vec![i as i32, cnt[i] as i32]);
+            }
+        }
+
+        ans
+    }
+}