feat: add rust solution to lc problem: No.3392 (#4375)

No.3392.Count Subarrays of Length Three With a Condition

solution/3300-3399/3392.Count Subarrays of Length Three With a Condition/README.md

@@ -143,6 +143,22 @@ function countSubarrays(nums: number[]): number {
 }
 ```
 
+#### Rust
+
+```rust
+impl Solution {
+    pub fn count_subarrays(nums: Vec<i32>) -> i32 {
+        let mut ans = 0;
+        for i in 1..nums.len() - 1 {
+            if (nums[i - 1] + nums[i + 1]) * 2 == nums[i] {
+                ans += 1;
+            }
+        }
+        ans
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/3300-3399/3392.Count Subarrays of Length Three With a Condition/README_EN.md

@@ -139,6 +139,22 @@ function countSubarrays(nums: number[]): number {
 }
 ```
 
+#### Rust
+
+```rust
+impl Solution {
+    pub fn count_subarrays(nums: Vec<i32>) -> i32 {
+        let mut ans = 0;
+        for i in 1..nums.len() - 1 {
+            if (nums[i - 1] + nums[i + 1]) * 2 == nums[i] {
+                ans += 1;
+            }
+        }
+        ans
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/3300-3399/3392.Count Subarrays of Length Three With a Condition/Solution.rs

@@ -0,0 +1,11 @@
+impl Solution {
+    pub fn count_subarrays(nums: Vec<i32>) -> i32 {
+        let mut ans = 0;
+        for i in 1..nums.len() - 1 {
+            if (nums[i - 1] + nums[i + 1]) * 2 == nums[i] {
+                ans += 1;
+            }
+        }
+        ans
+    }
+}