Merge pull request #1529 from cezarbbb/Backtracking03

添加 0078.子集 Rust版本

problems/0078.子集.md

@@ -292,6 +292,30 @@ function subsets(nums: number[]): number[][] {
 };
 ```
 
+## Rust
+
+```Rust
+impl Solution {
+    fn backtracking(result: &mut Vec<Vec<i32>>, path: &mut Vec<i32>, nums: &Vec<i32>, start_index: usize) {
+        result.push(path.clone());
+        let len = nums.len();
+        // if start_index >= len { return; }
+        for i in start_index..len {
+            path.push(nums[i]);
+            Self::backtracking(result, path, nums, i + 1);
+            path.pop();
+        }
+    }
+
+    pub fn subsets(nums: Vec<i32>) -> Vec<Vec<i32>> {
+        let mut result: Vec<Vec<i32>> = Vec::new();
+        let mut path: Vec<i32> = Vec::new();
+        Self::backtracking(&mut result, &mut path, &nums, 0);
+        result
+    }
+}
+```
+
 ## C
 
 ```c