Merge pull request #1535 from cezarbbb/Backtracking06

添加 0046.全排列 Rust版本

problems/0046.全排列.md

@@ -359,6 +359,36 @@ function permute(nums: number[]): number[][] {
 };
 ```
 
+### Rust
+
+```Rust
+impl Solution {
+    fn backtracking(result: &mut Vec<Vec<i32>>, path: &mut Vec<i32>, nums: &Vec<i32>, used: &mut Vec<bool>) {
+        let len = nums.len();
+        if path.len() == len {
+            result.push(path.clone());
+            return;
+        }
+        for i in 0..len {
+            if used[i] == true { continue; }
+            used[i] = true;
+            path.push(nums[i]);
+            Self::backtracking(result, path, nums, used);
+            path.pop();
+            used[i] = false;
+        }
+    }
+
+    pub fn permute(nums: Vec<i32>) -> Vec<Vec<i32>> {
+        let mut result: Vec<Vec<i32>> = Vec::new();
+        let mut path: Vec<i32> = Vec::new();
+        let mut used = vec![false; nums.len()];
+        Self::backtracking(&mut result, &mut path, &nums, &mut used);
+        result
+    }
+}
+```
+
 ### C
 
 ```c