From 90ff8a8ff85752d865a458d9ff68c41ce9e3de21 Mon Sep 17 00:00:00 2001
From: cezarbbb <105843128+cezarbbb@users.noreply.github.com>
Date: Wed, 20 Jul 2022 15:00:40 +0800
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添加 0491.递增子序列 Rust版本
---
 problems/0491.递增子序列.md | 51 ++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/problems/0491.递增子序列.md b/problems/0491.递增子序列.md
index 080984f2..6a92aa21 100644
--- a/problems/0491.递增子序列.md
+++ b/problems/0491.递增子序列.md
@@ -423,6 +423,57 @@ function findSubsequences(nums: number[]): number[][] {
 };
 ```
 
+### Rust
+**回溯+哈希**
+```Rust
+use std::collections::HashSet;
+impl Solution {
+    fn backtracking(result: &mut Vec<Vec<i32>>, path: &mut Vec<i32>, nums: &Vec<i32>, start_index: usize) {
+        if path.len() > 1 { result.push(path.clone()); }
+        let len = nums.len();
+        let mut uset: HashSet<i32> = HashSet::new();
+        for i in start_index..len {
+            if (!path.is_empty() && nums[i] < *path.last().unwrap()) || uset.contains(&nums[i]) { continue; }
+            uset.insert(nums[i]);
+            path.push(nums[i]);
+            Self::backtracking(result, path, nums, i + 1);
+            path.pop();
+        }
+    }
+
+    pub fn find_subsequences(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
+    }
+}
+```
+**回溯+数组**
+```Rust
+impl Solution {
+    fn backtracking(result: &mut Vec<Vec<i32>>, path: &mut Vec<i32>, nums: &Vec<i32>, start_index: usize) {
+        if path.len() > 1 { result.push(path.clone()); }
+        let len = nums.len();
+        let mut used = [0; 201];
+        for i in start_index..len {
+            if (!path.is_empty() && nums[i] < *path.last().unwrap()) || used[(nums[i] + 100) as usize] == 1 { continue; }
+            used[(nums[i] + 100) as usize] = 1;
+            path.push(nums[i]);
+            Self::backtracking(result, path, nums, i + 1);
+            path.pop();
+        }
+    }
+
+    pub fn find_subsequences(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