diff --git a/codes/rust/chapter_computational_complexity/worst_best_time_complexity.rs b/codes/rust/chapter_computational_complexity/worst_best_time_complexity.rs
new file mode 100644
index 00000000..23c2d646
--- /dev/null
+++ b/codes/rust/chapter_computational_complexity/worst_best_time_complexity.rs
@@ -0,0 +1,43 @@
+//   rand = "0.8.5"
+/**
+ * File: time_complexity.cpp
+ * Created Time: 2023-01-13
+ * Author: xBLACICEx (xBLACKICEx@outlook.com )
+ */
+
+// to compilse and run this singile file need:
+// 1. cargo install cargo-single
+// 2. cargo single run worst_best_time_complexity.rs
+
+use rand::seq::SliceRandom;
+use rand::thread_rng;
+
+/* 生成一个数组，元素为 { 1, 2, ..., n }，顺序被打乱 */
+fn random_numbers(n: i32) -> Vec<i32> {
+    // 生成数组 nums = { 1, 2, 3, ..., n }
+    let mut nums = (1..n + 1).collect::<Vec<i32>>();
+    // 随机打乱数组元素
+    nums.shuffle(&mut thread_rng());
+    nums
+}
+
+/* 查找数组 nums 中数字 1 所在索引 */
+fn find_one(nums: &[i32]) -> Option<usize> {
+    for i in 0..nums.len() {
+        if nums[i] == 1 {
+            return Some(i);
+        }
+    }
+    None
+}
+
+/* Driver Code */
+fn main() {
+    for _ in 0..10 {
+        let n = 100;
+        let nums = random_numbers(n);
+        let index = find_one(&nums);
+        println!("\n数组 [ 1, 2, ..., n ] 被打乱后 = {:?}", nums);
+        println!("数字 1 的索引为 {:?}", index);
+    }
+}
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