diff --git a/rust/0217-contains-duplicate.rs b/rust/0217-contains-duplicate.rs
index 985d8793d..cec5def26 100644
--- a/rust/0217-contains-duplicate.rs
+++ b/rust/0217-contains-duplicate.rs
@@ -3,16 +3,13 @@ use std::collections::HashSet;
 impl Solution {
     pub fn contains_duplicate(nums: Vec<i32>) -> bool {
         let mut map = HashSet::new();
-        
-        for &n in nums.iter(){
 
-            if map.contains(&n){
-                return true; 
+        for n in nums {
+            if !map.insert(n){
+                return true;
             }
-            
-            map.insert(n);          
-        };        
-        
+        }
+
         false
     }
 }