diff --git a/problems/0763.划分字母区间.md b/problems/0763.划分字母区间.md
index ad680ef9..fbcafdc8 100644
--- a/problems/0763.划分字母区间.md
+++ b/problems/0763.划分字母区间.md
@@ -412,28 +412,22 @@ object Solution {
 ### Rust
 
 ```Rust
-use std::collections::HashMap;
 impl Solution {
-    fn max (a: usize, b: usize) -> usize {
-        if a > b { a } else { b }
-    }
     pub fn partition_labels(s: String) -> Vec<i32> {
-        let s = s.chars().collect::<Vec<char>>();
-        let mut hash: HashMap<char, usize> = HashMap::new();
-        for i in 0..s.len() {
-            hash.insert(s[i], i);
+        let mut hash = vec![0; 26];
+        for (i, &c) in s.as_bytes().iter().enumerate() {
+            hash[(c - b'a') as usize] = i;
         }
-        let mut result: Vec<i32> = Vec::new();
-        let mut left: usize = 0;
-        let mut right: usize = 0;
-        for i in 0..s.len() {
-            right = Self::max(right, hash[&s[i]]);
+        let mut res = vec![];
+        let (mut left, mut right) = (0, 0);
+        for (i, &c) in s.as_bytes().iter().enumerate() {
+            right = right.max(hash[(c - b'a') as usize]);
             if i == right {
-                result.push((right - left + 1) as i32);
+                res.push((right - left + 1) as i32);
                 left = i + 1;
             }
         }
-        result
+        res
     }
 }
 ```