diff --git a/problems/0763.划分字母区间.md b/problems/0763.划分字母区间.md
index 863b569d..c64ff3c8 100644
--- a/problems/0763.划分字母区间.md
+++ b/problems/0763.划分字母区间.md
@@ -88,15 +88,15 @@ Java：
 class Solution {
     public List<Integer> partitionLabels(String S) {
         List<Integer> list = new LinkedList<>();
-        int[] edge = new int[123];
+        int[] edge = new int[26];
         char[] chars = S.toCharArray();
         for (int i = 0; i < chars.length; i++) {
-            edge[chars[i] - 0] = i;
+            edge[chars[i] - 'a'] = i;
         }
         int idx = 0;
         int last = -1;
         for (int i = 0; i < chars.length; i++) {
-            idx = Math.max(idx,edge[chars[i] - 0]);
+            idx = Math.max(idx,edge[chars[i] - 'a']);
             if (i == idx) {
                 list.add(i - last);
                 last = i;