添加 0017.电话号码的字母组合.md Java版本

HQWQF · May 12, 2021 · c2fd043 · c2fd043
1 parent 5a799c6
commit c2fd043
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/problems/0017.电话号码的字母组合.md b/problems/0017.电话号码的字母组合.md
@@ -242,6 +242,7 @@ public:
 Java：
 ```Java
 class Solution {
+
     //设置全局列表存储最后的结果
     List<String> list = new ArrayList<>();
 
@@ -271,6 +272,7 @@ class Solution {
         String str = numString[digits.charAt(num) - '0'];
         for (int i = 0; i < str.length(); i++) {
             temp.append(str.charAt(i));
+            //回溯
             backTracking(digits, numString, num + 1);
             //剔除末尾的继续尝试
             temp.deleteCharAt(temp.length() - 1);