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View Compilation Error

0_0_24960261_29482\Main.java:1: 错误: 类Solution是公共的, 应在名为 Solution.java 的文件中声明
public class Solution {  
       ^
0_0_24960261_29482\Main.java:2: 错误: 找不到符号
    public int ladderLength(String beginWord, String endWord, Set<String> wordList) {  
                                                              ^
  符号:   类 Set
  位置: 类 Solution
0_0_24960261_29482\Main.java:4: 错误: 找不到符号
        Set<String> reachSet = new HashSet<String>();  
        ^
  符号:   类 Set
  位置: 类 Solution
0_0_24960261_29482\Main.java:4: 错误: 找不到符号
        Set<String> reachSet = new HashSet<String>();  
                                   ^
  符号:   类 HashSet
  位置: 类 Solution
0_0_24960261_29482\Main.java:5: 错误: 找不到符号
        Set<String> nextReachSet = new HashSet<String>();  
        ^
  符号:   类 Set
  位置: 类 Solution
0_0_24960261_29482\Main.java:5: 错误: 找不到符号
        Set<String> nextReachSet = new HashSet<String>();  
                                       ^
  符号:   类 HashSet
  位置: 类 Solution
0_0_24960261_29482\Main.java:33: 错误: 找不到符号
            nextReachSet = new HashSet<String>();  
                               ^
  符号:   类 HashSet
  位置: 类 Solution
7 个错误


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