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Correct my error in Readme.md for 029, and Add Solution and Readme.md for 30[Java]

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我先 merge 啦,后面你方便的话,可以修改一下噢😄

words = ["word","good","good"]
(ps:原题的例子为 words = ["word","student"] 和题目描述不符,这里私自改了一下)
输出: []
```
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😁一点小建议噢,代码块的添加与 LeetCode 保持一致:示例字体加粗,输入输出用代码块包围。
e.g.

示例 1:

输入:
  s = "barfoothefoobarman",
  words = ["foo","bar"]
输出: [0,9]
解释: 从索引 0 和 9 开始的子串分别是 "barfoor" 和 "foobar" 。
输出的顺序不重要, [9,0] 也是有效答案。

示例 2:

输入:
  s = "wordgoodstudentgoodword",
  words = ["word","student"]
输出: []

if(s.length() == 0 || words[0].length() == 0 || s.length() < words.length * words[0].length()) {
return re;
}
// 用< 单词,出现次数 > 来存储 words 中的元素,方便查找
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注释的缩进与代码保持一致~

if(map.containsKey(tempStr)) {
HashMap<String,Integer> searched = new HashMap<>();
// 从后向前依次对比
int tempIndex = j + lastStart;
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这里缩进得有点多噢~是不是贴过来的时候乱了(⊙o⊙)?

后面代码注释也有缩进的问题。

@yanglbme yanglbme merged commit baf4776 into doocs:master Oct 26, 2018
@yanglbme yanglbme added the need optimization Improvement request label Oct 26, 2018
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