Commit 28be855

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Add Solution2.java to problems 0003

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Original file line number	Diff line number	Diff line change
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	`1`	`+class Solution {`
	`2`	`+ public int lengthOfLongestSubstring(String s) {`
	`3`	`+ int i = 0, j = 0, length = s.length(), max = 0;`
	`4`	`+ Set<Character> set = new HashSet<>();`
	`5`	`+ while (i < length && j < length) {`
	`6`	`+ if (!set.contains(s.charAt(i))) {`
	`7`	`+ set.add(s.charAt(i++));`
	`8`	`+ max = Math.max(max, i - j);`
	`9`	`+ } else set.remove(s.charAt(j++));`
	`10`	`+ }`
	`11`	`+ return max;`
	`12`	`+ }`
	`13`	`+}`

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