Update LongestConsecutiveSequence.java

Line 42: cannot find symbol: variable flag_true

Submission Result: Compile Error

Line 49: incompatible types

Submission Result: Compile Error

Line 49: cannot find symbol: class Collection

Submission Result: Runtime Error

Last executed input:	[0]

Submission Result: Wrong Answer

Input:	[0,0,1,-1]
Output:	2
Expected:	3