HDOJ 4747 Mex

  非常好的線段樹題。。。。此題必定會火。。。。。 Mex Time Limit: 15000/5000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others) Total Submission(s): 955    Accepted Submission(s): 320 Problem Description Mex is a

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