HDU 4556 Stern-Brocot Tree (歐拉函數)

Stern-Brocot Tree Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others) Total Submission(s): 251    Accepted Submission(s): 159 Problem Description         上圖是一棵Stern-Bro
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