ZOJ1457 DFS 素數環

原創 x___song 2020-06-20 15:42

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=457


DFS

給定n（n < 20

求所有情況的素數環


經典深搜


需要注意的是 當n是奇數的時候是不會有素數環的出現

所以要判斷n是否是偶數


剛開始做的時候只是把素數表打到20 但是後來發現應該打到40（20+19極端情況

結果無奈的的wa了幾次


後來沒有判斷奇數偶數 又tle幾次

要細心


ac代碼

http://paste.ubuntu.com/9295325/

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