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Anarmyofantswalkonahorizontalpoleoflengthlcm,eachwithaconstantspeedof1cm/s.Whenawalkingantreachesanendofthepole,itimmediatellyfallsoffit.Whentwoantsmeettheyturnbackandstartwalkinginoppositedirections.Wekno
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有高度分别为1到n的n根杆子排成一行。如果你从左侧或右侧看这些杆，较小的杆被较高的杆遮挡。给出杆子的数量n，从左能看到的杆子数量L，从右能看到的杆子数量R，求杆子有多少种排列方式 考虑高度1~n的柱子，把高度1的插入2~i的某个排列中转移f[i][j][k]=f[i-1][j-1][k]+f[i-