论文部分内容阅读
折下一枝桧树叶串,你会看到柄尖有一个叶片,其余的叶片都互生在柄上,其数多少不等。(图1)如果从某个叶片开始,循一定方向(逆时针的或顺时针的)每隔一个叶片摘去一个叶片,周而复始地一直摘下去,最后一定只剩下一个叶片。现在要求确定从哪个叶片开始能使最后所剩的叶片正好是柄尖那一片。如果叶柄上的叶数不多,使用“试摘法”是有效的:从柄尖的叶片开始先循顺(逆)时针方向,每隔一个叶片把一个叶片掐去一小块,这种掐过的叶片在以后被轮到时就不再当作一个叶片计算,这样做到最后,叶柄上只剩下一个叶片没被掐过,它到柄尖那个
Break a cypress leaf string, you will see the handle tip has a blade, the remaining leaves are born in the handle, the number of how many. (Figure 1) If you pick a blade every other blade in a certain direction (counterclockwise or clockwise) from the beginning of a blade, continue to pick it up and down, leaving only one blade in the end. It is now required to determine from which blade the last remaining blade will be exactly the one to be pointed. If the number of leaves on the petiole is small, the use of the “test method” is effective: from the tip of the handle leaf along the first (reverse) clockwise direction, every other leaf pinch a small piece of this pinch After the leaves have been round when it is no longer as a blade calculation, so in the end, the petiole only one blade has not been pinched, it to the handle that