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一、直接计算法排列组合问题中,若某些元素或某些位置有特殊要求,那么,一般先安排这些特殊元素或位置,然后再安排其它元素或位置,这种方法叫特殊元素(位置)分析法。1.元素分析法先安排有约束条件的元素,元素找位置。例1:某天的课表要排入语文、数学、英语、物理、化学、体育六门课,如果第一节不排体育,最后一节不排数学,一共有
First, in the direct-computation-algorithm-combination problem, if there are special requirements for certain elements or positions, then generally these special elements or positions are arranged first, and then other elements or positions are arranged. This method is called special element (position) Analysis. 1. The elemental analysis method first arranges the elements with constraints, and the element finds the position. Example 1: One day’s timetables will be discharged into six classes: Chinese, Mathematics, English, Physics, Chemistry, and Physical Education. If the first section is not ranked in sports, the last section will not be ranked in mathematics.