8.7 Judge belongingness of sets when order is considered
Here below is a monthly sales ranking table for the first quarter:
Find out the month that contains the top 3 products by total sales in the first quarter (same ranking order is required):
A1: Convert the passed-in data to a two-dimensional table sequence.
A2: Calculate the top 3 products by total sales in the first quarter.
A3: When the pos@c() judges the belongingness of sets, the order of members should be the same.