摘要：Description: There is a positive integer X, X's reversion count is Y. For example, X=123, Y=321; X=1234, Y=4321. Z=(X-Y)/9, Judge if Z is made up of o 阅读全文

摘要：Description: The elderly aunts always like to look for bargains and preferential merchandise. Now there is a shop carrying out group purchase promotio 阅读全文