摘要：Maxim always goes to the supermarket on Sundays. Today the supermarket has a special offer of discount systems. There are m types of discounts. We ass 阅读全文

摘要：A. Sum in the tree A. Sum in the tree Mitya has a rooted tree with nn vertices indexed from 11 to nn, where the root has index 11. Each vertex vv init 阅读全文