1. Array size
2、long long
3. Bit operation parentheses
4、1ll * int
5. Don't kick the power cord
6. If the code of the big cow is WA, there must be more than two bugs
7, stack
8. Do not calculate inside the for loop
9. pow accuracy sucks
10, 10 Special judgment
11. Consider bit operations
12. INF is too small
13. After reading the cla, submit the question
14. Don’t stagger the topics
15. Comments are deleted
16. Remember to read the list
17. Be sure to read the topic
18. Don’t use algorithms to set questions
20. Think about whether you can divide the answer for five minutes
21. Structure sorting must determine the determination of all elements
22. Come on