I am used to watching youtube videos while having lunch on weekdays, but today something was wrong with the vpn and I cannot open youtube. This made me really depressed.

Every time when the vpn doesn't work or restricts the internet speed I would feel terrible. I remember last time when I was home, found that I cannot use google because of the lagging of my vpn server, I was so frustrated. On that exact moment I had a intense feeling that I must leave this country someday.

Today this feeling comes again. I can't leave youtube, google, facebook, instagram.. and other things which have gradually embedded in my life. I feel lost, cut off from the outside world when I cannot touch the Internet outside of this country.

Anyway, it really makes me feel bad. Things must change. Please, please remember it and make changes.

1.01^365 = 37.8

Watched 覃超's live on douyutv. Here are some notes I took when watching.

1. 做题的4个步骤：

clarification:边界条件，极端情况问清
possible solutions: 想明白，比较各种解法，想出最优的；菜b和牛b的区别
coding
test cases

2. 递归不要想很多层，会把自己绕晕；只要想一层，要知道后面的事它会做好

3. 问考官会不会null，会不会太长；开始coding永远检查是否是合法的

4. 写，多写

5. prefer递归，递归提现思维，而且效率不低

6. 1.01^365次方是37.8，没有神。不停地做，不停地做，坚持

7. 递归里很多if判断可能是不需要的

8. 时间复杂度，空间复杂度非常非常重要