Time is divided into four categories:
[Investment - time with practical help] such as memorizing words, doing homework
1. Take a class
2. Do homework
3. Algorithms and data structure learning (c/c++)
4. JAVA learning
5. English
6. Self-study others
7. Exercise
[Fixed - unhelpful but must-spend time] such as eating, walking to class, going to the toilet
1. to walk
2. Personal hygiene
3. Emergencies
4. Other
[Sleep-Sleep time every day] The goal is to sleep 6 hours a day, and the energy is still strong
【Waste - unhelpful and unnecessary time】Play games, have dinner, go shopping
1. Play games
2. Dinner, shopping