8. 26

• I talked my mom about my lack of fundamental knowledge on mathematics. However, after some consideration, I became doubtful in practice. I sometimes should make the difference between necessity and sense of inferiority. This has been not only an impetus to plunge into a brand new area, but also nothing ending up to the lack of steadiness, which I need the most now. I should concentrate more on CS and take the minimum core part of mathematics. Knowledges on linear algebra would be. Integer programming and optimization would be left behind. So are some statistical concepts. I've taken a course on algebra and that would be a starting point. Taking multivariable calculus course on MIT courseware would be next. What is important now is taking steps, rather than jumping around and messing up. Being impatient is my best enemy.
• number theory에 관한 몇 문제들.. 정수론은 기본적인 몇 개념들만 이해하고 있으면 될 것 같다. 나머지는 문제를 풀면서 그때그때..^^; 에라토스테네스의 체를 이용해서 약수의 개수를 구하는 최적화 방법이 기억해야 할 부분.. 10^7까지 1초면 구해진다니 놀라운 DP의 세계여..
• hackerrank에서 DP문제를 풀고있는데 쉽지 않다. 쉬운듯하면서 새로운 문제들.. 오늘은 뒤에서부터 거꾸로 DP를 계산하는 신박한 방법을 배움