java based

1. String(문자열)

2. Array(1, 2차원 배열)

3. Two pointers, Sliding window[효율성 : O(n^2)-->O(n)]

4. HashMap, TreeSet (해쉬, 정렬지원 Set)

5. Stack, Queue(자료구조)

6. Sorting and Searching(정렬, 이분검색과 결정알고리즘)

7. Recursive, Tree, Graph(DFS, BFS 기초)

8. DFS, BFS 활용

9. Greedy Algorithm

10. dynamic programming(동적계획법)