BASE PROBLEM - [x] 1. [구간 합 구하기 4](https://www.acmicpc.net/problem/11659) - [x] 2. [집합](https://www.acmicpc.net/problem/11723) - [x] 3. [연결 요소의 개수](https://www.acmicpc.net/problem/11724) - [x] 4. [2xN 타일링](https://www.acmicpc.net/problem/11726) - [x] 5. [2xN 타일링2](https://www.acmicpc.net/problem/11727) - [x] 6. [테트로미노](https://www.acmicpc.net/problem/14500) - [x] 7. [아기 상어](https://www.acmicpc.net/problem/16236) - [x] 8. [뱀과 사다리 게임](https://www.acmicpc.net/problem/16928) - [x] 9. [비밀번호 찾기](https://www.acmicpc.net/problem/17219) - [x] 10. [Four Squares](https://www.acmicpc.net/problem/17626) - [x] 11. [좌표 압축](https://www.acmicpc.net/problem/18870)
