[코테 5문제 챌린지]day 6

1. 표 병합
   https://school.programmers.co.kr/learn/courses/30/lessons/150366

2. 파괴되지 않은 건물
   https://school.programmers.co.kr/learn/courses/30/lessons/92344
   누적합 활용

3. 양궁대회
   https://school.programmers.co.kr/learn/courses/30/lessons/92342
   백트래킹 어려운 편

4. Gaaaaaaaaaarden
   https://www.acmicpc.net/problem/18809