📝docs: 주간 일정 수정

README.md

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 | 주차 | 날짜 | 문제 유형 | 문제 | 난이도 | 비고 |
 |:---:|:---:|:---:|:---:|:---:|:---:|
-| week_17 | 06-12 ~ 06-18 | Backtracking | <p align=left> 1️⃣ [N과 M (1)](https://www.acmicpc.net/problem/15649) <br> 2️⃣ [N과 M (9)](https://www.acmicpc.net/problem/15663) <br> 3️⃣ [넴모넴모 (Easy)](https://www.acmicpc.net/problem/14712) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/8.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/9.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/11.svg"/> | <br><br> |
+| week_19 | 06-26 ~ 07-02 | Backtracking | <p align=left> 1️⃣ [N과 M (1)](https://www.acmicpc.net/problem/15649) <br> 2️⃣ [N과 M (9)](https://www.acmicpc.net/problem/15663) <br> 3️⃣ [넴모넴모 (Easy)](https://www.acmicpc.net/problem/14712) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/8.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/9.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/11.svg"/> | <br><br> |
 
 
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 | week_15 | 05-29 ~ 06-04 | Data Structre 1 | <p align=left> 1️⃣ [괄호](https://www.acmicpc.net/problem/9012) <br> 2️⃣ [후위 표기식2](https://www.acmicpc.net/problem/1935) <br> 3️⃣ [탑](https://www.acmicpc.net/problem/2493) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/7.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/8.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/11.svg"/> | <br><br> |
 | week_16 | 06-05 ~ 06-11 | Data Structre 2 | <p align=left> 1️⃣ [나는야 포켓몬 마스터 이다솜](https://www.acmicpc.net/problem/1620) <br> 2️⃣ [N번째 큰 수](https://www.acmicpc.net/problem/2075) <br> 3️⃣ [이중 우선순위 큐](https://www.acmicpc.net/problem/7662) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/7.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/8.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/12.svg"/> | <br><br> |
 | week_17 | 06-12 ~ 06-18 | 방학 | X | X | X |
-| week_18 | 06-19 ~ 06-25 | Backtracking | <p align=left> 1️⃣ [N과 M (1)](https://www.acmicpc.net/problem/15649) <br> 2️⃣ [N과 M (9)](https://www.acmicpc.net/problem/15663) <br> 3️⃣ [넴모넴모 (Easy)](https://www.acmicpc.net/problem/14712) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/8.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/9.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/11.svg"/> | <br><br> |
-| week_19 | 06-26 ~ 07-02 | Shortest Path | <p align=left> 1️⃣ [특정 거리의 도시 찾기](https://www.acmicpc.net/problem/18352) <br> 2️⃣ [경로 찾기](https://www.acmicpc.net/problem/11403) <br> 3️⃣ [숨바꼭질 3](https://www.acmicpc.net/problem/13549) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/9.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/10.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/11.svg"/> | <br><br> |
-| week_20 | 07-03 ~ 07-09 | Minimum Spanning Tree | <p align=left> 1️⃣ [최소 스패닝 트리](https://www.acmicpc.net/problem/1197) <br> 2️⃣ [네트워크 연결](https://www.acmicpc.net/problem/1922) <br> 3️⃣ [도시 건설](https://www.acmicpc.net/problem/21924) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/12.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/12.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/12.svg"/> | <br><br> |
-| week_21 | 07-10 ~ 07-16 | Simulation | <p align=left> 1️⃣ [지구 온난화](https://www.acmicpc.net/problem/5212) <br> 2️⃣ [후보 추천하기](https://www.acmicpc.net/problem/1713) <br> 3️⃣ [마법사 상어와 비바라기](https://www.acmicpc.net/problem/21610) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/9.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/10.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/11.svg"/> | <br><br> |
+| week_18 | 06-19 ~ 06-25 | 방학 | X | X | X |
+| week_19 | 06-26 ~ 07-02 | 방학 | X | X | X |
+| week_20 | 07-03 ~ 07-09 | Backtracking | <p align=left> 1️⃣ [N과 M (1)](https://www.acmicpc.net/problem/15649) <br> 2️⃣ [N과 M (9)](https://www.acmicpc.net/problem/15663) <br> 3️⃣ [넴모넴모 (Easy)](https://www.acmicpc.net/problem/14712) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/8.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/9.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/11.svg"/> | <br><br> |
+| week_21 | 07-10 ~ 07-16 | Shortest Path | <p align=left> 1️⃣ [특정 거리의 도시 찾기](https://www.acmicpc.net/problem/18352) <br> 2️⃣ [경로 찾기](https://www.acmicpc.net/problem/11403) <br> 3️⃣ [숨바꼭질 3](https://www.acmicpc.net/problem/13549) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/9.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/10.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/11.svg"/> | <br><br> |
+| week_22 | 07-17 ~ 07-23 | Minimum Spanning Tree | <p align=left> 1️⃣ [최소 스패닝 트리](https://www.acmicpc.net/problem/1197) <br> 2️⃣ [네트워크 연결](https://www.acmicpc.net/problem/1922) <br> 3️⃣ [도시 건설](https://www.acmicpc.net/problem/21924) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/12.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/12.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/12.svg"/> | <br><br> |
+| week_23 | 07-24 ~ 07-30 | Simulation | <p align=left> 1️⃣ [지구 온난화](https://www.acmicpc.net/problem/5212) <br> 2️⃣ [후보 추천하기](https://www.acmicpc.net/problem/1713) <br> 3️⃣ [마법사 상어와 비바라기](https://www.acmicpc.net/problem/21610) </p> | <img height="20px" width="25px" src="https://static.solved.ac/tier_small/9.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/10.svg"/> <br> <img height="20px" width="25px" src="https://static.solved.ac/tier_small/11.svg"/> | <br><br> |