Update README.md

1821-Study · Jul 8, 2022 · db183b7 · db183b7
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 | [팰린드롬수](https://www.acmicpc.net/problem/1259)        |    ✅     |       ✅    |           |          |    ✅   |
 | [영화감독 숌](https://www.acmicpc.net/problem/1436)       |    ✅     |            |           |          |    ✅   |
 | [랜선 자르기](https://www.acmicpc.net/problem/1654)       |    ✅      |            |           |          |       |
-| [스택 수열](https://www.acmicpc.net/problem/1874)        |          |            |           |          |       |
+| [스택 수열](https://www.acmicpc.net/problem/1874)        |     ✅     |            |           |          |       |
 | [수 찾기](https://www.acmicpc.net/problem/1920)         |          |            |           |          |       |
 | [소수 구하기](https://www.acmicpc.net/problem/1929)       |          |            |           |          |       |
 | [프린터 큐](https://www.acmicpc.net/problem/1966)        |          |            |           |          |       |