Updated README.md

Author: BrandonTang89

README.md

@@ -1245,3 +1245,6 @@ Python code usually requires Python 3.8 to work.
 | 63 | [CF2004_D_Colored_Portals](https://codeforces.com/contest/2004/problem/D) | [Python](https://github.com/BrandonTang89/Competitive_Programming_4_Solutions/blob/main/Other_Tasks/CF2004_D_Colored_Portals.py) |
 | 64 | [CF2004_E_Not_a_Nim_Problem](https://codeforces.com/contest/2004/problem/E) | [C++](https://github.com/BrandonTang89/Competitive_Programming_4_Solutions/blob/main/Other_Tasks/CF2004_E_Not_a_Nim_Problem.cpp) |
 | 65 | [CF2007_C_Dora_and_C](https://codeforces.com/contest/2007/problem/C) | [C++](https://github.com/BrandonTang89/Competitive_Programming_4_Solutions/blob/main/Other_Tasks/CF2007_C_Dora_and_C.cpp) |
+| 66 | [CF2023_A_Concatenation_of_Arrays](https://codeforces.com/contest/2023/problem/A) | [C++](https://github.com/BrandonTang89/Competitive_Programming_4_Solutions/blob/main/Other_Tasks/CF2023_A_Concatenation_of_Arrays.cpp) |
+| 67 | [CF2023_B_Skipping](https://codeforces.com/contest/2023/problem/B) | [C++](https://github.com/BrandonTang89/Competitive_Programming_4_Solutions/blob/main/Other_Tasks/CF2023_B_Skipping.cpp) |
+| 68 | [CF2023_C_C_K_S](https://codeforces.com/contest/2023/problem/C) | [C++](https://github.com/BrandonTang89/Competitive_Programming_4_Solutions/blob/main/Other_Tasks/CF2023_C_C_K_S.cpp) |