每周更新：

下周要解决的问题：

  1. Watson asks Does Permutation Exist(https://www.codechef.com/problems/PERMEXIS)🟢
  2. Chef and digits of a number(https://www.codechef.com/problems/LONGSEQ)🟢
  3. Making a Meal(https://www.codechef.com/problems/CFMM)🟢
  4. Jumping in the hills(https://www.codechef.com/problems/HILLS)🟢
  5. New Piece(https://www.codechef.com/problems/NEWPIECE)🟢
  6. Version Control System(https://www.codechef.com/problems/VCS)🟢
  7. A Subtask Problem(https://www.codechef.com/problems/SUBTASK)🟢
  8. Odd Repeat(https://www.codechef.com/problems/REPEAT)🟢