Understand what the interviewer is asking for by using test cases and questions about the problem.

• Q
  • What is the desired outcome?
    • To determine if the counts of each souvenir type are unique.
  • What input is provided?
    • An array of strings souvenirs.

Plan the solution with appropriate visualizations and pseudocode.

General Idea: Count the occurrences of each souvenir, then check if these counts are unique.

1) Count the occurrences of each souvenir in `souvenirs` using a dictionary. 2) Track the counts in a set to check for uniqueness. 3) If all counts are unique, return `True`; otherwise, return `False`.

⚠️ Common Mistakes

• Not properly checking for duplicate counts.

def unique_souvenir_counts(souvenirs): # Create a dictionary to count the number of each souvenir count_dict = {} for souvenir in souvenirs: if souvenir in count_dict: count_dict[souvenir] += 1 else: count_dict[souvenir] = 1 # Create a set to track the counts we've seen seen_counts = set() # Check if all counts are unique for count in count_dict.values(): if count in seen_counts: return False seen_counts.add(count) return True