Enter several integers, ending with 0. Count the number of occurrences of each different integer, and output different integers and the number of occurrences from high to low. Input sample: 3 5 3 7 6 3 5 7 2 0 Output sample: 3:3 5:2 7:2 6:1 2:1

Requirements: 1. Use a single linked list (0 points if you use an array) 2, The linked list space must be deleted before the end of the program, do not cause memory leak (10 points) 3. Output from high to low according to the occurrence frequency of integer (25 points) 4. Can correctly count the number of different integers and their occurrence (35 points) 5. Ability to output linked list content (15 points)