Preceding number list

Write a function @pre_number_list(n, f)@ that given an integer $n$ and a list of integers $f$ , returns the list formed by the numbers in $f$ that appear just before each ocurrence of $n$ in $f$ . The order of appearance of the numbers in the resulting list must preserve the original order.

Sample session

Problem information

Author: ProAl

Generation: 2026-01-25T17:47:06.999Z