Mid-Term Exam

March 16, 2018

At many colleges and universities, Spring Break is approaching soon, and that means mid-term exams are also imminent. Here are two questions suitable for a mid-term exam for not-too-advanced students:

First: You are given two strings, say “aet6ukm” and “123678”; neither is necessarily sorted. You are to find the first character in the first string that also appears in the second string, and return the index of the character in the second string. For the two strings above, the character “6” appears in the first string and also in the second string, at index position 3 (counting from zero), so your program should return 3.

Second: You are given a list of recipes, where each recipe is a list with a name in the first position of the list and a list of ingredients in the remaining positions of the list; for instance, (“Pasta” “Spaghetti” “Tomato sauce” “Basil”) is a simple recipe for pasta. Your program should return a list of all ingredients that are used in more than one recipe, with a list of recipe names attached to each ingredient.

Your task is to answer the two mid-term exam questions given above. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.


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