# Exam question for a beginner coder

Joe Pegler

Greenhorn

Posts: 16

posted 3 years ago

Mike is right, your algorithm for finding the largest number in an array is not quite right.

Here are some guidelines that will help you come up with a better approach:

1. You may only iterate through the entire array once.

2. You may only look at one array element at a time (your current algorithm looks at two elements on each iteration).

3. Besides the array and (possibly) a loop index, you may use only one other variable in your algorithm

Imagine solving this problem with real-world objects. The array is a row of boxes, each filled with an unknown random number of marbles. You are asked to find out what is the most number of marbles in any of the boxes. Basically the same rules apply: you may only count the marbles in one box at a time. When you're done with a box, you may never look at it again. You are not allowed to memorize or remember anything about a box or its contents after you are done looking at it. The only "memory device" you are allowed to use is a small notepad. You are given a pencil which has an eraser so you can erase your current note before jotting down a new note.

Given these rules, what is the most straightforward way you can think of to figure out the most number of marbles in any of the boxes.

Here are some guidelines that will help you come up with a better approach:

1. You may only iterate through the entire array once.

2. You may only look at one array element at a time (your current algorithm looks at two elements on each iteration).

3. Besides the array and (possibly) a loop index, you may use only one other variable in your algorithm

Imagine solving this problem with real-world objects. The array is a row of boxes, each filled with an unknown random number of marbles. You are asked to find out what is the most number of marbles in any of the boxes. Basically the same rules apply: you may only count the marbles in one box at a time. When you're done with a box, you may never look at it again. You are not allowed to memorize or remember anything about a box or its contents after you are done looking at it. The only "memory device" you are allowed to use is a small notepad. You are given a pencil which has an eraser so you can erase your current note before jotting down a new note.

Given these rules, what is the most straightforward way you can think of to figure out the most number of marbles in any of the boxes.

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Campbell Ritchie

Sheriff

Posts: 48910

58

Mike Simmons

Ranch Hand

Posts: 3076

13

posted 3 years ago

Then why are you asking if it's OK, if you haven't shown us the latest version? What you've shown does

Joe Pegler wrote:I didMike Simmons wrote: Not unless you've changed it since you posted it above

Then why are you asking if it's OK, if you haven't shown us the latest version? What you've shown does

*not*work, as you can easily verify with the test i described.

Consider Paul's rocket mass heater. |