Write a program for building histograms.in C++

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Write a program for building histograms. Input data format: the number of statistical measurements, then the results themselves. Output data format: interval, number of results per interval. The data is output in the order of the first occurrence of the measurement result.. 
Input stream

8
 7 5 7 4 1 5 6 1

Output stream
7 2
5 2
4 1
1 2
6 1

What I have tried:

I tried to do this question without loops but doesn't work.

Posted 20-Sep-22 6:06am

Ishaan Tech

Updated 20-Sep-22 9:59am

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Richard MacCutchan 20-Sep-22 12:15pm

You need to show your code and explain which part does not work. We cannot help you without full details of your problem.

Dave Kreskowiak 20-Sep-22 13:35pm

Why would you do this without loops? It's not part of the problem description.

Rick York 20-Sep-22 21:17pm

The only reason I can think of is that doing it without loops would force them to use STL algorithms.

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OriginalGriff · Answer 1 · 2022-09-20T06:33:00

While we are more than willing to help those that are stuck, that doesn't mean that we are here to do it all for you! We can't do all the work, you are either getting paid for this, or it's part of your grades and it wouldn't be at all fair for us to do it all for you.

So we need you to do the work, and we will help you when you get stuck. That doesn't mean we will give you a step by step solution you can hand in!
Start by explaining where you are at the moment, and what the next step in the process is. Then tell us what you have tried to get that next step working, and what happened when you did.

If you are having problems getting started at all, then this may help: How to Write Code to Solve a Problem, A Beginner's Guide[^]

merano99 · Answer 2 · 2022-09-20T09:59:00

Solution 2

One possibility would be to write the input data into a vector

C++

vector <int> mdat = { 7, 5, 7, 4, 1, 5, 6, 1 };

And manage the histogram as a result in a pair:

C++

vector <pair<int, int>> hist;

Then it is possible to loop through the vector mdat and use it with
a find_if() query to check if the current value is already contained.
If it is not contained you can append the value as a new pair:

C++

hist.push_back(make_pair(val, 1));

If it is already included, you can simply increment the second value.

Posted 20-Sep-22 9:59am

merano99

Comments

CPallini 21-Sep-22 3:08am

5.Note you can satisfy the requirements in four lines of code, using a set and a multiset.

merano99 21-Sep-22 3:41am

Thanks!

merano99 21-Sep-22 3:44am

Wouldn't a std::set sort what was explicitly not wanted here?

CPallini 21-Sep-22 3:52am

Why?

merano99 21-Sep-22 4:51am

The requirement states: "The data is output in the order of the first occurrence of the measurement result.. ". Additional effort in data management and output would probably be necessary for a set.

CPallini 21-Sep-22 5:14am

OOOPS, you are right, I stand corrected.