Скачать или смотреть How to Sum Elements of a 2D Vector into a 1D Vector in C++

Discover how to effectively sum the elements of a two-dimensional vector and store the results in a one-dimensional vector using C++.
---
This video is based on the question https://stackoverflow.com/q/74402231/ asked by the user 'Prostoy_paren' ( https://stackoverflow.com/u/20477416/ ) and on the answer https://stackoverflow.com/a/74402348/ provided by the user 'wohlstad' ( https://stackoverflow.com/u/18519921/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: summation of elements of a 2D vector into a 1D vector. C++

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Summing Elements of a 2D Vector into a 1D Vector in C++

Working with vectors in C++ can sometimes present challenges, especially when it comes to managing multidimensional collections. One common task is to sum up the elements of a two-dimensional vector (2D vector) and store these summed results in a one-dimensional vector (1D vector). If you've ever encountered this problem and felt stuck, you’re not alone!

In this post, we will break down the steps needed to achieve this task effectively. Let’s explore how to sum each vector within a 2D vector in C++ and write the results into a 1D vector.

Understanding the Problem

The requirement is to take a given 2D vector, which consists of several vectors (or rows), and to sum the corresponding elements from each of these vectors into a separate vector.

Example Input

Let’s consider the following 2D vector:

[[See Video to Reveal this Text or Code Snippet]]

Desired Output

The aim is to create a 1D vector containing the sum of the elements from each column of the 2D vector:

[[See Video to Reveal this Text or Code Snippet]]

Here, 9 is the sum of the first column (1 + 3 + 5), and 12 is the sum of the second column (2 + 4 + 6).

Solution Steps

To achieve our goal, we can follow these steps:

1. Declare Variables

We need a 2D vector to hold our input data, and a 1D vector to store the results after summation.

2. Traverse Each Element

Loop through each vector (row) within the 2D vector. For each sub-vector, sum the corresponding elements into the appropriate index of the 1D vector.

3. Handle Compatibility

Ensure that all vectors within the 2D vector are of the same size.

4. Output the Result

Finally, output the results.

Sample Code

Here is a complete C++ program showing how to implement this logic:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Initialization: The sums vector is initialized with the size equal to the number of elements in each row of the 2D vector and filled with zeros.

Assertion: We assert that all sub-vectors have the same size to avoid any index-out-of-bounds errors.

Looping through Vectors: We use a range-for loop to iterate through each vector in a, and a simple for loop to sum up the corresponding elements into the sums vector.

Outputting the Result: Finally, we output the elements of the sums vector.

Conclusion

Using this method allows you to efficiently and effectively sum up elements in a 2D vector and store the results in a 1D vector in C++. By keeping our code organized and thoroughly checking for size compatibility, we can ensure smooth execution without errors.

Now you're equipped with the knowledge to tackle summations in multi-dimensional data structures! Happy coding!