Solved

Finding maximum sum of contigious elements.

Posted on 2015-01-03
2
117 Views
Last Modified: 2015-01-14
Could you confirm that linear algorithm is not so wide solution like O(n log n) - divide and conquer ?
Because I have noticed that ,when all negative, it does not work.
But, in John Bentley "Programming Pearls" book there is not mention about working correctly only with positive.

    int maxsofar = 0;
    int maxhere = 0;
    for (int j = 0; j < n; j++)
    {
        maxhere = mymax(maxhere + a[j], 0);
        maxsofar = mymax(maxsofar, maxhere);
    }

Open in new window

0
Comment
Question by:Nusrat Nuriyev
2 Comments
 
LVL 69

Accepted Solution

by:
Qlemo earned 250 total points
ID: 40530125
No, it does not work for only negative numbers. The first check is max(-something, 0), and that will always return 0. All values are lower than 0.
To have that work, you need to provide a largely negative number like -maxint instead of 0 in the max function.
0
 
LVL 84

Assisted Solution

by:ozo
ozo earned 250 total points
ID: 40530458
When all negative, the maximum sum would contain 0 contigious elements, and the algorithm will correctly produce maxsofar=0
0

Featured Post

ScreenConnect 6.0 Free Trial

At ScreenConnect, partner feedback doesn't fall on deaf ears. We collected partner suggestions off of their virtual wish list and transformed them into one game-changing release: ScreenConnect 6.0. Explore all of the extras and enhancements for yourself!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction This article is a continuation of the C/C++ Visual Studio Express debugger series. Part 1 provided a quick start guide in using the debugger. Part 2 focused on additional topics in breakpoints. As your assignments become a little more …
Iteration: Iteration is repetition of a process. A student who goes to school repeats the process of going to school everyday until graduation. We go to grocery store at least once or twice a month to buy products. We repeat this process every mont…
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question