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[Coding Challenge] Special Elements in Matrix

Aniruddha Chaudhari/27888/5
Code

This coding challenge was asked in Goldman Sachs coderpad coding interview round and also in the Syntel hackathon interview.

Problem Statement: Special Elements in Matrix

Given a matrix of size m*n, m denotes the row starting with index 0 and n denotes the column starting with index 0.

The matrix will hold distinct integers as elements.

We need to find a distinct number of positional elements which are either the minimum or maximum in their corresponding row or column.

Please return -1 if any row or any column has multiple minimum or maximum elements.

For example, given a matrix of size 3*3, the elements are stored as follows.

1  3  4
5  2  9
8  7  6

The expected output is 7.

In the above example, we identified the output as 7 based on below.

1 - minimum in row and column
4 - Maximum in row
2 - Minimum in column and row
9 - Maximum in row and column
8 - Maximum in row and column
7 - Maximum in column
6 - Minimum in row

Input:

m - integer - number of rows
n - integer - number of columns
m * n matrix

Output:

r - integer - result

Constraints:

0<m,n<100
Elements in the matrix are positive integers.

Programming Solution in Python:

Here is the code for special elements in matrix solved in Python.

# Complete the countSpecialElements function below.
  
def countSpecialElements(matrix):
  nRows= len(matrix)
  nCount=0
  
  for row in matrix:
    for indexCol, element in enumerate(row):
  
      if element==min(row) or element==max(row):
        if row.count(element)>1:
          return -1
        nCount=nCount+1
  
      else:
        listColumn=[]
  
        for indexRow in range(0, nRows):
          listColumn.append(matrix[indexRow][indexCol])
  
        if element==min(listColumn) or element==max(listColumn):
          if listColumn.count(element)>1:
            return -1
          nCount=nCount+1

  return nCount
  
if __name__ == '__main__':
  nCount = countSpecialElements([[1, 3, 4],[5, 2, 9],[8, 7, 6]])
  print(nCount)

Output:

7

In Python, matrix elements are stored as a nested list. To solve this kind of problem, you should have a good understanding of the list and its methods.

If you are solving this coding question in a competitive test round, consider all boundary cases.

There was one more question was asked in the Goldman Sachs coding round- Secure My Conversation.

Python Interview Questions eBook

coding challengePython
Aniruddha Chaudhari
I am complete Python Nut, love Linux and vim as an editor. I hold a Master of Computer Science from NIT Trichy. I dabble in C/C++, Java too. I keep sharing my coding knowledge and my own experience on CSEstack.org portal.

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Comments

  • Reply
    Ravi
    March 2, 2020 at 12:15 am

    The output of your code is 10, not 9.

    • Reply
      Aniruddha Chaudhari
      March 2, 2020 at 6:52 pm

      Edited. Thanks for the correction, Ravi!

  • Reply
    Moksha Jain
    May 9, 2020 at 1:58 pm

    Sir, there is a mistake in code…of indentation inside else block…

                    for indexRow in range(0, nRows):
                        listColumn.append(matrix[indexRow][indexCol])
    
                    if element == min(listColumn) or element == max(listColumn):
                            if listColumn.count(element) &gt; 1:
                                return -1
                            nCount = nCount + 1
    

    the correct output is 7.
    Thanks

    • Reply
      Aniruddha Chaudhari
      May 9, 2020 at 5:28 pm

      Thanks for the correction, Moksha! Indentation is fixed.

  • Reply
    Gordon
    March 21, 2022 at 7:40 pm

    Is there a more efficient way to solve this problem? Because at worst this code is using a triple nested for loop.

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Why?

Why Competitive Programming Important?

Coding Challenges for Practice

  1. Count Common Factor
  2. Does it Divide
  3. Sum of Sub Arrays
  4. Pair of Desired Sum
  5. Remove Duplicate Char from String
  6. Sort String by Char Freq (Python)
  7. Sort String by Char Freq (Java)
  8. Split Array into Equal Sum Subarray
  9. Validate IP Address
  10. Validate PAN Card Number
  11. Validate Sudoku
  12. Sort Circular Rotated Array
  13. Min Arrow to Burst Bubbles
  14. Min Cost to Paint All Houses [Amazon]
  15. HourGlass with Largest Sum
  16. Max Profit by Buying/Selling Stocks
  17. Hailstone Sequence
  18. Reverse String without affecting Special Characters
  19. Secure Conversation by Encry/Decry
  20. Special Elements in Matrix
  21. Next Greater No with Same set of Digits
  22. Smallest Subarray with Sum Greater than Given Number
  23. Group Anagrams
  24. Find Duplicates in Array in O(n)
  25. Find Two Unique Numbers from Array in O(n)
  26. Number Patterns & Finding Smallest Number
  27. First Unique Element in a Stream
  28. Flip Equivalent Binary Trees [TeachMint]
  29. Minimum Cost of Merging Files [Amazon]
  30. Minimum Distance for Truck to Deliver Order [Amazon]
  31. Order Task for Given Dependencies
  32. Design Music Player
  33. Multilevel Parking System Design
  34. Minimum Coins Required
  35. Max Sum Subarray
  36. Max Avg Sum of Two Subsequences
  37. Merge Overlapping Intervals
  38. Longest Balanced Subarray
  39. Longest Path in a Weighted Tree
  40. Generate Balanced Parentheses
  41. PostOrder Traversal Without Recursion

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