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Module DEMO-32-109DEMO-C-32

Main Diagonal Sum

DEMO-C-32 • Programming in C

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Problem Statement

Write a program to calculate the sum of the main diagonal elements (where row index equals column index) of a square matrix.

Constraints

1 <= N, M <= 10. Integers within standard range.

Input Format

Input: Dimensions N M followed by the matrix elements.

Output Format

Output: The formatted result as specified.

Sample Testcases

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Sample #1
Public sample
Input
4 4
41 48 1 10
47 5 34 32
19 11 38 -1
15 17 46 4
Output
88
Explanation
Main diagonal sum = 88.
Sample #2
Public sample
Input
5 5
33 12 41 22 19
7 48 12 1 50
30 -10 16 0 14
28 49 18 4 25
-1 -2 41 44 7
Output
108
Explanation
Main diagonal sum = 108.
Sample #3
Public sample
Input
4 4
46 9 28 6
-10 13 44 16
45 38 20 42
16 50 4 -9
Output
70
Explanation
Main diagonal sum = 70.
Sample #4
Public sample
Input
2 2
-10 48
23 4
Output
-6
Explanation
Main diagonal sum = -6.

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