1572 Matrix Diagonal Sum | Zero to FAANG Kunal | Assignment Solution | Leetcode

1773 Count Items Matching a Rule | Zero to FAANG Kunal | Assignment Solution | Leetcode

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1572. Matrix Diagonal Sum

Easy

Given a square matrix mat, return the sum of the matrix diagonals.

Only include the sum of all the elements on the primary diagonal and all the elements on the secondary diagonal that are not part of the primary diagonal.



Example 1:

Input: mat = [[1,2,3],
[4,5,6],
[7,8,9]]
Output: 25
Explanation: Diagonals sum: 1 + 5 + 9 + 3 + 7 = 25
Notice that element mat[1][1] = 5 is counted only once.
Example 2:

Input: mat = [[1,1,1,1],
[1,1,1,1],
[1,1,1,1],
[1,1,1,1]]
Output: 8
Example 3:

Input: mat = [[5]]
Output: 5


Constraints:

1 = n = 100
1 = mat[i][j] = 100
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[vedantoza]

Huge respect sir your explanation for the solution is just awesome and also a huge thank you for showing the C++ Code too huge respect sir 👏 will surely recommend your channel if anyone of my friend using C++ faces any difficulty in solving any leetcode problem

Thank you sir

[dynamokumar]

Very easy bro
i make very different way to solve but every time got new errors when matrix increase their length
-my code not inhanced for increasing length of elements thanks got new lesson.

[someone-qmju]

Great explanation🤩. Thank you so much.

[sabujdeeptudu]

Thank you so much bro, can you tell me how to think the approach of the problem. The way you taught really helped me.

[abhishekkr]

Good explanation bro bs ye mat[n-1-i] wla logic nhi samajh aaya ? Bata do koi agar janta hai toh

[soulcalculas]

Secondary diagonal ka logic nahi samjh aa raha hai [n-i-1] and what is n here... And please explain use of mat.length

[bandaruneeraj]

if you try to explain in english it will better to us

[ashugupta]

bhai mere ghar se pen paper le ja par writing improve kar kuch nahi saf dekh ta

[charviverma]

bhai english bolna seekhle nhi toh hindi toh dhang se bol liya kar