Package g1501_1600.s1572_matrix_diagonal_sum

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    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 mat1 = 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:

    • n == mat.length == mat[i].length

    • 1 <= n <= 100

    • 1 <= mat[i][j] <= 100

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final Integer diagonalSum(Array<IntArray> mat)

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait