More Problems

• Check if a given matrix is a unit matrix (all diagonal elements are 1 and all off-diagonal elements are 0).
• Find the sum of each row in a 2D array.
• Find the product of the diagonal elements of a 2D matrix.
• Find the sum of elements in the first column of a 2D matrix.
• Find the largest element in the first row of a 2D matrix.
• Count how many elements in an array are prime numbers.
• Replace all negative elements in an array with their absolute value.
• Check if an array contains both positive and negative numbers.