when we display outputs such as "Highest value at row x", should x be the index of that row, or the length value of the row?

For reference. Use the index to check the element of the array in the row and use an if statement to compare the two elements. You can use a variable set to 0 to compare the first element then assign the element to the variable if it is higher, and continue through the row in the same way. int high = 0; if (arr[i] > high) { high = arr[i];}