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For an array in Java, we can get the length of the array with array_name.length. Similarly, how would one get the number of rows and columns of a 2D array?
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We use arrayname. length to determine the number of rows in a 2D array because the length of a 2D array is equal to the number of rows it has. The number of columns may vary row to row, which is why the number of rows is used as the length of the 2D array.
Turn the 2d array into a 1d array ( List<Integer> ), then loop through the 1d array counting the duplicates as you find them and removing them so you don't count them more than once.
An efficient approach is to iterate for all the elements in the ith row of the matrix. Mark all elements using a hash table. Iterate in the array of numbers in the Z array, check if the number is present in the hash-table. Increase the count for every element present.
To get the length of a 2D Array in Python: Pass the entire array to the len() function to get the number of rows. Pass the first array element to the len() function to get the number of columns. Multiply the number of rows by the number of columns to get the total.
Well you probably want array_name.length for getting the count of the rows and array_name[0].length for the columns. That is, if you defined your array like so:
T[][] array_name = new T[row][col];
array_name.length // row
array_name[0].length // col
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