URGENTLY NEEDED C++ explain with steps and write working code

Find individual sum of each row of the 2D array (take values from user )and store corresponding result in 1D array (dynamically allocated, and delete it at the end of this task) i.e. sum of all the elements of row 0 should be stored in 1st element of 1D array, similarly sum of all elements of the second row of 2D array should be stored at the second index of 1D array. Display the final sum array (i.e. 1D array). Think about the size of 1D array yourself