Question

In Python define a function remove_indices which is given a list of items and a list...

In Python

define a function remove_indices which is given a list of items and a list of indices to remove. Remove the given indices in place (no extra memory) in linear time

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Answer #1

Complete code in Python3:-

# This function removs Elements from 'Items' list
# At indices stored in 'Indices'.
def remove_indices(Items, Indices):
   # Marking those Items as 'None' which will be deleted.
   for i in Indices:
       Items[i] = None
   # Traversing Items list and removing 'None' Items
   i = 0
   while i < len(Items):
       if Items[i] is None:
           del Items[i]
       else:
           i += 1

# List of Items
Items = [1, 2, 3, 4, 5, 6, 7, 89, 78]
# Printing List of items before removal
print("List before removing : ", Items)
# List of Indices that will be removed form the List fo Items.
Indices = [4, 2, 5, 8]
# Removing Indices from list
remove_indices(Items, Indices)
# Printing List of Items after removal
print("List after removing : ", Items)

Screenshot of output:-

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