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* flake8 --max-line-length=88
* fixup! Format Python code with psf/black push
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44 lines
1.4 KiB
Python
44 lines
1.4 KiB
Python
# Print all subset combinations of n element in given set of r element.
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def combination_util(arr, n, r, index, data, i):
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"""
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Current combination is ready to be printed, print it
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arr[] ---> Input Array
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data[] ---> Temporary array to store current combination
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start & end ---> Staring and Ending indexes in arr[]
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index ---> Current index in data[]
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r ---> Size of a combination to be printed
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"""
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if index == r:
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for j in range(r):
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print(data[j], end=" ")
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print(" ")
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return
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# When no more elements are there to put in data[]
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if i >= n:
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return
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# current is included, put next at next location
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data[index] = arr[i]
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combination_util(arr, n, r, index + 1, data, i + 1)
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# current is excluded, replace it with
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# next (Note that i+1 is passed, but
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# index is not changed)
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combination_util(arr, n, r, index, data, i + 1)
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# The main function that prints all combinations
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# of size r in arr[] of size n. This function
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# mainly uses combinationUtil()
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def print_combination(arr, n, r):
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# A temporary array to store all combination one by one
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data = [0] * r
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# Print all combination using temporary array 'data[]'
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combination_util(arr, n, r, 0, data, 0)
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# Driver function to check for above function
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arr = [10, 20, 30, 40, 50]
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print_combination(arr, len(arr), 3)
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# This code is contributed by Ambuj sahu
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