Whats the worst case time and space complexity of different algorithms to find combination i.e. nCr Which algorithm is the best known solution in terms of time/space complexity?
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O(n!)
is the time complexity to generate all combinations one by one.To find how many combinations are there, we can use this formula:
As @beaker mentioned, this count can be calculated in
O(1)
time (i.e., constant time).