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Count all subsequences having product less than K
Given a non negative array, find the number of subsequences having product smaller than K.
k<10^2 arr.size<10^3
Examples:
Input : [1, 2, 3, 4]
k = 10
Output :11
The subsequences are {1}, {2}, {3}, {4}, {1, 2}, {1, 3}, {1, 4}, {2, 3}, {2, 4}, {1, 2, 3}, {1, 2, 4}
Input : [4, 8, 7, 2]
k = 50
Output : 9
