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To Everyone using nums[ i ] % 2 == 0 to check for even element. Use bitmask to determine even numbers which is fast computation wise.( nums[ i ] & 0x1 ) == 0 instead of nums[ i ] % 2 == 0

Example

We can convert integer to string and then get chars, but more effective way is to use / and % operators, here is an example more effective example

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iterative approach recursive approach

ALL SUBSETS IS NOT ALL SUBARRAYS !!! Lets say we have array with nums 5 1 6, what will be all combinations of these nums ? It’s a tree, so we can traverse it and get all combinations, where we … Continue reading →

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