Problem Statement
Determine if subset sums to target.
Approach
Recursively include/exclude elements. Check if sum reached.
Time & Space Complexity
Time O(2^n), optimized O(n×sum).

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Check if subset with given sum exists.
Determine if subset sums to target.
Recursively include/exclude elements. Check if sum reached.
Time O(2^n), optimized O(n×sum).
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