Find the Sum of the Power of All Subsequences at DE Shaw

Problem Description

You are given an integer array `nums` of length `n` and a **positive** integer `k`. The **power** of an array of integers is defined as the number of subsequences with their sum **equal** to `k`. Return _the**sum** of **power** of all subsequences of_ `nums` _._ Since the answer may be very large...

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