698. Partition to K Equal Sum Subsets

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Given an integer array nums and an integer k, return true if it is possible to divide this array into k non-empty subsets whose sums are all equal. Example 1: Input: nums = [4,3,2,3,5,2,1], k = 4 Output: true Explanation: It is possible to divide it into 4 subsets (5), (1, 4), (2,3), (2,3) with equal sums. Example 2: Input: nums = [1,2,3,4], k = 3 Output: false Constraints: - 1 <= k <= n

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