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491. Non-decreasing Subsequences Hardness: \(\color{orange}\textsf{Medium}\) Ralated Topics: Array、Hash Table、Backtracking、Bit Manipulation 一、題目 Given an integer array nums, return all the different possible non-decreasing subsequences of the given array with at least two elements. You may return the answer in any order. Example 1: Input: nums = [4,6,7,7] Output: [[4,6],[4,6,7],[4,6,7,7],[4,7],[4,7,7],[6,7],[6,7,7],[7,7]] Explanation: Example 2: Input: nums = [4,4,3,2,1] Output: [[4,4]] Constrai...