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</html><description>Problem Description Given an integer array nums, find all unique pairs of indices i and j such that nums[i] + nums[j] == target. Each number can be used only once, and index pairs (i, j) and (j, i) are considered the same combination, so they should not be counted multiple times. For example, if the &hellip; &#xB354; &#xBCF4;&#xAE30; ""</description></oembed>
