<ul><li>Given an array of non-repeating numbers and a key, find all the unique combinations in that array where the sum of those combinations is equal to the key.</li><li>Example 1:</li><li>    Input: Array = [2,3,6,7], key = 7</li><li>    Output: [[7],[2,2,3]]</li><li>Example 2:</li><li>    Input: Array = [2,3,5], key = 8</li><li>    Output: [[2,2,2,2],[2,3,3],[3,5]]</li><li>Solution in C++ code provided.</li></ul>

Given an array of non repeating numbers and a key, find all the unique combinations in that array, where the sum of those combination is equal to the key.

Given an array of non repeating numbers and a key, find all the unique combinations in that array, where the sum of those combination is equal to the key.

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