combinations.js

/**
 * Source:  https://leetcode.com/problems/combinations/
 * Tags:    [Backtracking]
 * Level:   Medium
 * Title:   Combinations
 * Auther:  @imcoddy
 * Content: Given two integers n and k, return all possible combinations of k numbers out of 1 ... n.
 *
 *
 * For example,
 * If n = 4 and k = 2, a solution is:
 *
 *
 *
 * [
 *   [2,4],
 *   [3,4],
 *   [2,3],
 *   [1,2],
 *   [1,3],
 *   [1,4],
 * ]
 *
 *
 *
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 *                   Show Similar Problems
 *
 *
 *                      (M) Combination Sum
 *
 *                      (M) Permutations
 */

/**
 * @param {number} n
 * @param {number} k
 * @return {number[][]}
 */
var combine = function(n, k) {

};