LeetCode – Combinations (Java)

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], ] Java Solution public ArrayList<ArrayList<Integer>> combine(int n, int k) { ArrayList<ArrayList<Integer>> result = new ArrayList<ArrayList<Integer>>();   if … Read more