C#!
using System; using System.Collections.Generic; using System.Linq; using System.Text.RegularExpressions; namespace Rextester { public class Program { public static void Main(string[] args) { List<int[][]> testCases = new List<int[][]> { new int[][]{new int[]{9, 4}, new int[]{1,2,6,7}}, new int[][]{new int[]{1, 2}, new int[]{10,3,6,6}}, new int[][]{new int[]{20, 5}, new int[]{1,6,10,4}}, new int[][]{new int[]{0, 13}, new int[]{4,6,3,7}}, new int[][]{new int[]{0, 53}, new int[]{4,6,3,7}}, new int[][]{new int[]{12, 12}, new int[]{4,6,3,7}}, }; foreach (var testCase in testCases) { var solution = Balance(testCase); Console.Write("Input = [" + testCase[0][0] + ", " + testCase[0][1] + "], [" + string.Join(", ", testCase[1]) + "] Solution = "); if (solution is string) Console.WriteLine(solution); else { var s = solution as (List<int> lWeights, List<int> rWeights)?; Console.WriteLine("[" + string.Join(", ", s.Value.lWeights) + "], [" + string.Join(", ", s.Value.rWeights) + "]"); } } } public static object Balance(int[][] scaleArr) { int left = scaleArr[0][0]; int right = scaleArr[0][1]; int[] weights = scaleArr[1]; var solution = BalanceRec(left, right, weights); if (solution != null) { solution.Value.lWeights.Reverse(); solution.Value.rWeights.Reverse(); return solution; } else { return "not possible"; } } private static (List<int> lWeights, List<int> rWeights)? BalanceRec(int left, int right, int[] weights) { if (left == right) return ( new List<int>(), new List<int>() ); if (weights.Length == 0) return null; var solutions = new (List<int> lWeights, List<int> rWeights)?[weights.Length]; for (int i = 0; i < weights.Length; i++) { if (left < right) { solutions[i] = BalanceRec(left + weights[i], right, weights.Where((source, index) => index != i).ToArray()); if (solutions[i] == null) continue; solutions[i].Value.lWeights.Add(weights[i]); } else { solutions[i] = BalanceRec(left, right + weights[i], weights.Where((source, index) => index != i).ToArray()); if (solutions[i] == null) continue; solutions[i].Value.rWeights.Add(weights[i]); } } return solutions.Where(x => x != null).OrderBy(x => x.Value.lWeights.Count + x.Value.rWeights.Count).FirstOrDefault(); } } }
Try it: [repl.it/repls/MajesticBadDifference]
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C#!
Try it: [repl.it/repls/MajesticBadDifference]