using System; namespace ProjectEuler_18 { internal class Program { private static int[][] GetGreatestPathSum(int[][] triangle, int index) { if (index < triangle.Length - 1) { triangle = GetGreatestPathSum(triangle, index + 1); } if (index - 1 < 0) { return triangle; } int[] top = triangle[index - 1]; int[] bottom = triangle[index]; int[] result = new int[top.Length]; for (int i = 0; i < top.Length; i++) { result[i] = Math.Max(top[i] + bottom[i], top[i] + bottom[i + 1]); } triangle[index - 1] = result; return triangle; } private static void Main(string[] args) { string triangle = @"75 95 64 17 47 82 18 35 87 10 20 04 82 47 65 19 01 23 75 03 34 88 02 77 73 07 63 67 99 65 04 28 06 16 70 92 41 41 26 56 83 40 80 70 33 41 48 72 33 47 32 37 16 94 29 53 71 44 65 25 43 91 52 97 51 14 70 11 33 28 77 73 17 78 39 68 17 57 91 71 52 38 17 14 91 43 58 50 27 29 48 63 66 04 68 89 53 67 30 73 16 69 87 40 31 04 62 98 27 23 09 70 98 73 93 38 53 60 04 23"; string[] triangleLines = triangle.Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries); int[][] intTriangle = new int[triangleLines.Length][]; for (int i = 0; i < triangleLines.Length; i++) { string[] numberStrings = triangleLines[i].Split(' '); int[] numbers = new int[numberStrings.Length]; for (int x = 0; x < numberStrings.Length; x++) { numbers[x] = int.Parse(numberStrings[x]); } intTriangle[i] = numbers; } int sum = GetGreatestPathSum(intTriangle, 0)[0][0]; Console.WriteLine("Greatest path sum: {0}", sum); } } }
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