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| 1 | +using System.Numerics; |
| 2 | + |
| 3 | +public class Solution |
| 4 | +{ |
| 5 | + #region First Approach |
| 6 | + private static BigInteger _ConvertToNumber(int[] digits) |
| 7 | + { |
| 8 | + if (digits is null || digits.Length == 0) |
| 9 | + { |
| 10 | + return 0; |
| 11 | + } |
| 12 | + |
| 13 | + BigInteger result = 0; |
| 14 | + for (int i = 0; i < digits.Length; i++) |
| 15 | + { |
| 16 | + result = (result * 10) + digits[i]; |
| 17 | + } |
| 18 | + |
| 19 | + return result; |
| 20 | + } |
| 21 | + |
| 22 | + private static int[] _ConvertToArray(BigInteger number) |
| 23 | + { |
| 24 | + List<int> digits = new(); |
| 25 | + |
| 26 | + while (number > 0) |
| 27 | + { |
| 28 | + byte remainder = (byte)(number % 10); |
| 29 | + number /= 10; |
| 30 | + |
| 31 | + digits.Add(remainder); |
| 32 | + } |
| 33 | + |
| 34 | + digits.Reverse(); |
| 35 | + return digits.ToArray(); |
| 36 | + } |
| 37 | + |
| 38 | + public static int[] PlusOne(int[] digits) |
| 39 | + { |
| 40 | + if (digits is null || digits.Length == 0) |
| 41 | + { |
| 42 | + return []; |
| 43 | + } |
| 44 | + |
| 45 | + int[] result = []; |
| 46 | + |
| 47 | + BigInteger number = _ConvertToNumber(digits); |
| 48 | + number++; |
| 49 | + |
| 50 | + result = _ConvertToArray(number); |
| 51 | + |
| 52 | + return result; |
| 53 | + } |
| 54 | + #endregion |
| 55 | + |
| 56 | + #region Second Approach |
| 57 | + public static int[] PlusOne2(int[] digits) |
| 58 | + { |
| 59 | + if (digits is null || digits.Length == 0) |
| 60 | + { |
| 61 | + return []; |
| 62 | + } |
| 63 | + |
| 64 | + for (int i = digits.Length - 1; i >= 0; i--) |
| 65 | + { |
| 66 | + if (digits[i] < 9) |
| 67 | + { |
| 68 | + digits[i]++; |
| 69 | + |
| 70 | + return digits; |
| 71 | + } |
| 72 | + |
| 73 | + digits[i] = 0; |
| 74 | + } |
| 75 | + |
| 76 | + int[] result = new int[digits.Length + 1]; |
| 77 | + |
| 78 | + result[0] = 1; |
| 79 | + |
| 80 | + return result; |
| 81 | + } |
| 82 | + #endregion |
| 83 | + |
| 84 | + static void Main() |
| 85 | + { |
| 86 | + int[] digits = [1, 9, 9, 9]; |
| 87 | + |
| 88 | + Console.WriteLine(string.Join(", ", digits)); |
| 89 | + |
| 90 | + int[] result = PlusOne(digits); |
| 91 | + int[] result2 = PlusOne2(digits); |
| 92 | + |
| 93 | + Console.WriteLine(string.Join(", ", result)); |
| 94 | + Console.WriteLine(string.Join(", ", result2)); |
| 95 | + } |
| 96 | +} |
| 97 | + |
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