| | | 1 | | // -------------------------------------------------------------------------------- |
| | | 2 | | // Copyright (C) 2025 Eugene Eremeev (also known as Yevhenii Yeriemeieiv). |
| | | 3 | | // All Rights Reserved. |
| | | 4 | | // -------------------------------------------------------------------------------- |
| | | 5 | | // This software is the confidential and proprietary information of Eugene Eremeev |
| | | 6 | | // (also known as Yevhenii Yeriemeieiv) ("Confidential Information"). You shall not |
| | | 7 | | // disclose such Confidential Information and shall use it only in accordance with |
| | | 8 | | // the terms of the license agreement you entered into with Eugene Eremeev (also |
| | | 9 | | // known as Yevhenii Yeriemeieiv). |
| | | 10 | | // -------------------------------------------------------------------------------- |
| | | 11 | | |
| | | 12 | | namespace LeetCode.Algorithms.StringToInteger; |
| | | 13 | | |
| | | 14 | | /// <inheritdoc /> |
| | | 15 | | public class StringToIntegerIterative : IStringToInteger |
| | | 16 | | { |
| | | 17 | | /// <summary> |
| | | 18 | | /// Time complexity - O(n) |
| | | 19 | | /// Space complexity - O(1) |
| | | 20 | | /// </summary> |
| | | 21 | | /// <param name="s"></param> |
| | | 22 | | /// <returns></returns> |
| | | 23 | | public int MyAtoi(string s) |
| | 7 | 24 | | { |
| | 7 | 25 | | var i = 0; |
| | | 26 | | |
| | 8 | 27 | | while (i < s.Length && s[i] == ' ') |
| | 1 | 28 | | { |
| | 1 | 29 | | i++; |
| | 1 | 30 | | } |
| | | 31 | | |
| | 7 | 32 | | var sign = 1; |
| | | 33 | | |
| | 7 | 34 | | if (i < s.Length && (s[i] == '+' || s[i] == '-')) |
| | 2 | 35 | | { |
| | 2 | 36 | | if (s[i] == '-') |
| | 2 | 37 | | { |
| | 2 | 38 | | sign = -1; |
| | 2 | 39 | | } |
| | | 40 | | |
| | 2 | 41 | | i++; |
| | 2 | 42 | | } |
| | | 43 | | |
| | 7 | 44 | | long result = 0; |
| | | 45 | | |
| | 35 | 46 | | while (i < s.Length && char.IsDigit(s[i])) |
| | 30 | 47 | | { |
| | 30 | 48 | | result = (result * 10) + (s[i] - '0'); |
| | | 49 | | |
| | 30 | 50 | | switch (sign) |
| | | 51 | | { |
| | 17 | 52 | | case 1 when result > int.MaxValue: |
| | 1 | 53 | | return int.MaxValue; |
| | 13 | 54 | | case -1 when -result < int.MinValue: |
| | 1 | 55 | | return int.MinValue; |
| | | 56 | | default: |
| | 28 | 57 | | i++; |
| | 28 | 58 | | break; |
| | | 59 | | } |
| | 28 | 60 | | } |
| | | 61 | | |
| | 5 | 62 | | return (int)(sign * result); |
| | 7 | 63 | | } |
| | | 64 | | } |