|
1 | 1 | package com.fishercoder.solutions;
|
2 | 2 |
|
3 |
| -/** |
4 |
| - * 65. Valid Number |
5 |
| - * |
6 |
| - * Validate if a given string is numeric. |
7 |
| - * |
8 |
| - * Some examples: "0" => true " 0.1 " => true "abc" => false "1 a" => false "2e10" => true |
9 |
| - * |
10 |
| - * Note: It is intended for the problem statement to be ambiguous. You should gather all |
11 |
| - * requirements up front before implementing one. |
12 |
| - */ |
13 |
| - |
14 | 3 | public class _65 {
|
15 |
| - /**credit: https://discuss.leetcode.com/topic/9490/clear-java-solution-with-ifs*/ |
16 |
| - public static class Solution1 { |
17 |
| - public boolean isNumber(String s) { |
18 |
| - s = s.trim(); |
| 4 | + /** |
| 5 | + * credit: https://discuss.leetcode.com/topic/9490/clear-java-solution-with-ifs |
| 6 | + */ |
| 7 | + public static class Solution1 { |
| 8 | + public boolean isNumber(String s) { |
| 9 | + s = s.trim(); |
19 | 10 |
|
20 |
| - boolean pointSeen = false; |
21 |
| - boolean eSeen = false; |
22 |
| - boolean numberSeen = false; |
23 |
| - boolean numberAfterE = true; |
24 |
| - for (int i = 0; i < s.length(); i++) { |
25 |
| - if ('0' <= s.charAt(i) && s.charAt(i) <= '9') { |
26 |
| - numberSeen = true; |
27 |
| - numberAfterE = true; |
28 |
| - } else if (s.charAt(i) == '.') { |
29 |
| - if (eSeen || pointSeen) { |
30 |
| - return false; |
31 |
| - } |
32 |
| - pointSeen = true; |
33 |
| - } else if (s.charAt(i) == 'e') { |
34 |
| - if (eSeen || !numberSeen) { |
35 |
| - return false; |
36 |
| - } |
37 |
| - numberAfterE = false; |
38 |
| - eSeen = true; |
39 |
| - } else if (s.charAt(i) == '-' || s.charAt(i) == '+') { |
40 |
| - if (i != 0 && s.charAt(i - 1) != 'e') { |
41 |
| - return false; |
42 |
| - } |
43 |
| - } else { |
44 |
| - return false; |
45 |
| - } |
46 |
| - } |
| 11 | + boolean pointSeen = false; |
| 12 | + boolean eSeen = false; |
| 13 | + boolean numberSeen = false; |
| 14 | + boolean numberAfterE = true; |
| 15 | + for (int i = 0; i < s.length(); i++) { |
| 16 | + if ('0' <= s.charAt(i) && s.charAt(i) <= '9') { |
| 17 | + numberSeen = true; |
| 18 | + numberAfterE = true; |
| 19 | + } else if (s.charAt(i) == '.') { |
| 20 | + if (eSeen || pointSeen) { |
| 21 | + return false; |
| 22 | + } |
| 23 | + pointSeen = true; |
| 24 | + } else if (s.charAt(i) == 'e') { |
| 25 | + if (eSeen || !numberSeen) { |
| 26 | + return false; |
| 27 | + } |
| 28 | + numberAfterE = false; |
| 29 | + eSeen = true; |
| 30 | + } else if (s.charAt(i) == '-' || s.charAt(i) == '+') { |
| 31 | + if (i != 0 && s.charAt(i - 1) != 'e') { |
| 32 | + return false; |
| 33 | + } |
| 34 | + } else { |
| 35 | + return false; |
| 36 | + } |
| 37 | + } |
47 | 38 |
|
48 |
| - return numberSeen && numberAfterE; |
| 39 | + return numberSeen && numberAfterE; |
| 40 | + } |
49 | 41 | }
|
50 |
| - } |
51 | 42 |
|
52 |
| - public static class Solution2 { |
53 |
| - /** credit: https://discuss.leetcode.com/topic/2973/java-solution-with-one-line */ |
54 |
| - public boolean isNumber(String s) { |
55 |
| - return s.matches("(\\s*)[+-]?((\\.[0-9]+)|([0-9]+(\\.[0-9]*)?))(e[+-]?[0-9]+)?(\\s*)"); |
| 43 | + public static class Solution2 { |
| 44 | + /** |
| 45 | + * credit: https://discuss.leetcode.com/topic/2973/java-solution-with-one-line |
| 46 | + */ |
| 47 | + public boolean isNumber(String s) { |
| 48 | + return s.matches("(\\s*)[+-]?((\\.[0-9]+)|([0-9]+(\\.[0-9]*)?))(e[+-]?[0-9]+)?(\\s*)"); |
| 49 | + } |
56 | 50 | }
|
57 |
| - } |
58 | 51 | }
|
0 commit comments