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| 1 | +// https://leetcode.com/problems/valid-parentheses/description/ |
| 2 | +import 'package:test/test.dart'; |
| 3 | + |
| 4 | +void main(List<String> args) { |
| 5 | + final stopwatch = Stopwatch()..start(); |
| 6 | + runTests(); |
| 7 | + |
| 8 | + stopwatch.stop(); |
| 9 | + print('Function Execution Time : ${stopwatch.elapsedMicroseconds} micro s'); |
| 10 | +} |
| 11 | + |
| 12 | +class Solution { |
| 13 | + ////! Solved From the first time |
| 14 | + bool isValid(String s) { |
| 15 | + List<int> brackets = []; |
| 16 | + int openCurlyBracket = '{'.codeUnits[0]; |
| 17 | + int openSquareBracket = '['.codeUnits[0]; |
| 18 | + int openRoundBracket = '('.codeUnits[0]; |
| 19 | + |
| 20 | + int closeCurlyBracket = '}'.codeUnits[0]; |
| 21 | + int closeSquareBracket = ']'.codeUnits[0]; |
| 22 | + int closeRoundBracket = ')'.codeUnits[0]; |
| 23 | + |
| 24 | + for (final currentBracket in s.codeUnits) { |
| 25 | + if (currentBracket == openRoundBracket || |
| 26 | + currentBracket == openSquareBracket || |
| 27 | + currentBracket == openCurlyBracket) { |
| 28 | + brackets.add(currentBracket); |
| 29 | + |
| 30 | + /// Make sure that the brackets is not empty |
| 31 | + /// before get the last one |
| 32 | + } else if (brackets.isNotEmpty) { |
| 33 | + int lastAddedBracket = brackets.last; |
| 34 | + bool isCloseRight = (lastAddedBracket == openCurlyBracket && |
| 35 | + currentBracket == closeCurlyBracket) || |
| 36 | + (lastAddedBracket == openSquareBracket && |
| 37 | + currentBracket == closeSquareBracket) || |
| 38 | + (lastAddedBracket == openRoundBracket && |
| 39 | + currentBracket == closeRoundBracket); |
| 40 | + |
| 41 | + if (isCloseRight) { |
| 42 | + brackets.removeLast(); |
| 43 | + } else { |
| 44 | + return false; |
| 45 | + } |
| 46 | + } else { |
| 47 | + return false; |
| 48 | + } |
| 49 | + } |
| 50 | + |
| 51 | + return brackets.isEmpty; |
| 52 | + } |
| 53 | +} |
| 54 | + |
| 55 | +void runTests() { |
| 56 | + final Solution s = Solution(); |
| 57 | + |
| 58 | + group('Valid Parentheses', () { |
| 59 | + // Basic examples from problem statement |
| 60 | + test('Example 1: "()" → true', () { |
| 61 | + expect(s.isValid("()"), isTrue); |
| 62 | + }); |
| 63 | + |
| 64 | + test('Example 2: "()[]{}" → true', () { |
| 65 | + expect(s.isValid("()[]{}"), isTrue); |
| 66 | + }); |
| 67 | + |
| 68 | + test('Example 3: "(]" → false', () { |
| 69 | + expect(s.isValid("(]"), isFalse); |
| 70 | + }); |
| 71 | + |
| 72 | + test('Example 4: "([])" → true', () { |
| 73 | + expect(s.isValid("([])"), isTrue); |
| 74 | + }); |
| 75 | + |
| 76 | + // Edge cases |
| 77 | + test('Empty string: "" → true', () { |
| 78 | + expect(s.isValid(""), isTrue); |
| 79 | + }); |
| 80 | + |
| 81 | + test('Single opening: "(" → false', () { |
| 82 | + expect(s.isValid("("), isFalse); |
| 83 | + }); |
| 84 | + |
| 85 | + test('Single closing: ")" → false', () { |
| 86 | + expect(s.isValid(")"), isFalse); |
| 87 | + }); |
| 88 | + |
| 89 | + // Nested cases |
| 90 | + test('Nested valid: "{[]}" → true', () { |
| 91 | + expect(s.isValid("{[]}"), isTrue); |
| 92 | + }); |
| 93 | + |
| 94 | + test('Nested invalid: "{[}]" → false', () { |
| 95 | + expect(s.isValid("{[}]"), isFalse); |
| 96 | + }); |
| 97 | + |
| 98 | + // Mixed valid cases |
| 99 | + test('Mixed valid: "(){}[]" → true', () { |
| 100 | + expect(s.isValid("(){}[]"), isTrue); |
| 101 | + }); |
| 102 | + |
| 103 | + test('Mixed valid complex: "({[]})" → true', () { |
| 104 | + expect(s.isValid("({[]})"), isTrue); |
| 105 | + }); |
| 106 | + |
| 107 | + // Mixed invalid cases |
| 108 | + test('Mixed invalid: "(}" → false', () { |
| 109 | + expect(s.isValid("(}"), isFalse); |
| 110 | + }); |
| 111 | + |
| 112 | + test('Mixed invalid complex: "({[}])" → false', () { |
| 113 | + expect(s.isValid("({[}])"), isFalse); |
| 114 | + }); |
| 115 | + |
| 116 | + // Large strings |
| 117 | + test('Large valid string', () { |
| 118 | + final str = List.filled(5000, '(').join() + List.filled(5000, ')').join(); |
| 119 | + expect(s.isValid(str), isTrue); |
| 120 | + }); |
| 121 | + |
| 122 | + test('Large invalid string', () { |
| 123 | + final str = List.filled(5000, '(').join() + List.filled(4999, ')').join(); |
| 124 | + expect(s.isValid(str), isFalse); |
| 125 | + }); |
| 126 | + |
| 127 | + test('Maximum length invalid', () { |
| 128 | + final str = List.generate(10000, (i) => ['(', '[', '{'][i % 3]).join(); |
| 129 | + expect(s.isValid(str), isFalse); |
| 130 | + }); |
| 131 | + |
| 132 | + // Random cases |
| 133 | + test('Random valid 1: "[({})]()" → true', () { |
| 134 | + expect(s.isValid("[({})]()"), isTrue); |
| 135 | + }); |
| 136 | + |
| 137 | + test('Random invalid 1: "[(])" → false', () { |
| 138 | + expect(s.isValid("[(])"), isFalse); |
| 139 | + }); |
| 140 | + |
| 141 | + // Special cases |
| 142 | + test('Only opening brackets: "{[(" → false', () { |
| 143 | + expect(s.isValid("{[("), isFalse); |
| 144 | + }); |
| 145 | + |
| 146 | + test('Only closing brackets: ")}]" → false', () { |
| 147 | + expect(s.isValid(")}]"), isFalse); |
| 148 | + }); |
| 149 | + |
| 150 | + test('Interleaved brackets: "([)]" → false', () { |
| 151 | + expect(s.isValid("([)]"), isFalse); |
| 152 | + }); |
| 153 | + }); |
| 154 | +} |
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