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Commit 66765d2

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1 parent beda2ad commit 66765d2

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6 files changed

+71
-3
lines changed

6 files changed

+71
-3
lines changed

‎lib/array/longest_common_prefix.dart‎

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String longestCommonPrefix(List<String> strs) {
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if (strs.isEmpty) {
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return '';
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}
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for (var charIndex = 0; charIndex < strs.first.length; charIndex++) {
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var char = strs.first[charIndex];
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for (var str in strs.skip(1)) {
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if (charIndex == str.length || str[charIndex] != char) {
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return strs.first.substring(0, charIndex);
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}
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}
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}
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return strs.first;
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}

‎lib/leetcode.dart‎

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library leetcode;
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export 'array/contains_duplicate.dart';
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export 'array/longest_common_prefix.dart';
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export 'array/max_profit.dart';
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export 'array/permute.dart';
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export 'array/remove_element.dart';
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export 'string/is_palindrome.dart';
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export 'string/length_of_longest_substring.dart';
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export 'string/letter_combinations.dart';
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export 'tree/binary_paths.dart';
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export 'tree/invert_tree.dart';
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export 'tree/is_same_tree.dart';
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export 'tree/is_symmetric.dart';

‎lib/tree/binary_paths.dart‎

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import 'package:leetcode/tree/tree_node.dart';
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List<String> binaryTreePaths(TreeNode? root) {
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var output = <String>[];
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void traverse(TreeNode? node, String curr) {
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if (node == null) {
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return;
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}
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curr += '${node.val}->';
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if (node.left == null && node.right == null) {
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output.add(curr.substring(0, curr.length - 2));
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return;
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}
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traverse(node.left, curr);
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traverse(node.right, curr);
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}
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traverse(root, '');
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return output;
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}

‎pubspec.yaml‎

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name: leetcode
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description: Solutions to leetcode problems in Dart.
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version: 1.0.0
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# homepage: https://www.example.com
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environment:
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sdk: '>=2.18.6 <3.0.0'
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# dependencies:
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# path: ^1.8.0
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dependencies:
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collection: ^1.17.1
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characters: ^1.2.1
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dev_dependencies:
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lints: ^2.0.0
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import 'package:leetcode/leetcode.dart';
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import 'package:test/test.dart';
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void main() {
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test('example 1', () {
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var expected = 'fl';
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expect(longestCommonPrefix(['flower', 'flow', 'flight']), equals(expected));
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});
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test('example 2', () {
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var expected = '';
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expect(longestCommonPrefix(['dog', 'racecar', 'car']), equals(expected));
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});
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}

‎test/tree/binary_paths_test.dart‎

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import 'package:leetcode/leetcode.dart';
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import 'package:test/test.dart';
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void main() {
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test('example 1', () {
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var input = TreeNode.fromList([1, 2, 3, null, 5]);
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expect(binaryTreePaths(input), equals(['1->2->5', '1->3']));
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});
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test('example 2', () {
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var input = TreeNode.fromList([1]);
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expect(binaryTreePaths(input), equals(['1']));
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});
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}

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