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Add missing Dart codes and fix some errors (#689)

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* Add missing Dart codes and fix some errors

* Update array_binary_tree.dart

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Co-authored-by: Yudong Jin <krahets@163.com>
This commit is contained in:
liuyuxin
2023-08-17 05:04:38 +08:00
committed by GitHub
parent 5d7e0a59b1
commit 0858ab91c0
14 changed files with 504 additions and 204 deletions
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3
codes/dart/chapter_searching/two_sum.dart
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@@ -9,6 +9,7 @@ import 'dart:collection';
/* 方法一： 暴力枚举 */
List<int> twoSumBruteForce(List<int> nums, int target) {
int size = nums.length;
// 两层循环，时间复杂度 O(n^2)
for (var i = 0; i < size - 1; i++) {
for (var j = i + 1; j < size; j++) {
if (nums[i] + nums[j] == target) return [i, j];
@@ -20,7 +21,9 @@ List<int> twoSumBruteForce(List<int> nums, int target) {
/* 方法二： 辅助哈希表 */
List<int> twoSumHashTable(List<int> nums, int target) {
int size = nums.length;
// 辅助哈希表，空间复杂度 O(n)
Map<int, int> dic = HashMap();
// 单层循环，时间复杂度 O(n)
for (var i = 0; i < size; i++) {
if (dic.containsKey(target - nums[i])) {
return [dic[target - nums[i]]!, i];