hello-algo/codes/dart/chapter_searching/linear_search.dart

48 lines
1.2 KiB
Dart
Raw Normal View History

/**
* File: linear_search.dart
* Created Time: 2023-05-12
* Author: Jefferson (JeffersonHuang77@gmail.com)
*/
import '../utils/list_node.dart';
/* 线性查找(数组) */
int linearSearchArray(List<int> nums, int target) {
// 遍历数组
for (int i = 0; i < nums.length; i++) {
// 找到目标元素,返回其索引
if (nums[i] == target) {
return i;
}
}
// 未找到目标元素,返回 -1
return -1;
}
/* 线性查找(链表) */
ListNode? linearSearchList(ListNode? head, int target) {
// 遍历链表
while (head != null) {
// 找到目标节点,返回之
if (head.val == target)
return head;
head = head.next;
}
// 未找到目标元素,返回 null
return null;
}
/* Driver Code */
void main(){
int target = 3;
/* 在数组中执行线性查找 */
List<int> nums = [1, 5, 3, 2, 4, 7, 5, 9, 10, 8];
int index = linearSearchArray(nums, target);
print('目标元素 3 的索引 = $index');
/* 在链表中执行线性查找 */
ListNode? head = listToLinkedList(nums);
ListNode? node = linearSearchList(head, target);
print('目标节点值 3 的对应节点对象为 $node');
}