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

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1.4 KiB

/**
* File: linear_search.c
* Created Time: 2023-03-19
* Author: Guanngxu (446678850@qq.com)
*/
#include "../include/include.h"
/* 线性查找(数组) */
int linearSearchArray(int *nums, int len, int target) {
// 遍历数组
for (int i = 0; i < len; 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* linearSearchLinkedList(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;
}
// 未找到目标节点,返回 NULL
return NULL;
}
/* Driver Code */
int main() {
int target = 3;
/* 在数组中执行线性查找 */
int nums[10] = { 1, 5, 3, 2, 4, 7, 5, 9, 10, 8 };
int index = linearSearchArray(nums, 10, target);
printf("目标元素 3 的索引 = %d\n", index);
/* 在链表中执行线性查找 */
ListNode* head = arrToLinkedList(nums, 10);
ListNode* node = linearSearchLinkedList(head, target);
if(node == NULL) {
printf("目标节点值 3 的对应节点对象为 NULL\n");
} else {
printf("目标节点值 3 的对应节点对象为 addr: %p val: %d\n", node, node->val);
}
return 0;
}