leetcode第二题

 

功能函数

typedef struct ListNode {int val;struct ListNode *next;
} ListNode;struct ListNode* addTwoNumbers(struct ListNode* l1, struct ListNode* l2) {ListNode *dummy = (ListNode *)malloc(sizeof(ListNode));ListNode *cur = dummy;int carry = 0;   //carry是进位值while(l1 || l2 || carry){int a = l1 ? l1->val : 0;  //l1为空时，a为0 //l1不为空时，a为l1->valint b = l2 ? l2->val : 0;int sum = a + b + carry;carry = sum / 10;  //carry是进位值，初始为0。cur->next = (ListNode *)malloc(sizeof(ListNode));  //从虚拟头节点创建一个节点cur = cur->next;cur->val = sum % 10;cur->next = NULL;if(l1) l1 = l1->next;if(l2) l2 = l2->next;}ListNode *head = dummy->next;  //返回结果链表（跳过虚拟头节点）free(dummy);  // 释放虚拟头节点return head; 
}

 测试代码

int main() {// 示例输入：创建两个链表 l1 和 l2ListNode* l1 = (ListNode*)malloc(sizeof(ListNode));    //动态申请一个 ListNode 结构体大小的内存块，并把这个地址赋值给指针 l1。l1->val = 2; l1->next = (ListNode*)malloc(sizeof(ListNode));l1->next->val = 4; l1->next->next = (ListNode*)malloc(sizeof(ListNode));l1->next->next->val = 3; l1->next->next->next = NULL;ListNode* l2 = (ListNode*)malloc(sizeof(ListNode));l2->val = 5; l2->next = (ListNode*)malloc(sizeof(ListNode));l2->next->val = 6; l2->next->next = (ListNode*)malloc(sizeof(ListNode));l2->next->next->val = 4; l2->next->next->next = NULL;// 调用函数并输出结果ListNode* result = addTwoNumbers(l1, l2);while (result) {printf("%d ", result->val);result = result->next;}printf("\n");return 0;
}

运行结果