leetcode - 面试题 02.05. 链表求和

题目

代码

#include <iostream>
#include <vector>
using namespace std;

typedef struct ListNode {
	int val;
	struct ListNode *next;
}ListNode, *LinkList;

void create(LinkList &head){
	int n;
	cin>>n;
	head = new ListNode;
	head->next = NULL;
	ListNode *tail = head;
	for(int i = 0; i < n; i++){
		ListNode *p = new ListNode;
		cin>>p->val;
		p->next = NULL;
		tail->next = p;
		tail = p;
	}
}

ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
	int sum = 0, flag = 0, num = 0;
	int x, y;
	ListNode *head = new ListNode;
	head->next = NULL;
	ListNode *tail = head;
	while(l1 || l2 || flag){
		if(l1){
			x = l1->val;
			l1 = l1->next;
		}else{
			x = 0;
		}
		if(l2){
			y = l2->val;
			l2 = l2->next;
		}else{
			y = 0;
		}
		sum = x + y + flag;
		flag = sum / 10;
		num = sum % 10;
		ListNode *p = new ListNode;
		p->val = num;
		p->next = NULL;
		tail->next = p;
		tail = p;
	}
	return head->next;
}

int main(){
	ListNode *l1, *l2, *res; 
	create(l1);
	create(l2);
	l1 = l1->next;
	l2 = l2->next;
	res = addTwoNumbers(l1, l2);
	while(res){
		cout<<res->val<<" ";
		res = res->next;
	}
    return 0;
}

最后

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