LeetCode:2.两数相加(add two numbers) 题解与思路 谁能想到,我居然被链表的输入给折磨了这么久!
import java.util.*;
public class LC2AddTwoNumbers
{
public static class ListNode {
int val;
ListNode next;
ListNode() {}
ListNode(int val) { this.val = val; }
ListNode(int val, ListNode next) { this.val = val; this.next = next; }
}
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
String[] strs=sc.nextLine().split(",");
String[] strs2=sc.nextLine().split(",");
ListNode l1=new ListNode();
ListNode nextNode;
nextNode=l1;
ListNode l2=new ListNode();
ListNode nextNode2;
nextNode2=l2;
for(int i=0;i<strs.length;i++){
ListNode node=new ListNode(Integer.parseInt(strs[i]));
nextNode.next=node;
nextNode=nextNode.next;
}
nextNode=l1;
for(int i=0;i<strs2.length;i++){
ListNode node=new ListNode(Integer.parseInt(strs2[i]));
nextNode2.next=node;
nextNode2=nextNode2.next;
}
nextNode2=l2;
ListNode listNode=addTwoNumbers(l1,l2);
listNode=listNode.next;
System.out.print(listNode.val);
listNode=listNode.next;
while(listNode!=null){
System.out.print(","+listNode.val);
listNode=listNode.next;
}
}
public static ListNode addTwoNumbers(ListNode l1, ListNode l2){
ListNode head=null,tail=null;
int carry=0;
while(l1!=null||l2!=null){
int n1=l1!=null?l1.val:0;
int n2=l2!=null?l2.val:0;
int sum=n1+n2+carry;
if(head==null){
head=tail=new ListNode(sum%10);
}else{
tail.next=new ListNode(sum%10);
tail=tail.next;
}
carry=sum>9?1:0;
if(l1!=null){
l1=l1.next;
}
if(l2!=null){
l2=l2.next;
}
}
if(carry>0){
tail.next=new ListNode(carry);
}
return head;
}
}
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