分析
代码
/**
* @param {ListNode} l1
* @param {ListNode} l2
* @return {ListNode}
*/
var addTwoNumbers=function(l1, l2) {
let dummyHead = new ListNode(0), node=dummyHead;
let overflow=0, a, b, c, val;
while(l1!==null || l2!==null) {
a=(l1===null)?0:l1.val;
b=(l2===null)?0:l2.val;
c=a+b+overflow;
val=c%10;
overflow=Math.floor(c/10);
node.next=new ListNode(val);
node=node.next;
if(l1!==null) l1=l1.next;
if(l2!==null) l2=l2.next;
}
if(overflow!==0) {
node.next=new ListNode(overflow);
}
return dummyHead.next;
}