Leetcode #2 - Add Two Numbers (Solution)

[rayprusia]

You do a good job explaining how to solve a problem.

[tripathi]

man you are o good at explaining this, please upload more .

[Abhishek]

You explain it so well ! Please do more leetcode explanations

[mahsaz]

Thank you for the explanation. Can you explain why newlist.next gives all the digits of the sum (708) rather than only the first digit of the sum which is 7. How come "next" gives the whole list of values?

[The-Entelechy]

just getting started with relearning linked lists. How does the created list solution get connected back to ret.next

I can visualize how curr.next makes a new node and setting curr=curr.next shifts the pointer to the new node for the next iteration. Is it from a background function I don't see, or is it just how returns work and that's what I need to study. Thank you!

[shahzadkarim]

for the carry, totalsum / 10 gives a non integer, should you not use int(totalsum/10)?

[prashanthnaik]

does this work when the li = [5] and l2 = [5] ? I was trying the same in JS, and it fails for this test case.. here is my code






var tempList = new ListNode(0);
var head = tempList;
var sum = 0;
var carry = 0;

while (l1 || l2) {
if (l1) {
sum += l1.val; // 3
l1 = l1.next; // 4 node
}

if (l2) {
sum += l2.val; // 3+4=7
l2 = l2.next; // 6 node
}

sum = sum + carry; // 7+0=7
carry = Math.floor(sum/10); // 0

head.next = new ListNode(sum % 10); // 7
sum = 0;
head = head.next; // 7
}

return tempList.next;