-
Notifications
You must be signed in to change notification settings - Fork 1
/
Add two numbers represented by linked lists.cpp
62 lines (49 loc) · 1.26 KB
/
Add two numbers represented by linked lists.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
class Solution
{
public:
Node* rev(Node *head){
Node *cur=head;
Node *prev=NULL;
Node *after=NULL;
while(cur!=NULL){
after=cur->next;
cur->next=prev;
prev=cur;
cur=after;
}
return prev;
}
Node* addTwoLists(struct Node* num1, struct Node* num2)
{
// code here
if(num1==NULL)
return num2;
if(num2==NULL)
return num1;
Node *temp=new Node(-1);
Node *cur=temp;
Node *l1=rev(num1);
Node *l2=rev(num2);
int carry=0;
while((l1!=NULL || l2!=NULL) || carry){
int sum=0;
if(l1!=NULL){
sum+=l1->data;
l1=l1->next;
}
if(l2!=NULL){
sum+=l2->data;
l2=l2->next;
}
sum+=carry;
carry=sum/10;
Node *node=new Node(sum%10);
cur->next=node;
cur=cur->next;
}
temp=rev(temp->next);
while(temp->data==0 && temp->next!=NULL)
temp=temp->next;
return temp;
}
};