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AddTwoNumbers.cpp
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89 lines (87 loc) · 2.09 KB
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//
// Created by t-tema on 6/3/2017.
//
#include <iostream>
using namespace std;
struct ListNode {
int val;
ListNode *next;
ListNode(int x) : val(x), next(NULL) {}
};
ListNode *invertList(ListNode *l);
ListNode *addLists(ListNode *l1, ListNode *l2);
/*
int main(){
ListNode *l1 = new ListNode(1);
ListNode *l2 = new ListNode(9);
//ListNode *l3 = new ListNode(3);
l1->next = l2;
//l2->next = l3;
ListNode *ll1 = new ListNode(5);
ListNode *ll2 = new ListNode(6);
ListNode *ll3 = new ListNode(7);
ll1->next = ll2;
ll2->next = ll3;
ListNode *test=addLists(l1, ll1);
while(test != NULL) {
cout<<test->val<<endl;
test=test->next;
}
}
*/
ListNode *addLists(ListNode *l1, ListNode *l2){
if (l1 == NULL) return l2;
if (l2 == NULL) return l1;
int count=0;
ListNode *head=new ListNode(1);
ListNode *ans=head;
while (l1 !=NULL && l2 != NULL) {
ListNode *temp = new ListNode((l1->val+l2->val+count)%10);
count=(l1->val+l2->val+count)/10;
head->next=temp;
head=head->next;
l1=l1->next;
l2=l2->next;
}
if (l1 != NULL) {
while(l1 != NULL) {
ListNode *temp = new ListNode((l1->val+count)%10);
count=(l1->val+count)/10;
head->next=temp;
head=head->next;
l1=l1->next;
}
}
if (l2 != NULL) {
while(l2 != NULL) {
ListNode *temp = new ListNode((l2->val+count)%10);
count=(l2->val+count)/10;
head->next=temp;
head=head->next;
l2=l2->next;
}
}
if (count==1) {
head->next=new ListNode(1);
return ans->next;
} else {
return ans->next;
}
}
ListNode *invertList(ListNode *l) {
if (l == NULL) {
return l;
}
ListNode *p = l;
ListNode *pre = NULL;
ListNode *pl = p->next;
if (pl == NULL) return l;
while (p != NULL) {
p->next = pre;
pre = p;
p = pl;
if (pl == NULL) break;
else pl = pl->next;
}
return pre;
}