Title: two numbers together
Link to the original question: two numbers together
The question is not complicated, but I think the same problem - the amount of code to reflect a very human level of programming:
His first to do the amount of code is like this (could not bear to look ~ ~):
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
ListNode *head = new ListNode();
ListNode *p = head;
int temp = 0;
while(l1 != NULL && l2 != NULL)
{
ListNode *q = new ListNode();
p->next = q;
p = p->next;
temp = l1->val + l2->val + temp;
if(temp < 10)
{
p->val = temp;
temp = 0;
}
else
{
p->val = temp - 10;
temp = 1;
}
l1 = l1->next;
l2 = l2->next;
}
while(l1 != NULL)
{
ListNode *q = new ListNode();
p->next = q;
p = p->next;
temp = l1->val + temp;
if(temp < 10)
{
p->val = temp;
temp = 0;
}
else
{
p->val = temp - 10;
temp = 1;
}
l1 = l1->next;
}
while(l2 != NULL)
{
ListNode *q = new ListNode();
p->next = q;
p = p->next;
temp = l2->val + temp;
if(temp < 10)
{
p->val = temp;
temp = 0;
}
else
{
p->val = temp - 10;
temp = 1;
}
l2 = l2->next;
}
if(temp == 1)
{
ListNode *q = new ListNode();
p->next = q;
p = p->next;
p->val = 1;
}
return head->next;
}
};
This is clearly not a time elegant code, then looked to find the official answer, and she looks refreshed. as follows:
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode* addTwoNumbers(ListNode* l1, ListNode* l2) {
ListNode *head = new ListNode();
ListNode *p = head;
int carry = 0;
while(l1 != NULL || l2 != NULL)
{
int x = (l1 != NULL)?l1->val:0;
int y = (l2 != NULL)?l2->val:0;
int sum = carry + x + y;
p->next = new ListNode(sum % 10);
p = p->next;
carry = sum / 10;
if(l1 != NULL) l1 = l1->next;
if(l2 != NULL) l2 = l2->next;
}
if(carry != 0)
p->next =new ListNode(1);
return head->next;
}
};
Given that official java, I put him converted to C ++. Looks really quite beautiful ~
Digression:
He said the United States will spend some say "there are not beautiful flower," is expected to have such complaints, then wrote: "there are both beautiful flower is not beautiful flowers." This is basically nonsense, so that everyone agrees text can not be called expression.
- Koji Suzuki
