LEETCODE 203

Remove all elements from a linked list of integers that have value val.

Example
Given: 1 --> 2 --> 6 --> 3 --> 4 --> 5 --> 6, val = 6
Return: 1 --> 2 --> 3 --> 4 --> 5

Credits:
Special thanks to @mithmatt for adding this problem and creating all test cases.

Subscribe to see which companies asked this question

主要是头节点的处理。可以用判断头节点的方式；我用的生成一个新节点，令其指向头节点。

/**
 * Definition for singly-linked list.
 * struct ListNode {
 *     int val;
 *     ListNode *next;
 *     ListNode(int x) : val(x), next(NULL) {}
 * };
 */
class Solution {
public:
    ListNode* removeElements(ListNode* head, int val) {
        ListNode tempHead(val+1);
        ListNode* tempPos = &tempHead;
        tempHead.next = head;
        while(tempPos->next)
        {
            if(val == tempPos->next->val)
                tempPos->next = tempPos->next->next;
            else
                tempPos = tempPos->next;
        }
        return tempHead.next;
    }
};