LeetCode OJ Insertion Sort List

Sort a linked list using insertion sort.

class Solution {public:    ListNode *insertionSortList(ListNode *head) {        for (ListNode *temp_1 = head; temp_1 != NULL; temp_1 = temp_1->next) {            int min = temp_1->val;            ListNode *remem = temp_1;            for (ListNode *temp_2 = temp_1->next; temp_2 != NULL; temp_2 = temp_2->next) {                if (temp_2->val < min) {                    min = temp_2->val;                    remem = temp_2;                }            }            remem->val = temp_1->val;            temp_1->val = min;        }        return head;    }};