题解 | #单链表的排序#
单链表的排序
https://www.nowcoder.com/practice/f23604257af94d939848729b1a5cda08
/** * struct ListNode { * int val; * struct ListNode *next; * ListNode(int x) : val(x), next(nullptr) {} * }; */ #include <algorithm> class Solution { public: /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可 * * * @param head ListNode类 the head node * @return ListNode类 */ ListNode* sortInList(ListNode* head) { // write code here auto Size = [&head](){ int cnt = 0; for(auto cur = head; cur; cur = cur->next) { cnt ++; } return cnt; }; std::vector<int> li; li.reserve(Size()); for(auto cur = head; cur; cur = cur->next) { li.emplace_back(cur->val); } sort(li.begin(), li.end()); // 如何并行遍历? for(auto [vit, lit] = std::make_pair(li.cbegin(), head); lit; ++vit, lit = lit->next) { lit->val = *vit; } return head; } };