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Commit 16f4dd8

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solved leetcode daily challenge, reverse nodes in k-groups
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  • LeetCode/Reverse_Nodes_in_k-Group

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#include <bits/stdc++.h>
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#include <gtest/gtest.h>
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using namespace std;
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//// START
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/*
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## Reverse Nodes in k-Group
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*/
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/**
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* Definition for singly-linked list.
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*/
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struct ListNode {
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int val;
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ListNode *next;
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ListNode() : val(0), next(nullptr) {}
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ListNode(int x) : val(x), next(nullptr) {}
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ListNode(int x, ListNode *next) : val(x), next(next) {}
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};
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class Solution {
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public:
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ListNode *reverseKGroup(ListNode *head, int k) {
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if (!head) return nullptr;
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if (k == 1) return head;
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int i = 0;
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ListNode *tail = head;
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while (tail) {
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i++;
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if (i == k) break;
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tail = tail->next;
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}
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if (i < k) return head;
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auto *nn = tail->next;
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ListNode *last = nullptr;
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ListNode *cur = head;
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int ki = 0;
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while (ki < k) {
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ListNode *tmp = cur->next;
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cur->next = last;
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last = cur;
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cur = tmp;
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ki++;
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}
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head->next = reverseKGroup(nn, k);
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return tail;
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}
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};
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//// END
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struct T {
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};
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TEST(Solution, test) {
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T ts[] = {
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{
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},
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{
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},
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};
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for (T t : ts) {
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Solution solution;
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}
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}
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int main() {
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testing::InitGoogleTest();
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return RUN_ALL_TESTS();
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}
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