← Roadmaps all linked lists problems

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Linked Lists

Reversal, fast/slow pointers, merge, reorder.

4 subtopics · 39 problems0/39 on the path solved

next ▸ Count nodes in a listmachine 1000

01

Basics & reversal

0/12

Reverse, count, sum, nth node.

○Count nodes in a listSilver · 1000 ○Value of the nth nodeSilver · 1000 ○Reverse a linked listSilver · 1050 ○Reverse A Singly Linked ListSilver · 1050 ○Delete Node By ValueSilver · 1050 ○Nth node from the endSilver · 1180 ○Remove nth node from endGold · 1380 ○Reverse And Add Two NumbersGold · 1400 ○Reverse Nodes In K GroupPlatinum · 1700 ○Add Two NumbersPlatinum · 1700 ○Reverse Linked List IIPlatinum · 1750 ○Reverse nodes in groups of kPlatinum · 1750

02

Fast & slow

0/8

Middle, cycle, nth from end, palindrome.

○Middle node valueSilver · 1100 ○Middle Of The ListSilver · 1100 ○Detect a cycleSilver · 1160 ○Linked List CycleGold · 1300 ○Delete the middle nodeGold · 1300 ○Palindrome linked listGold · 1400 ○Intersection start index of two listsGold · 1450 ○Intersection suffix lengthGold · 1540

03

Merge & sort

0/7

Merge sorted, sort list, insertion sort, k lists.

○Partition ListGold · 1320 ○Merge two sorted listsGold · 1340 ○Insertion Sort ListGold · 1340 ○Split List Into K PartsGold · 1380 ○Insertion sort the listGold · 1400 ○Split a list into k parts (sizes)Gold · 1500 ○Merge K Sorted ListsPlatinum · 1750

04

Reorder & transform

0/12

Reorder, swap pairs, rotate, partition, add.

○Remove duplicates from an unsorted listSilver · 1200 ○Remove duplicates from sorted listGold · 1320 ○Rotate ListGold · 1330 ○Reorder ListGold · 1350 ○Plus one to a number listGold · 1350 ○Odd Even Linked ListGold · 1400 ○Reorder list (L0, Ln, L1, Ln-1, ...)Gold · 1400 ○Odd-even node reorderGold · 1450 ○Partition List Around XGold · 1450 ○Double a number listGold · 1450 ○Rotate list right by kGold · 1500 ○Add two numbers as digit listsPlatinum · 1750