The “Design Linked\u00a0List” problem\u00a0is a fundamental\u00a0data structure\u00a0question that\u00a0tests your understanding\u00a0of how linked\u00a0lists work and\u00a0how to implement\u00a0them from scratch.<\/p>\n\n\n\n
In this blog, we\u2019ll explain\u00a0the problem, the\u00a0intuition behind\u00a0each method, and\u00a0walk through\u00a0the implementation\u00a0step by step, making it easy\u00a0to follow for\u00a0students and\u00a0beginners.<\/p>\n\n\n\n
Here’s the [Problem Link<\/span><\/mark><\/a><\/strong>] to begin with.<\/p>\n\n\n You have to design your own singly linked list<\/strong>. Implement the following methods:<\/p>\n\n\n\n Input:<\/strong><\/p>\n\n\n\nWhat Does the Problem Say?<\/h2>\n\n\n\n
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get(index)<\/code>: Get the value of the index-th node. If the index is invalid, return -1.<\/li>\n\n\n\naddAtHead(val)<\/code>: Add a node of value\u00a0val<\/code>\u00a0before the first node.<\/li>\n\n\n\naddAtTail(val)<\/code>: Append a node of value\u00a0val<\/code>\u00a0as the last node.<\/li>\n\n\n\naddAtIndex(index, val)<\/code>: Add a node of value\u00a0val<\/code>\u00a0before the index-th node.<\/li>\n\n\n\ndeleteAtIndex(index)<\/code>: Delete the index-th node in the list if the index is valid.<\/li>\n<\/ul>\n\n\n\nExample<\/h3>\n\n\n\n