Lunski's Clutter

Given the head of a linked list, remove the nth node from the end of the list and return its head.

Follow up: Could you do this in one pass?

Example 1:

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Input: head = [1,2,3,4,5], n = 2
Output: [1,2,3,5]

Example 2:

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Input: head = [1], n = 1
Output: []

Example 3:

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Input: head = [1,2], n = 1
Output: [1]

Given n non-negative integers a1, a2, …, an , where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of the line i is at (i, ai) and (i, 0). Find two lines, which, together with the x-axis forms a container, such that the container contains the most water.

Example 1:

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Input: height = [1,8,6,2,5,4,8,3,7]
Output: 49
Explanation: The above vertical lines are represented by array [1,8,6,2,5,4,8,3,7]. In this case, the max area of water (blue section) the container can contain is 49.

Example 2:

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Input: height = [1,1]
Output: 1

Example 3:

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Input: height = [4,3,2,1,4]
Output: 16

Example 4:

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Input: height = [1,2,1]
Output: 2

Given two strings s and t, return true if s is a subsequence of t, or false otherwise.

A subsequence of a string is a new string that is formed from the original string by deleting some (can be none) of the characters without disturbing the relative positions of the remaining characters. (i.e., “ace” is a subsequence of “abcde” while “aec” is not).

Example 1:

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Input: s = "abc", t = "ahbgdc"
Output: true

Example 2:

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Input: s = "axc", t = "ahbgdc"
Output: false

Given a string s, return the longest palindromic substring in s.

Example 1:

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Input: s = "babad"
Output: "bab"
Note: "aba" is also a valid answer.

Example 2:

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Input: s = "cbbd"
Output: "bb"

Example 3:

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Input: s = "a"
Output: "a"

Example 4:

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Input: s = "ac"
Output: "a"

Given a string s, find the length of the longest substring without repeating characters.

Example 1:

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Input: s = "abcabcbb"
Output: 3
Explanation: The answer is "abc", with the length of 3.

Example 2:

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Input: s = "bbbbb"
Output: 1
Explanation: The answer is "b", with the length of 1.

Example 3:

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Input: s = "pwwkew"
Output: 3
Explanation: The answer is "wke", with the length of 3.
Notice that the answer must be a substring, "pwke" is a subsequence and not a substring.

Example 4:

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Input: s = ""
Output: 0