Posted on Mon 02 December 2024 in Leetcode • Tagged with linked-list, two-pointers, trailing-pointer
Question Link : https://leetcode.com/problems/remove-nth-node-from-end-of-list/
Difficulty: Medium
Premium: False
Given the head of a linked list, remove the nth node from the end of the list and return its head. Example 1:
Input: head = [1,2,3,4,5], n = 2 Output: [1,2,3,5]
Example …
Posted on Fri 01 November 2024 in Leetcode • Tagged with array-shift, two-pointers
Question Link : https://leetcode.com/problems/remove-duplicates-from-sorted-array/
Difficulty: Easy
Premium: False
Given an integer array nums sorted in non-decreasing order, remove the duplicates in-place such that each unique element appears only once. The relative order of the elements should be kept the same. Then return the number of unique …
Posted on Fri 01 November 2024 in Leetcode • Tagged with two-pointers
Question Link : https://leetcode.com/problems/remove-element/
Difficulty: Easy
Premium: False
Given an integer array nums and an integer val, remove all occurrences of val in nums in-place. The order of the elements may be changed. Then return the number of elements in nums which are not equal to …
Posted on Sun 02 April 2023 in Leetcode • Tagged with two-pointers, greedy
Question Link : https://leetcode.com/problems/boats-to-save-people/
Difficulty: Medium
Premium: False
You are given an array people where people[i] is the weight of the ith person, and an infinite number of boats where each boat can carry a maximum weight of limit. Each boat carries at most two …
Posted on Mon 27 March 2023 in Leetcode • Tagged with two-pointers
Question Link : https://leetcode.com/problems/container-with-most-water/
Difficulty: Medium
Premium: False
You are given an integer array height of length n. There are n vertical lines drawn such that the two endpoints of the ith line are (i, 0) and (i, height[i]). Find two lines that together with …
Posted on Mon 05 December 2022 in Leetcode • Tagged with two-pointers
Question Link : https://leetcode.com/problems/odd-even-linked-list/
Difficulty: Medium
Premium: False
Given the head of a singly linked list, group all the nodes with odd indices together followed by the nodes with even indices, and return the reordered list. The first node is considered odd, and the second node …
Posted on Tue 08 November 2022 in Leetcode • Tagged with two-pointers
Question Link : https://leetcode.com/problems/apply-operations-to-an-array/
Difficulty: Easy
You are given a 0-indexed array nums of size n consisting of non-negative integers. You need to apply n - 1 operations to this array where, in the ith operation (0-indexed), you will apply the following on the ith element of …
Posted on Sat 05 November 2022 in Leetcode • Tagged with two-pointers
Question Link : https://leetcode.com/problems/largest-positive-integer-that-exists-with-its-negative/
Difficulty: Easy
Given an integer array nums that does not contain any zeros, find the largest positive integer k such that -k also exists in the array. Return the positive integer k. If there is no such integer, return -1. Example 1 …
Posted on Thu 03 November 2022 in Leetcode • Tagged with array-shift, two-pointers
Question Link : https://leetcode.com/problems/move-zeroes/
Difficulty: Easy
Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements. Note that you must do this in-place without making a copy of the array. Example 1: Input: nums …
Posted on Thu 03 November 2022 in Leetcode • Tagged with two-pointers, string
Question Link : https://leetcode.com/problems/reverse-vowels-of-a-string/
Difficulty: Easy
Given a string s, reverse only all the vowels in the string and return it. The vowels are 'a', 'e', 'i', 'o', and 'u', and they can appear in both lower and upper cases, more than once. Example 1: Input …