Valid Parentheses LeetCode Solution
Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid.
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Regular Expression Matching LeetCode Solution
Given an input string s and a pattern p, implement regular expression matching with support for ‘.’ and ‘*’ where ‘.’ Matches any single character and ‘*’ Matches zero or more of the preceding element.
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Leetcode SolutionNim Game LeetCode Solution
Given n, the number of stones in the heap, return true if you can win the game assuming both you and your friend play optimally, otherwise return false.
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Leetcode SolutionDelete Node in a Linked List LeetCode Solution
There is a singly-linked list head and we want to delete a node node in it. Delete the given node
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Leetcode SolutionReverse Linked List LeetCode Solution
Given the head of a singly linked list, reverse the list, and return the reversed list.
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Leetcode SolutionClimbing Stairs LeetCode Solution
You are climbing a staircase. It takes n steps to reach the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top?
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Leetcode SolutionMerge Two Sorted Lists LeetCode Solution
You are given the heads of two sorted linked lists list1 and list2. Merge the two lists in a one sorted list. The list should be made by splicing together the nodes of the first two lists. Return the head of the merged linked list.
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Leetcode SolutionReverse Nodes in k-Group LeetCode Solution
Given the head of a linked list, reverse the nodes of the list k at a time, and return the modified list.
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Leetcode SolutionRemove Element LeetCode Solution
Given an integer array nums and an integer val, remove all occurrences of val in nums in-place. The relative order of the elements may be changed.
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Leetcode SolutionFind the Index of the First Occurrence in a String LeetCode Solution
Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
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Leetcode SolutionDivide Two Integers LeetCode Solution
Given two integers dividend and divisor, divide two integers without using multiplication, division, and mod operator. Return the quotient after dividing dividend by divisor.
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Leetcode SolutionSubstring with Concatenation of All Words LeetCode Solution
You are given a string s and an array of strings words. All the strings of words are of the same length. Return the starting indices of all the concatenated substrings in s. You can return the answer in any order.
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Leetcode SolutionNext Permutation LeetCode Solution
Given an array of integers nums, find the next permutation of nums.
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Leetcode SolutionSearch in Rotated Sorted Array LeetCode Solution
Given the array nums after the possible rotation and an integer target, return the index of target if it is in nums, or -1 if it is not in nums.
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Leetcode SolutionSudoku Solver LeetCode Solution
Write a program to solve a Sudoku puzzle by filling the empty cells.
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