原创 Intersection of Two Linked Lists
Write a program to find the node at which the intersection of two singly linked lists begins. For example, the fol
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原创 Largest Number @leetCode
Given a list of non negative integers, arrange them such that they form the largest number. For example, given [3,
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原创 Container With Most Water
Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical line
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原创 Implement strStr()
Implement strStr(). Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part o
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原创 Valid Sudoku
Determine if a Sudoku is valid, according to: Sudoku Puzzles - The Rules. The Sudoku board could be partially fill
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原创 Evaluate Reverse Polish Notation
Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, /. Each
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原创 4Sum
Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all
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原创 Letter Combinations of a Phone Number
Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit
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原创 String to Integer (atoi)
Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a
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原创 Combinations
Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. For example, If n = 4 an
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原创 Swap Nodes in Pairs
Given a linked list, swap every two adjacent nodes and return its head. For example, Given 1->2->3->4, you should
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原创 Sudoku Solver
rite a program to solve a Sudoku puzzle by filling the empty cells. Empty cells are indicated by the character '.'.
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原创 Maximum Gap
Given an unsorted array, find the maximum difference between the successive elements in its sorted form. Try to solve
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原创 Majority Element
Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2
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原创 Contains Duplicate III
Given an array of integers, find out whether there are two distinct indices i and j in the array such that the dif
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