LeetCode

Total Accepted: 8828 Total Submissions: 32877 Given a collection of integers that might contain duplicates, S, return all possible subsets. Note: Elements in a subset must be in non-descending

Total Accepted: 14158 Total Submissions: 41204 Given a binary tree, return the inorder traversal of its nodes' values. For example: Given binary tree {1,#,2,3}, 1 \ 2 / 3

Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3, Return [1,3,3,1]. Note: Could you optimize your algorithm to use only O(k) extra space?

Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5, Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ]

Total Accepted: 10982 Total Submissions: 40794 My Submissions

Total Accepted: 9269 Total Submissions: 36157 Given a string s, partition s such that every substring of the partition is a palindrome. Return all possible palindrome partitioning of s. Fo

Total Accepted: 9937 Total Submissions: 35192 Given a string s consists of upper/lower-case alphabets and empty space characters ' ', return the length of last word in the string. If the las

Total Accepted: 14158 Total Submissions: 41204

Total Accepted: 14712 Total Submissions: 42788

Total Accepted: 10163 Total Submissions: 33266 Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Follow up: Can you solve it without using extra space?

Total Accepted: 14403 Total Submissions: 41497 Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space?

Total Accepted: 9100 Total Submissions: 29949 Given a non-negative number represented as an array of digits, plus one to the number. The digits are stored such that the most significant digit is at

Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space for another array, you must do this in place with c

Total Accepted: 11612 Total Submissions: 39946 Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest le

Total Accepted: 9875 Total Submissions: 31987 Given a binary tree, return the bottom-up level order traversal of its nodes' values. (ie, from left to right, level by level from leaf to root).

Total Accepted: 12661 Total Submissions: 40912 Given an array with n objects colored red, white or blue, sort them so that objects of the same color are adjacent, with the colors in the order r

Total Accepted: 11464 Total Submissions: 40857

You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can you climb to the top public class Solution { publ

Total Accepted: 9992 Total Submissions: 32850 A robot is located at the top-left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or right at any poi

Total Accepted: 10516 Total Submissions: 35090

Total Accepted: 10972 Total Submissions: 40240

Total Accepted: 12737 Total Submissions: 41350

Total Accepted: 9767 Total Submissions: 37455 Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. The same repeat

Total Accepted: 8649 Total Submissions: 35072

Total Accepted: 12950 Total Submissions: 78829 Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the s

Given an array of integers, find two numbers such that they add up to a specific target number. The function twoSum should return indices of the two numbers such that they add up to the target, whe

Total Accepted: 9118 Total Submissions: 33975 Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three intege

Total Accepted: 7469 Total Submissions: 43163 Given a string s, partition s such that every substring of the partition is a palindrome. Return the minimum cuts needed for a palindrome partit

Total Accepted: 7130 Total Submissions: 35672 Given a string containing only digits, restore it by returning all possible valid IP address combinations. For example: Given "25525511135", re

Total Accepted: 12012 Total Submissions: 41212 Determine whether an integer is a palindrome. Do this without extra space. click to show spoilers. Some hints: Could negative integers be p

Total Accepted: 12041 Total Submissions: 39526 Given a binary tree, return the level order traversal of its nodes' values. (ie, from left to right, level by level). For example: Given binary

Total Accepted: 8508 Total Submissions: 30322 Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after raini

Total Accepted: 7942 Total Submissions: 26120 You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Follow up: Could you do this in-place? public cla

Total Accepted: 7514 Total Submissions: 27719 Follow up for "Unique Paths": Now consider if some obstacles are added to the grids. How many unique paths would there be? An obstacle and empty space

Follow up for "Remove Duplicates": What if duplicates are allowed at most twice? For example, Given sorted array A = [1,1,1,2,2,3], Your function should return length = 5, and A is now [1,1,2,2,

Total Accepted: 10415 Total Submissions: 37624 Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. The brackets must clos

Total Accepted: 7379 Total Submissions: 29099

Given a sorted linked list, delete all duplicates such that each element appear only once. For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, return 1->2->3.   /** * Definition f

Total Accepted: 11381 Total Submissions: 35254 Given an array and a value, remove all instances of that value in place and return the new length. The order of elements can be changed. It doesn't mat

Total Accepted: 11866 Total Submissions: 36548 Find the contiguous subarray within an array (containing at least one number) which has the largest sum. For example, given the array [−2,1,−3,4,−1,2,1