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原创 LeetCode 441 Arranging Coins

You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly k coins.Given n, find the total number of full staircase rows that can be formed.

2017-01-13 01:32:44 513 2

原创 LeetCode 37 Sudoku Solver-深搜dfs问题

Write a program to solve a Sudoku puzzle by filling the empty cells.Empty cells are indicated by the character '.'.You may assume that there will be only one unique solution.A sudo

2017-01-09 14:17:46 451

原创 LeetCode 327 Count of Range Sum

Given an integer array nums, return the number of range sums that lie in [lower, upper] inclusive.Range sum S(i, j) is defined as the sum of the elements in nums between indices i and j (i ≤ j),

2016-12-21 16:40:12 524

原创 LeetCode 437 Path Sum III

You are given a binary tree in which each node contains an integer value.Find the number of paths that sum to a given value.The path does not need to start or end at the root or a leaf, but it

2016-12-19 16:57:02 350

原创 LeetCode 454 4Sum II

Given four lists A, B, C, D of integer values, compute how many tuples (i, j, k, l) there are such that A[i] + B[j] + C[k] + D[l] is zero.To make problem a bit easier, all A, B, C, D have same l

2016-12-19 11:35:32 367

原创 LeetCode 174 Dungeon Game-动态规划dp问题

The demons had captured the princess (P) and imprisoned her in the bottom-right corner of a dungeon. The dungeon consists of M x N rooms laid out in a 2D grid. Our valiant knight (K) was initially p

2016-12-16 16:01:13 293

原创 LeetCode 135 Candy

There are N children standing in a line. Each child is assigned a rating value.You are giving candies to these children subjected to the following requirements:Each child must have at least on

2016-12-15 17:12:16 270

原创 LeetCode 138 Copy List with Random Pointer

A linked list is given such that each node contains an additional random pointer which could point to any node in the list or null.Return a deep copy of the list.这题要求深拷贝一个带有random指针的链表ra

2016-12-14 16:02:23 436

原创 LeetCode 149 Max Points on a Line

Given n points on a 2D plane, find the maximum number of points that lie on the same straight line.在一个平面上有n个点，求一条直线最多能够经过多少个这些点。Runtime: 10 ms beats 99.93% of java submissions public in

2016-12-13 21:25:21 254

原创 LeetCode 128 Longest Consecutive Sequence

Given an unsorted array of integers, find the length of the longest consecutive elements sequence.For example,Given [100, 4, 200, 1, 3, 2],The longest consecutive elements sequence is [1, 2, 3

2016-12-13 16:08:38 230

原创 LeetCode 188 Best Time to Buy and Sell Stock IV

Say you have an array for which the ith element is the price of a given stock on day i.Design an algorithm to find the maximum profit. You may complete at most k transactions.Note:You may no

2016-12-12 20:27:12 351

原创 LeetCode 164 Maximum Gap

Given an unsorted array, find the maximum difference between the successive elements in its sorted form.Try to solve it in linear time/space.Return 0 if the array contains less than 2 elements

2016-12-07 17:45:43 312

原创 LeetCode 132 Palindrome Partitioning II

Given a string s, partition s such that every substring of the partition is a palindrome.Return the minimum cuts needed for a palindrome partitioning of s.For example, given s = "aab",Return

2016-12-07 10:04:59 253

原创 LeetCode 131 Palindrome Partitioning

Given a string s, partition s such that every substring of the partition is a palindrome.Return all possible palindrome partitioning of s.For example, given s = "aab",Return[ ["aa","b"],

2016-12-06 22:49:21 257

原创 LeetCode 145 Binary Tree Postorder Traversal

Given a binary tree, return the postorder traversal of its nodes' values.For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3return [3,2,1].Note: Recursive solut

2016-12-06 17:19:55 204

原创 LeetCode 144 Binary Tree Preorder Traversal

Given a binary tree, return the preorder traversal of its nodes' values.For example:Given binary tree {1,#,2,3}, 1 \ 2 / 3return [1,2,3].Note: Recursive soluti

2016-12-06 15:18:43 205

原创 LeetCode 117 Populating Next Right Pointers in Each Node II

Follow up for problem "Populating Next Right Pointers in Each Node".What if the given tree could be any binary tree? Would your previous solution still work?Note:You may only use constant

2016-12-06 11:43:26 237

原创 LeetCode 116 Populating Next Right Pointers in Each Node

Given a binary tree struct TreeLinkNode { TreeLinkNode *left; TreeLinkNode *right; TreeLinkNode *next; }Populate each next pointer to point to its next right node.

2016-12-06 09:41:36 201

原创 LeetCode 126 Word Ladder II

Given two words (beginWord and endWord), and a dictionary's word list, find all shortest transformation sequence(s) from beginWord to endWord, such that:Only one letter can be changed at a timeEac

2016-12-05 21:16:24 262

原创 LeetCode 127 Word Ladder

Given two words (beginWord and endWord), and a dictionary's word list, find the length of shortest transformation sequence from beginWord to endWord, such that:Only one letter can be changed at a

2016-12-04 21:21:20 238

原创 LeetCode 115 Distinct Subsequences

Given a string S and a string T, count the number of distinct subsequences of T in S.A subsequence of a string is a new string which is formed from the original string by deleting some (can be non

2016-12-01 14:56:00 263

原创 LeetCode 68 Text Justification

Given an array of words and a length L, format the text such that each line has exactly L characters and is fully (left and right) justified.You should pack your words in a greedy approach; that i

2016-11-22 23:50:12 225

原创 LeetCode 44 Wildcard Matching

Implement wildcard pattern matching with support for '?' and '*'.'?' Matches any single character.'*' Matches any sequence of characters (including the empty sequence).The matching should cover t

2016-11-14 15:04:04 224

原创 LeetCode 30 Substring with Concatenation of All Words

You are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of substring(s) in s that is a concatenation of each word in words exactly once and

2016-11-12 11:29:14 227

原创 LeetCode 393 UTF-8 Validation

A character in UTF8 can be from 1 to 4 bytes long, subjected to the following rules:For 1-byte character, the first bit is a 0, followed by its unicode code.For n-bytes character, the first n-bits

2016-11-10 09:56:07 521

原创 LeetCode 32 Longest Valid Parentheses

Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring.For "(()", the longest valid parentheses substring is "()",

2016-11-08 10:33:12 203

原创 LeetCode 76 Minimum Window Substring

Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n).For example,S = "ADOBECODEBANC"T = "ABC"Minimum window is "BAN

2016-11-04 18:24:33 214

原创 LeetCode 10 Regular Expression Matching

Implement regular expression matching with support for '.' and '*'.'.' Matches any single character.'*' Matches zero or more of the preceding element.The matching should cover the entire input st

2016-11-03 14:59:30 322

原创 LeetCode 41 First Missing Positive

Given an unsorted integer array, find the first missing positive integer.For example,Given [1,2,0] return 3,and [3,4,-1,1] return 2.Your algorithm should run in O(n) time and uses constant

2016-11-01 21:20:29 169

原创 LeetCode 57 Insert Interval

Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).You may assume that the intervals were initially sorted according to their start times.E

2016-11-01 15:59:36 237

原创 LeetCode 56 Merge Intervals

Given a collection of intervals, merge all overlapping intervals.For example,Given [1,3],[2,6],[8,10],[15,18],return [1,6],[8,10],[15,18]. public List merge(List intervals) { if (interva

2016-10-31 21:58:48 190

原创 LeetCode 25 Reverse Nodes in k-Group

Given a linked list, reverse the nodes of a linked list k at a time and return its modified list.If the number of nodes is not a multiple of k then left-out nodes in the end should remain as it is

2016-10-31 14:29:17 203

原创 LeetCode 87 Scramble String

Given a string s1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively.Below is one possible representation of s1 = "great": great / \ gr

2016-10-31 10:24:13 335

原创 LeetCode 72 Edit Distance

Given two words word1 and word2, find the minimum number of steps required to convert word1 to word2. (each operation is counted as 1 step.)You have the following 3 operations permitted on a word:

2016-10-28 14:01:58 289

原创 LeetCode 42 Trapping Rain Water

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 raining.For example, Given [0,1,0,2,1,0,1,3,2,1,2,1]

2016-10-27 17:11:32 218

原创 LeetCode 84 Largest Rectangle in Histogram

Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.Above is a histogram where width o

2016-10-26 17:33:34 184

原创 LeetCode 85 Maximal Rectangle

Given a 2D binary matrix filled with 0's and 1's, find the largest rectangle containing only 1's and return its area.For example, given the following matrix:1 0 1 0 01 0 1 1 11 1 1 1 11 0 0 1

2016-10-26 11:48:24 225

原创 LeetCode 97 Interleaving String

Given s1, s2, s3, find whether s3 is formed by the interleaving of s1 and s2.For example,Given:s1 = "aabcc",s2 = "dbbca",When s3 = "aadbbcbcac", return true.When s3 = "aadbbbaccc", ret

2016-10-21 14:00:43 390

原创 LeetCode 99 Recover Binary Search Tree

Two elements of a binary search tree (BST) are swapped by mistake.Recover the tree without changing its structure.Note:A solution using O(n) space is pretty straight forward. Could you devis

2016-10-19 20:42:05 221

原创 LeetCode 52 N-Queens II

Follow up for N-Queens problem.Now, instead outputting board configurations, return the total number of distinct solutions.具体解析见http://www.matrix67.com/blog/archives/266 private int su

2016-10-17 10:08:20 182

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