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Category Archives: Array and linked list
Median of Two Sorted Arrays
There are two sorted arrays A and B of size m and n respectively. Find the median of the two sorted arrays. The overall run time complexity should be O(log (m+n)). C++: 01 double kSmall(int A[],int m,int B[],int n,int k) 02 { … Continue reading
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Longest Palindromic Substring
Given a string S, find the longest palindromic substring in S. You may assume that the maximum length of S is 1000, and there exists one unique longest palindromic substring. C++: 01 class Solution { 02 public: 03 string longestPalindrome(string s) { 04 … Continue reading
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ZigZag Conversion
The string “PAYPALISHIRING” is written in a zigzag pattern on a given number of rows like this: (you may want to display this pattern in a fixed font for better legibility) P A H N A P L S I I G … Continue reading
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Container With Most Water
Given n non-negative integers a1, a2, …, an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Find two lines, which together with x-axis forms a container, such that the container … Continue reading
Posted in Array and linked list, Greedy algorithm
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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 unique quadruplets in the array which gives the sum of target. Note: Elements in a quadruplet (a,b,c,d) must be in non-descending order. (ie, a ? b ? c ? d) The solution set must not contain … Continue reading
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3Sum Closest
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 integers. You may assume that each input would have exactly one solution. For example, given array S … Continue reading
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3Sum
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 sum of zero. Note: Elements in a triplet (a,b,c) must be in non-descending order. (ie, a ? b ? c) The solution set must not contain duplicate … Continue reading
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Substring with Concatenation of All Words
You are given a string, S, and a list of words, L, that are all of the same length. Find all starting indices of substring(s) in S that is a concatenation of each word in L exactly once and without any intervening … Continue reading
Posted in Array and linked list, Hashtable and Map, String
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Longest Common Prefix
Write a function to find the longest common prefix string among an array of strings. C++: 01 class Solution { 02 public: 03 string longestCommonPrefix(vector<string> &strs) { 04 // Start typing your C/C++ solution below 05 … Continue reading
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Longest Substring Without Repeating Characters
Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for “abcabcbb” is “abc”, which the length is 3. For “bbbbb” the longest substring is “b”, with the length … Continue reading
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