# LeetCode Bulls and Cows

LeetCode Bulls and Cows You are playing the following Bulls and Cows game with your friend: You write down a number and ask your friend to guess what the number is. Each time your friend makes a guess, you provide a hint that indicates how many digits... Read More

# LeetCode Longest Harmonious Subsequence

LeetCode Longest Harmonious Subsequence We define a harmonious array is an array where the difference between its maximum value and its minimum value is exactly 1. Now, given an integer array, you need to find the length of its longest harmonious... Read More

# LeetCode Minimum Index Sum of Two Lists

LeetCode Minimum Index Sum of Two Lists Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite restaurants represented by strings. You need to help them find out their common interest with the least list... Read More

# LeetCode Find Duplicate File in System

LeetCode Find Duplicate File in System Given a list of directory info including directory path, and all the files with contents in this directory, you need to find out all the groups of duplicate files in the file system in terms of their paths. A... Read More

# LeetCode Kill Process

LeetCode Kill Process Given n processes, each process has a unique PID (process id) and its PPID (parent process id). Each process only has one parent process, but may have one or more children processes. This is just like a tree structure. Only one... Read More

# LeetCode Permutation in String

LeetCode Permutation in String Given two strings s1 and s2, write a function to return true if s2 contains the permutation of s1. In other words, one of the first string's permutations is the substring of the second string. Example 1: Input:s1 = "ab"... Read More

# LeetCode Brick Wall

LeetCode Brick Wall There is a brick wall in front of you. The wall is rectangular and has several rows of bricks. The bricks have the same height but different width. You want to draw a vertical line from the top to the bottom and cross the least... Read More

# LeetCode Subarray Sum Equals K

LeetCode Subarray Sum Equals K Given an array of integers and an integer k, you need to find the total number of continuous subarrays whose sum equals to k. Example 1: Input:nums = , k = 2 Output: 2 Note: The length of the array is in range . The... Read More

# LeetCode Can I Win

LeetCode Can I Win In the "100 game," two players take turns adding, to a running total, any integer from 1..10. The player who first causes the running total to reach or exceed 100 wins. What if we change the game so that players cannot re-use... Read More

# LeetCode Distribute Candies

LeetCode Distribute Candies Given an integer array with even length, where different numbers in this array represent different kinds of candies. Each number means one candy of the corresponding kind. You need to distribute these candies equally in... Read More