随笔分类 - Level 2
摘要：Construct minimum number by reordering a given non-negative integer array. Arrange them such that they form the minimum number. Notice The result may
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摘要：According to the Wikipedia's article: "The Game of Life, also known simply as Life, is a cellular automaton devised by the British mathematician John
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摘要：Given two strings S and T, determine if they are both one edit distance apart. 分析：https://segmentfault.com/a/1190000003906621 虽然我们可以用Edit Distance的解法，
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摘要：Given an Iterator class interface with methods: next() and hasNext(), design and implement a PeekingIterator that support the peek()operation -- it es
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摘要：Given two 1d vectors, implement an iterator to return their elements alternately. For example, given two 1d vectors: By calling next repeatedly until
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摘要：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 shou
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摘要：H-Index I Given an array of citations (each citation is a non-negative integer) of a researcher, write a function to compute the researcher's h-index.
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摘要：Given a string S, you are allowed to convert it to a palindrome by adding characters in front of it. Find and return the shortest palindrome you can f
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摘要：Implement an iterator to flatten a 2d vector. For example, Given 2d vector = By calling next repeatedly until hasNext returns false, the order of elem
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摘要：Verify Preorder Sequence in Binary Search Tree \Given an array of numbers, verify whether it is the correct preorder traversal sequence of a binary se
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摘要：A group of two or more people wants to meet and minimize the total travel distance. You are given a 2D grid of values 0 or 1, where each 1 marks the h
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摘要：Given a binary tree, find the length of the longest consecutive sequence path （连续的路径，不是从小到大）. The path refers to any sequence of nodes from some start
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摘要：Additive number is a string whose digits can form additive sequence. A valid additive sequence should contain at least three numbers. Except for the f
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摘要：Given a binary tree, return the vertical order traversal of its nodes' values. (ie, from top to bottom, column by column). If two nodes are in the sam
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摘要：Given a string array words, find the maximum value of length(word[i]) * length(word[j]) where the two words do not share common letters. You may assum
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摘要：Given a range [m, n] where 0 <= m <= n <= 2147483647, return the bitwise AND of all numbers in this range, inclusive. For example, given the range [5,
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摘要：Given a binary tree, imagine yourself standing on the right side of it, return the values of the nodes you can see ordered from top to bottom. For exa
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摘要：Given a string, find the longest substring that contains only two unique characters. For example, given "abcbbbbcccbdddadacb", the longest substring t
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摘要：There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle every
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摘要：Given a set of distinct positive integers, find the largest subset such that every pair (Si, Sj) of elements in this subset satisfies: Si % Sj = 0 or
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