随笔分类 - LeetCode
摘要：Given a non-empty 2D array grid of 0's and 1's, an island is a group of 1's (representing land) connected 4-directionally (horizontal or vertical.) Yo
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摘要：Given a set of keywords words and a string S, make all appearances of all keywords in S bold. Any letters between <b> and </b> tags become bold. The r
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摘要：Given an undirected graph, return true if and only if it is bipartite. Recall that a graph is bipartite if we can split it's set of nodes into two ind
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摘要：An integer interval [a, b] (for integers a < b) is a set of all consecutive integers from a to b, including a and b. Find the minimum size of a set S
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摘要：On an infinite number line (x-axis), we drop given squares in the order they are given. The i-th square dropped (positions[i] = (left, side_length)) i
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摘要：We are stacking blocks to form a pyramid. Each block has a color which is a one letter string, like `'Z'`. For every block of color `C` we place not i
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摘要：We are given N different types of stickers. Each sticker has a lowercase English word on it. You would like to spell out the given target string by cu
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摘要：We are given an elevation map, heights[i] representing the height of the terrain at that index. The width at each index is 1. After V units of water f
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摘要：You are standing at position 0 on an infinite number line. There is a goal at position target. On each move, you can either go left or right. During t
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摘要：In a given array nums of positive integers, find three non-overlapping subarrays with maximum sum. Each subarray will be of size k, and we want to max
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摘要：There is a box protected by a password. The password is n digits, where each letter can be one of the first k digits 0, 1, ..., k-1. You can keep inpu
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摘要：You have a lock in front of you with 4 circular wheels. Each wheel has 10 slots: '0', '1', '2', '3', '4', '5', '6', '7', '8', '9'. The wheels can rota
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摘要：In this problem, a rooted tree is a directed graph such that, there is exactly one node (the root) for which all other nodes are descendants of this n
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摘要：Given a start IP address ip and a number of ips we need to cover n, return a representation of the range as a list (of smallest possible length) of CI
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摘要：Given a grid where each entry is only 0 or 1, find the number of corner rectangles. A corner rectangle is 4 distinct 1s on the grid that form an axis-
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摘要：A virus is spreading rapidly, and your task is to quarantine the infected area by installing walls. The world is modeled as a 2-D array of cells, wher
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摘要：You have N bulbs in a row numbered from 1 to N. Initially, all the bulbs are turned off. We turn on exactly one bulb everyday until all bulbs are on a
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摘要：Find the minimum length word from a given dictionary words, which has all the letters from the string licensePlate. Such a word is said to complete th
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摘要：You have 4 cards each containing a number from 1 to 9. You need to judge whether they could operated through *, /, +, -, (, )to get the value of 24. E
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摘要：In a given integer array nums, there is always exactly one largest element. Find whether the largest element in the array is at least twice as much as
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