随笔分类 - LeetCode
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
阅读全文
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
阅读全文
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
阅读全文
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
阅读全文
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
阅读全文
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
阅读全文
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
阅读全文
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
阅读全文
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
阅读全文
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-
阅读全文
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
阅读全文
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
阅读全文
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
阅读全文
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
阅读全文
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
阅读全文
摘要：You are asked to cut off trees in a forest for a golf event. The forest is represented as a non-negative 2D map, in this map: 0 represents the obstacl
阅读全文
摘要：Nearly everyone has used the Multiplication Table. The multiplication table of size m x n is an integer matrix mat where mat[i][j] == i * j (1-indexed
阅读全文
摘要：On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). Once you pay the cost, you can either climb one or two steps. Y
阅读全文
摘要：Given many words, words[i] has weight i. Design a class WordFilter that supports one function, WordFilter.f(String prefix, String suffix). It will ret
阅读全文
摘要：There is a strange printer with the following two special requirements: The printer can only print a sequence of the same character each time. At each
阅读全文
