随笔分类 - LeetCode
摘要：Given a m x n grid. Each cell of the grid has a sign pointing to the next cell you should visit if you are currently in this cell. The sign of grid[i]
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摘要：Given an array A of positive integers, call a (contiguous, not necessarily distinct) subarray of A good if the number of different integers in that su
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摘要：We are given an array A of N lowercase letter strings, all of the same length. Now, we may choose any set of deletion indices, and for each string, we
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摘要：You have some sticks with positive integer lengths. You can connect any two sticks of lengths X and Y into one stick by paying a cost of X + Y. You pe
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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：Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two
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摘要：Median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value. So the median is the mean of the two
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摘要：You are given coins of different denominations and a total amount of money. Write a function to compute the number of combinations that make up that a
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摘要：(This problem is an interactive problem.) On the sea represented by a cartesian plane, each ship is located at an integer point, and each integer poin
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摘要：A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function to count the total strobog
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摘要：A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Find all strobogrammatic numbers that are o
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摘要：You are given a string containing only 4 kinds of characters 'Q', 'W', 'E' and 'R'. A string is said to be balanced if each of its characters appears
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摘要：Given an array nums of positive integers, return the longest possible length of an array prefix of nums, such that it is possible to remove exactly on
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摘要：A die simulator generates a random number from 1 to 6 for each roll. You introduced a constraint to the generator such that it cannot roll the number
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摘要：Your music player contains N different songs and she wants to listen to L (not necessarily different) songs during your trip. You create a playlist so
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摘要：Given the head of a linked list, we repeatedly delete consecutive sequences of nodes that sum to 0 until there are no such sequences. After doing so,
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摘要：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 =
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摘要：In an infinite chess board with coordinates from -infinity to +infinity, you have a knight at square [0, 0]. A knight has 8 possible moves it can make
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摘要：Given an array of integers, return the maximum sum for a non-empty subarray (contiguous elements) with at most one element deletion. In other words, y
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摘要：Given a string s, we make queries on substrings of s. For each query queries[i] = [left, right, k], we may rearrange the substring s[left], ..., s[rig
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