06 2021 档案
摘要:A new online video game has been released, and in this video game, there are 15-minute rounds scheduled every quarter-hour period. This means that at
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摘要:On an N x N grid, each square grid[i][j] represents the elevation at that point (i,j). Now rain starts to fall. At time t, the depth of the water ever
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摘要:You are given an array colors, in which there are three colors: 1, 2 and 3. You are also given some queries. Each query consists of two integers i and
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摘要:You are given an array of strings arr. A string s is formed by the concatenation of a subsequence of arr that has unique characters. Return the maximu
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摘要:You have n packages that you are trying to place in boxes, one package in each box. There are m suppliers that each produce boxes of different sizes (
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摘要:Given an integer array nums, your goal is to make all elements in nums equal. To complete one operation, follow these steps: Find the largest value in
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摘要:Given two n x n binary matrices mat and target, return true if it is possible to make mat equal to target by rotating mat in 90-degree increments, or
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摘要:A triplet is an array of three integers. You are given a 2D integer array triplets, where triplets[i] = [ai, bi, ci] describes the ith triplet. You ar
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摘要:You are given two strings s and p where p is a subsequence of s. You are also given a distinct 0-indexed integer array removable containing a subset o
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摘要:You are given an array of strings words (0-indexed). In one operation, pick two distinct indices i and j, where words[i] is a non-empty string, and mo
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摘要:Given a string s and an integer k, return true if you can use all the characters in s to construct k palindrome strings or false otherwise. Example 1:
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摘要:The pair sum of a pair (a,b) is equal to a + b. The maximum pair sum is the largest pair sum in a list of pairs. For example, if we have pairs (1,5),
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摘要:You are given an integer array nums and an integer target. You want to build an expression out of nums by adding one of the symbols '+' and '-' before
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摘要:Given the roots of two binary search trees, root1 and root2, return true if and only if there is a node in the first tree and a node in the second tre
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摘要:Given an array of integers arr, replace each element with its rank. The rank represents how large the element is. The rank has the following rules: Ra
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摘要:Given a binary tree, return the sum of values of nodes with even-valued grandparent. (A grandparent of a node is the parent of its parent, if it exist
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摘要:Given an array of integers arr, sort the array by performing a series of pancake flips. In one pancake flip we do the following steps: Choose an integ
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