随笔分类 - leetcode
摘要：leetcode-1175-easy Return the number of permutations of 1 to n so that prime numbers are at prime indices (1-indexed.) (Recall that an integer is prim
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摘要：Unique Email Addresses Every valid email consists of a local name and a domain name, separated by the '@' sign. Besides lowercase letters, the email m
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摘要：Rotate String Given two strings s and goal, return true if and only if s can become goal after some number of shifts on s. A shift on s consists of mo
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摘要：Replace Elements with Greatest Element on Right Side Given an array arr, replace every element in that array with the greatest element among the eleme
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摘要：Balanced Binary Tree Given a binary tree, determine if it is height-balanced. Example 1: Input: root = [3,9,20,null,null,15,7] Output: true Example 2:
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摘要：Count Binary Substrings Given a binary string s, return the number of non-empty substrings that have the same number of 0's and 1's, and all the 0's a
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摘要：License Key Formatting You are given a license key represented as a string s that consists of only alphanumeric characters and dashes. The string is s
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摘要：Relative Ranks You are given an integer array score of size n, where score[i] is the score of the ith athlete in a competition. All the scores are gua
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摘要：Lucky Numbers in a Matrix Given an m x n matrix of distinct numbers, return all lucky numbers in the matrix in any order. A lucky number is an element
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摘要：Perfect Number A perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. A divisor of an
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摘要：Minimum Subsequence in No-Increasing Order Given the array nums, obtain a subsequence of the array whose sum of elements is strictly greater than the
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摘要：Fair Candy Swap Alice and Bob have a different total number of candies. You are given two integer arrays aliceSizes and bobSizes where aliceSizes[i] i
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摘要：XOR Operation in an Array You are given an integer n and an integer start. Define an array nums where nums[i] = start + 2 * i (0-indexed) and n == num
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摘要：Number of Valid Words in a Sentence A sentence consists of lowercase letters ('a' to 'z'), digits ('0' to '9'), hyphens ('-'), punctuation marks ('!',
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摘要：Find Target Indices After Sorting Array You are given a 0-indexed integer array nums and a target element target. A target index is an index i such th
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摘要：Thousand Separator Given an integer n, add a dot (".") as the thousands separator and return it in string format. Example 1: Input: n = 987 Output: "9
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摘要：Increasing Decreasing String You are given a string s. Reorder the string using the following algorithm: Pick the smallest character from s and append
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摘要：Binary Number with Alternating Bits Given a positive integer, check whether it has alternating bits: namely, if two adjacent bits will always have dif
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摘要：Most Common Word Given a string paragraph and a string array of the banned words banned, return the most frequent word that is not banned. It is guara
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摘要：Count Equal and Divisible Pairs in an Array Given a 0-indexed integer array nums of length n and an integer k, return the number of pairs (i, j) where
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