哈希·表·结合·string模式

同构字符串

Determine if two strings are isomorphic by checking if one string can be transformed into the other using character repl…

实现 Trie (前缀树)

This problem requires designing a Trie (Prefix Tree) to efficiently store and query strings using hash table concepts fo…

有效的字母异位词

Check if two strings are anagrams using hashing or sorting techniques.

单词规律

Solve Word Pattern by checking a one-to-one mapping between pattern letters and words using hash tables after splitting …

猜数字游戏

Solve the Bulls and Cows problem using hash tables and string manipulation to track exact and misplaced digits.

赎金信

Determine if a ransom note can be constructed from a magazine's letters using hash tables and string counting techniques…

找不同

Find the Difference involves identifying the additional letter in one string compared to another, emphasizing hash table…

TinyURL 的加密与解密

Design a class that encodes and decodes URLs using a URL shortening approach based on hash tables and strings.

键值映射

Design and implement a data structure that supports efficient insertion and sum queries based on string prefixes.

宝石与石头

Given two strings, determine how many of the stones you have are also jewels, considering case sensitivity.

自定义字符串排序

Sort the string `s` according to a custom order defined by string `order`.

亲密字符串

Determine if two strings can become equal by swapping exactly two letters using a hash table for character tracking.

两句话中的不常见单词

Find uncommon words from two sentences by counting word frequencies using hash tables.

字母板上的路径

Find the path to type a target string on an alphabet board using directional moves and the 'hash table plus string' patt…

“气球” 的最大数量

Find the maximum number of times the word 'balloon' can be formed from characters of the given string.

制造字母异位词的最小步骤数

Calculate the minimum steps to transform one string into an anagram of another using character replacements efficiently.

上升下降字符串

Reorder the string based on a specific algorithm using hash tables and string manipulation.

设计地铁系统

Design an underground system to calculate travel times between stations using hash tables for efficient lookups and aver…

HTML 实体解析器

Transform a string containing HTML entities into their character equivalents using a hash table for efficient parsing.

检查一个字符串是否包含所有长度为 K 的二进制子串

Determine if every possible binary string of length k exists as a substring within a given binary string s efficiently u…

判断路径是否相交

Check if a path crosses itself on a 2D plane using a hash table to track visited points during traversal.

K 次操作转变字符串

Determine if string s can be transformed into t within k moves using character shifts and hash table counting efficientl…

找出最长的超赞子字符串

Find the maximum-length awesome substring in a numeric string using hash table and bit manipulation for palindrome poten…

两个相同字符之间的最长子字符串

Find the longest substring between two equal characters using a hash table for optimized performance.