## 哈希表

| \# | 题名 | 题解 | 通过率 | 难度 | 出现频率   |
|------|----------------------|-----|--------|----|--------|
|1|[两数之和](https://leetcode-cn.com/problems/two-sum)   |[811](https://leetcode-cn.com/problems/two-sum/solution)|47.2%|简单|86.38%|
|149|[直线上最多的点数](https://leetcode-cn.com/problems/max-points-on-a-line)   |[32](https://leetcode-cn.com/problems/max-points-on-a-line/solution)|19.6%|困难|83.26%|
|85|[最大矩形](https://leetcode-cn.com/problems/maximal-rectangle)   |[37](https://leetcode-cn.com/problems/maximal-rectangle/solution)|43.4%|困难|72.99%|
|3|[无重复字符的最长子串](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters)   |[626](https://leetcode-cn.com/problems/longest-substring-without-repeating-characters/solution)|32.3%|中等|72.41%|
|1044|[最长重复子串](https://leetcode-cn.com/problems/longest-duplicate-substring)   |[12](https://leetcode-cn.com/problems/longest-duplicate-substring/solution)|14.6%|困难|65.73%|
|711|[不同岛屿的数量 II](https://leetcode-cn.com/problems/number-of-distinct-islands-ii)   |[6](https://leetcode-cn.com/problems/number-of-distinct-islands-ii/solution)|52.6%|困难|60.23%|
|535|[TinyURL 的加密与解密](https://leetcode-cn.com/problems/encode-and-decode-tinyurl)   |[14](https://leetcode-cn.com/problems/encode-and-decode-tinyurl/solution)|80.7%|中等|55.44%|
|37|[解数独](https://leetcode-cn.com/problems/sudoku-solver)   |[63](https://leetcode-cn.com/problems/sudoku-solver/solution)|58.4%|困难|52.79%|
|726|[原子的数量](https://leetcode-cn.com/problems/number-of-atoms)   |[12](https://leetcode-cn.com/problems/number-of-atoms/solution)|42.8%|困难|52.34%|
|632|[最小区间](https://leetcode-cn.com/problems/smallest-range-covering-elements-from-k-lists)   |[19](https://leetcode-cn.com/problems/smallest-range-covering-elements-from-k-lists/solution)|33.5%|困难|52.34%|
|76|[最小覆盖子串](https://leetcode-cn.com/problems/minimum-window-substring)   |[47](https://leetcode-cn.com/problems/minimum-window-substring/solution)|34.8%|困难|51.25%|
|718|[最长重复子数组](https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray)   |[25](https://leetcode-cn.com/problems/maximum-length-of-repeated-subarray/solution)|47.7%|中等|48.76%|
|381|[O(1) 时间插入、删除和获取随机元素 - 允许重复](https://leetcode-cn.com/problems/insert-delete-getrandom-o1-duplicates-allowed)   |[12](https://leetcode-cn.com/problems/insert-delete-getrandom-o1-duplicates-allowed/solution)|36.6%|困难|47.14%|
|974|[和可被 K 整除的子数组](https://leetcode-cn.com/problems/subarray-sums-divisible-by-k)   |[10](https://leetcode-cn.com/problems/subarray-sums-divisible-by-k/solution)|36.1%|中等|44.89%|
|939|[最小面积矩形](https://leetcode-cn.com/problems/minimum-area-rectangle)   |[9](https://leetcode-cn.com/problems/minimum-area-rectangle/solution)|42.4%|中等|44.36%|
|676|[实现一个魔法字典](https://leetcode-cn.com/problems/implement-magic-dictionary)   |[10](https://leetcode-cn.com/problems/implement-magic-dictionary/solution)|53.9%|中等|44.27%|
|1166|[设计文件系统](https://leetcode-cn.com/problems/design-file-system)   |[5](https://leetcode-cn.com/problems/design-file-system/solution)|48.1%|中等|44.08%|
|202|[快乐数](https://leetcode-cn.com/problems/happy-number)   |[105](https://leetcode-cn.com/problems/happy-number/solution)|56.3%|简单|43.95%|
|560|[和为K的子数组](https://leetcode-cn.com/problems/subarray-sum-equals-k)   |[29](https://leetcode-cn.com/problems/subarray-sum-equals-k/solution)|42.6%|中等|43.62%|
|94|[二叉树的中序遍历](https://leetcode-cn.com/problems/binary-tree-inorder-traversal)   |[135](https://leetcode-cn.com/problems/binary-tree-inorder-traversal/solution)|69.3%|中等|42.86%|
|554|[砖墙](https://leetcode-cn.com/problems/brick-wall)   |[26](https://leetcode-cn.com/problems/brick-wall/solution)|34.8%|中等|42.84%|
|204|[计数质数](https://leetcode-cn.com/problems/count-primes)   |[45](https://leetcode-cn.com/problems/count-primes/solution)|31.4%|简单|41.9%|
|138|[复制带随机指针的链表](https://leetcode-cn.com/problems/copy-list-with-random-pointer)   |[42](https://leetcode-cn.com/problems/copy-list-with-random-pointer/solution)|41.1%|中等|41.81%|
|336|[回文对](https://leetcode-cn.com/problems/palindrome-pairs)   |[7](https://leetcode-cn.com/problems/palindrome-pairs/solution)|32.3%|困难|41.42%|
|1048|[最长字符串链](https://leetcode-cn.com/problems/longest-string-chain)   |[15](https://leetcode-cn.com/problems/longest-string-chain/solution)|37.9%|中等|41.3%|
|30|[串联所有单词的子串](https://leetcode-cn.com/problems/substring-with-concatenation-of-all-words)   |[59](https://leetcode-cn.com/problems/substring-with-concatenation-of-all-words/solution)|28.4%|困难|38.5%|
|325|[和等于 k 的最长子数组长度](https://leetcode-cn.com/problems/maximum-size-subarray-sum-equals-k)   |[12](https://leetcode-cn.com/problems/maximum-size-subarray-sum-equals-k/solution)|44.7%|中等|38.11%|
|992|[K 个不同整数的子数组](https://leetcode-cn.com/problems/subarrays-with-k-different-integers)   |[15](https://leetcode-cn.com/problems/subarrays-with-k-different-integers/solution)|23.6%|困难|37.17%|
|463|[岛屿的周长](https://leetcode-cn.com/problems/island-perimeter)   |[55](https://leetcode-cn.com/problems/island-perimeter/solution)|64.1%|简单|36.46%|
|594|[最长和谐子序列](https://leetcode-cn.com/problems/longest-harmonious-subsequence)   |[27](https://leetcode-cn.com/problems/longest-harmonious-subsequence/solution)|44.0%|简单|35.43%|
|739|[每日温度](https://leetcode-cn.com/problems/daily-temperatures)   |[85](https://leetcode-cn.com/problems/daily-temperatures/solution)|56.6%|中等|35.18%|
|18|[四数之和](https://leetcode-cn.com/problems/4sum)   |[155](https://leetcode-cn.com/problems/4sum/solution)|36.4%|中等|34.83%|
|355|[设计推特](https://leetcode-cn.com/problems/design-twitter)   |[18](https://leetcode-cn.com/problems/design-twitter/solution)|36.6%|中等|32.83%|
|347|[前 K 个高频元素](https://leetcode-cn.com/problems/top-k-frequent-elements)   |[87](https://leetcode-cn.com/problems/top-k-frequent-elements/solution)|59.2%|中等|32.58%|
|648|[单词替换](https://leetcode-cn.com/problems/replace-words)   |[20](https://leetcode-cn.com/problems/replace-words/solution)|53.0%|中等|31.67%|
|187|[重复的DNA序列](https://leetcode-cn.com/problems/repeated-dna-sequences)   |[25](https://leetcode-cn.com/problems/repeated-dna-sequences/solution)|43.1%|中等|31.43%|
|136|[只出现一次的数字](https://leetcode-cn.com/problems/single-number)   |[191](https://leetcode-cn.com/problems/single-number/solution)|64.5%|简单|31.17%|
|710|[黑名单中的随机数](https://leetcode-cn.com/problems/random-pick-with-blacklist)   |[3](https://leetcode-cn.com/problems/random-pick-with-blacklist/solution)|27.3%|困难|30.43%|
|525|[连续数组](https://leetcode-cn.com/problems/contiguous-array)   |[6](https://leetcode-cn.com/problems/contiguous-array/solution)|39.9%|中等|30.43%|
|314|[二叉树的垂直遍历](https://leetcode-cn.com/problems/binary-tree-vertical-order-traversal)   |[15](https://leetcode-cn.com/problems/binary-tree-vertical-order-traversal/solution)|53.7%|中等|28.97%|
|781|[森林中的兔子](https://leetcode-cn.com/problems/rabbits-in-forest)   |[27](https://leetcode-cn.com/problems/rabbits-in-forest/solution)|52.9%|中等|26.94%|
|454|[四数相加 II](https://leetcode-cn.com/problems/4sum-ii)   |[32](https://leetcode-cn.com/problems/4sum-ii/solution)|53.7%|中等|25.74%|
|981|[基于时间的键值存储](https://leetcode-cn.com/problems/time-based-key-value-store)   |[13](https://leetcode-cn.com/problems/time-based-key-value-store/solution)|33.1%|中等|25.71%|
|1224|[最大相等频率](https://leetcode-cn.com/problems/maximum-equal-frequency)   |[14](https://leetcode-cn.com/problems/maximum-equal-frequency/solution)|26.4%|困难|25.07%|
|359|[日志速率限制器](https://leetcode-cn.com/problems/logger-rate-limiter)   |[7](https://leetcode-cn.com/problems/logger-rate-limiter/solution)|66.9%|简单|24.35%|
|350|[两个数组的交集 II](https://leetcode-cn.com/problems/intersection-of-two-arrays-ii)   |[119](https://leetcode-cn.com/problems/intersection-of-two-arrays-ii/solution)|45.6%|简单|23.36%|
|36|[有效的数独](https://leetcode-cn.com/problems/valid-sudoku)   |[94](https://leetcode-cn.com/problems/valid-sudoku/solution)|57.5%|中等|22.67%|
|771|[宝石与石头](https://leetcode-cn.com/problems/jewels-and-stones)   |[181](https://leetcode-cn.com/problems/jewels-and-stones/solution)|81.2%|简单|22.5%|
|387|[字符串中的第一个唯一字符](https://leetcode-cn.com/problems/first-unique-character-in-a-string)   |[104](https://leetcode-cn.com/problems/first-unique-character-in-a-string/solution)|42.2%|简单|22.04%|
|930|[和相同的二元子数组](https://leetcode-cn.com/problems/binary-subarrays-with-sum)   |[9](https://leetcode-cn.com/problems/binary-subarrays-with-sum/solution)|33.9%|中等|21.9%|
|694|[不同岛屿的数量](https://leetcode-cn.com/problems/number-of-distinct-islands)   |[16](https://leetcode-cn.com/problems/number-of-distinct-islands/solution)|42.2%|中等|21.52%|
|447|[回旋镖的数量](https://leetcode-cn.com/problems/number-of-boomerangs)   |[19](https://leetcode-cn.com/problems/number-of-boomerangs/solution)|55.9%|简单|21.4%|
|49|[字母异位词分组](https://leetcode-cn.com/problems/group-anagrams)   |[79](https://leetcode-cn.com/problems/group-anagrams/solution)|59.7%|中等|21.38%|
|705|[设计哈希集合](https://leetcode-cn.com/problems/design-hashset)   |[35](https://leetcode-cn.com/problems/design-hashset/solution)|54.5%|简单|20.77%|
|451|[根据字符出现频率排序](https://leetcode-cn.com/problems/sort-characters-by-frequency)   |[53](https://leetcode-cn.com/problems/sort-characters-by-frequency/solution)|60.7%|中等|20.64%|
|953|[验证外星语词典](https://leetcode-cn.com/problems/verifying-an-alien-dictionary)   |[25](https://leetcode-cn.com/problems/verifying-an-alien-dictionary/solution)|56.3%|简单|20.34%|
|884|[两句话中的不常见单词](https://leetcode-cn.com/problems/uncommon-words-from-two-sentences)   |[38](https://leetcode-cn.com/problems/uncommon-words-from-two-sentences/solution)|59.7%|简单|20.34%|
|349|[两个数组的交集](https://leetcode-cn.com/problems/intersection-of-two-arrays)   |[107](https://leetcode-cn.com/problems/intersection-of-two-arrays/solution)|67.4%|简单|20.23%|
|340|[至多包含 K 个不同字符的最长子串](https://leetcode-cn.com/problems/longest-substring-with-at-most-k-distinct-characters)   |[15](https://leetcode-cn.com/problems/longest-substring-with-at-most-k-distinct-characters/solution)|45.1%|困难|20.02%|
|166|[分数到小数](https://leetcode-cn.com/problems/fraction-to-recurring-decimal)   |[33](https://leetcode-cn.com/problems/fraction-to-recurring-decimal/solution)|25.2%|中等|19.75%|
|244|[最短单词距离 II](https://leetcode-cn.com/problems/shortest-word-distance-ii)   |[8](https://leetcode-cn.com/problems/shortest-word-distance-ii/solution)|46.0%|中等|19.6%|
|159|[至多包含两个不同字符的最长子串](https://leetcode-cn.com/problems/longest-substring-with-at-most-two-distinct-characters)   |[16](https://leetcode-cn.com/problems/longest-substring-with-at-most-two-distinct-characters/solution)|52.1%|中等|19.6%|
|290|[单词规律](https://leetcode-cn.com/problems/word-pattern)   |[82](https://leetcode-cn.com/problems/word-pattern/solution)|41.4%|简单|19.54%|
|1207|[独一无二的出现次数](https://leetcode-cn.com/problems/unique-number-of-occurrences)   |[85](https://leetcode-cn.com/problems/unique-number-of-occurrences/solution)|67.1%|简单|19.24%|
|690|[员工的重要性](https://leetcode-cn.com/problems/employee-importance)   |[25](https://leetcode-cn.com/problems/employee-importance/solution)|55.4%|简单|18.9%|
|205|[同构字符串](https://leetcode-cn.com/problems/isomorphic-strings)   |[74](https://leetcode-cn.com/problems/isomorphic-strings/solution)|46.8%|简单|18.23%|
|575|[分糖果](https://leetcode-cn.com/problems/distribute-candies)   |[52](https://leetcode-cn.com/problems/distribute-candies/solution)|64.5%|简单|18.15%|
|1086|[前五科的均分](https://leetcode-cn.com/problems/high-five)   |[12](https://leetcode-cn.com/problems/high-five/solution)|67.0%|简单|17.82%|
|1160|[拼写单词](https://leetcode-cn.com/problems/find-words-that-can-be-formed-by-characters)   |[62](https://leetcode-cn.com/problems/find-words-that-can-be-formed-by-characters/solution)|63.6%|简单|17.35%|
|706|[设计哈希映射](https://leetcode-cn.com/problems/design-hashmap)   |[29](https://leetcode-cn.com/problems/design-hashmap/solution)|55.9%|简单|17.22%|
|274|[H指数](https://leetcode-cn.com/problems/h-index)   |[23](https://leetcode-cn.com/problems/h-index/solution)|37.0%|中等|17.2%|
|409|[最长回文串](https://leetcode-cn.com/problems/longest-palindrome)   |[53](https://leetcode-cn.com/problems/longest-palindrome/solution)|51.1%|简单|17.12%|
|692|[前K个高频单词](https://leetcode-cn.com/problems/top-k-frequent-words)   |[24](https://leetcode-cn.com/problems/top-k-frequent-words/solution)|46.8%|中等|16.96%|
|500|[键盘行](https://leetcode-cn.com/problems/keyboard-row)   |[91](https://leetcode-cn.com/problems/keyboard-row/solution)|67.9%|简单|16.73%|
|380|[常数时间插入、删除和获取随机元素](https://leetcode-cn.com/problems/insert-delete-getrandom-o1)   |[26](https://leetcode-cn.com/problems/insert-delete-getrandom-o1/solution)|47.3%|中等|16.69%|
|961|[重复 N 次的元素](https://leetcode-cn.com/problems/n-repeated-element-in-size-2n-array)   |[66](https://leetcode-cn.com/problems/n-repeated-element-in-size-2n-array/solution)|66.0%|简单|16.21%|
|242|[有效的字母异位词](https://leetcode-cn.com/problems/valid-anagram)   |[114](https://leetcode-cn.com/problems/valid-anagram/solution)|57.5%|简单|15.55%|
|438|[找到字符串中所有字母异位词](https://leetcode-cn.com/problems/find-all-anagrams-in-a-string)   |[40](https://leetcode-cn.com/problems/find-all-anagrams-in-a-string/solution)|39.7%|中等|15.17%|
|217|[存在重复元素](https://leetcode-cn.com/problems/contains-duplicate)   |[116](https://leetcode-cn.com/problems/contains-duplicate/solution)|51.1%|简单|14.72%|
|508|[出现次数最多的子树元素和](https://leetcode-cn.com/problems/most-frequent-subtree-sum)   |[17](https://leetcode-cn.com/problems/most-frequent-subtree-sum/solution)|59.7%|中等|13.68%|
|957|[N 天后的牢房](https://leetcode-cn.com/problems/prison-cells-after-n-days)   |[22](https://leetcode-cn.com/problems/prison-cells-after-n-days/solution)|32.5%|中等|13.53%|
|299|[猜数字游戏](https://leetcode-cn.com/problems/bulls-and-cows)   |[38](https://leetcode-cn.com/problems/bulls-and-cows/solution)|45.6%|简单|12.22%|
|1002|[查找常用字符](https://leetcode-cn.com/problems/find-common-characters)   |[47](https://leetcode-cn.com/problems/find-common-characters/solution)|65.5%|简单|11.29%|
|811|[子域名访问计数](https://leetcode-cn.com/problems/subdomain-visit-count)   |[45](https://leetcode-cn.com/problems/subdomain-visit-count/solution)|65.7%|简单|10.18%|
|1189|[“气球” 的最大数量](https://leetcode-cn.com/problems/maximum-number-of-balloons)   |[60](https://leetcode-cn.com/problems/maximum-number-of-balloons/solution)|61.8%|简单|9.46%|
|645|[错误的集合](https://leetcode-cn.com/problems/set-mismatch)   |[31](https://leetcode-cn.com/problems/set-mismatch/solution)|39.5%|简单|7.28%|
|389|[找不同](https://leetcode-cn.com/problems/find-the-difference)   |[85](https://leetcode-cn.com/problems/find-the-difference/solution)|60.2%|简单|6.72%|
|219|[存在重复元素 II](https://leetcode-cn.com/problems/contains-duplicate-ii)   |[88](https://leetcode-cn.com/problems/contains-duplicate-ii/solution)|36.8%|简单|6.01%|
|1261|[在受污染的二叉树中查找元素](https://leetcode-cn.com/problems/find-elements-in-a-contaminated-binary-tree)   |[21](https://leetcode-cn.com/problems/find-elements-in-a-contaminated-binary-tree/solution)|69.3%|中等|&nbsp;|
|1178|[猜字谜](https://leetcode-cn.com/problems/number-of-valid-words-for-each-puzzle)   |[10](https://leetcode-cn.com/problems/number-of-valid-words-for-each-puzzle/solution)|24.8%|困难|&nbsp;|
|1138|[字母板上的路径](https://leetcode-cn.com/problems/alphabet-board-path)   |[29](https://leetcode-cn.com/problems/alphabet-board-path/solution)|36.7%|中等|&nbsp;|
|1244|[力扣排行榜](https://leetcode-cn.com/problems/design-a-leaderboard)   |[8](https://leetcode-cn.com/problems/design-a-leaderboard/solution)|49.8%|中等|&nbsp;|
|1090|[受标签影响的最大值](https://leetcode-cn.com/problems/largest-values-from-labels)   |[8](https://leetcode-cn.com/problems/largest-values-from-labels/solution)|46.3%|中等|&nbsp;|
|1078|[Bigram 分词](https://leetcode-cn.com/problems/occurrences-after-bigram)   |[36](https://leetcode-cn.com/problems/occurrences-after-bigram/solution)|59.4%|简单|&nbsp;|
|1213|[三个有序数组的交集](https://leetcode-cn.com/problems/intersection-of-three-sorted-arrays)   |[18](https://leetcode-cn.com/problems/intersection-of-three-sorted-arrays/solution)|74.7%|简单|&nbsp;|
|1072|[按列翻转得到最大值等行数](https://leetcode-cn.com/problems/flip-columns-for-maximum-number-of-equal-rows)   |[8](https://leetcode-cn.com/problems/flip-columns-for-maximum-number-of-equal-rows/solution)|45.1%|中等|&nbsp;|
|1198|[找出所有行中最小公共元素](https://leetcode-cn.com/problems/find-smallest-common-element-in-all-rows)   |[8](https://leetcode-cn.com/problems/find-smallest-common-element-in-all-rows/solution)|70.6%|中等|&nbsp;|
|1152|[用户网站访问行为分析](https://leetcode-cn.com/problems/analyze-user-website-visit-pattern)   |[6](https://leetcode-cn.com/problems/analyze-user-website-visit-pattern/solution)|28.4%|中等|&nbsp;|
|1133|[最大唯一数](https://leetcode-cn.com/problems/largest-unique-number)   |[11](https://leetcode-cn.com/problems/largest-unique-number/solution)|58.9%|简单|&nbsp;|
|1001|[网格照明](https://leetcode-cn.com/problems/grid-illumination)   |[11](https://leetcode-cn.com/problems/grid-illumination/solution)|27.2%|困难|&nbsp;|
|987|[二叉树的垂序遍历](https://leetcode-cn.com/problems/vertical-order-traversal-of-a-binary-tree)   |[22](https://leetcode-cn.com/problems/vertical-order-traversal-of-a-binary-tree/solution)|36.8%|中等|&nbsp;|
|970|[强整数](https://leetcode-cn.com/problems/powerful-integers)   |[22](https://leetcode-cn.com/problems/powerful-integers/solution)|38.4%|简单|&nbsp;|
|966|[元音拼写检查器](https://leetcode-cn.com/problems/vowel-spellchecker)   |[8](https://leetcode-cn.com/problems/vowel-spellchecker/solution)|35.9%|中等|&nbsp;|
|954|[二倍数对数组](https://leetcode-cn.com/problems/array-of-doubled-pairs)   |[10](https://leetcode-cn.com/problems/array-of-doubled-pairs/solution)|25.5%|中等|&nbsp;|
|895|[最大频率栈](https://leetcode-cn.com/problems/maximum-frequency-stack)   |[2](https://leetcode-cn.com/problems/maximum-frequency-stack/solution)|45.2%|困难|&nbsp;|
|770|[基本计算器 IV](https://leetcode-cn.com/problems/basic-calculator-iv)   |[4](https://leetcode-cn.com/problems/basic-calculator-iv/solution)|47.3%|困难|&nbsp;|
|760|[找出变位映射](https://leetcode-cn.com/problems/find-anagram-mappings)   |[22](https://leetcode-cn.com/problems/find-anagram-mappings/solution)|78.3%|简单|&nbsp;|
|748|[最短完整词](https://leetcode-cn.com/problems/shortest-completing-word)   |[22](https://leetcode-cn.com/problems/shortest-completing-word/solution)|56.1%|简单|&nbsp;|
|734|[句子相似性](https://leetcode-cn.com/problems/sentence-similarity)   |[5](https://leetcode-cn.com/problems/sentence-similarity/solution)|48.4%|简单|&nbsp;|
|720|[词典中最长的单词](https://leetcode-cn.com/problems/longest-word-in-dictionary)   |[26](https://leetcode-cn.com/problems/longest-word-in-dictionary/solution)|44.2%|简单|&nbsp;|
|624|[数组列表中的最大距离](https://leetcode-cn.com/problems/maximum-distance-in-arrays)   |[12](https://leetcode-cn.com/problems/maximum-distance-in-arrays/solution)|38.8%|简单|&nbsp;|
|609|[在系统中查找重复文件](https://leetcode-cn.com/problems/find-duplicate-file-in-system)   |[9](https://leetcode-cn.com/problems/find-duplicate-file-in-system/solution)|54.0%|中等|&nbsp;|
|599|[两个列表的最小索引总和](https://leetcode-cn.com/problems/minimum-index-sum-of-two-lists)   |[34](https://leetcode-cn.com/problems/minimum-index-sum-of-two-lists/solution)|49.2%|简单|&nbsp;|
|358|[K 距离间隔重排字符串](https://leetcode-cn.com/problems/rearrange-string-k-distance-apart)   |[6](https://leetcode-cn.com/problems/rearrange-string-k-distance-apart/solution)|35.2%|困难|&nbsp;|
|356|[直线镜像](https://leetcode-cn.com/problems/line-reflection)   |[7](https://leetcode-cn.com/problems/line-reflection/solution)|27.1%|中等|&nbsp;|
|311|[稀疏矩阵的乘法](https://leetcode-cn.com/problems/sparse-matrix-multiplication)   |[9](https://leetcode-cn.com/problems/sparse-matrix-multiplication/solution)|73.0%|中等|&nbsp;|
|288|[单词的唯一缩写](https://leetcode-cn.com/problems/unique-word-abbreviation)   |[6](https://leetcode-cn.com/problems/unique-word-abbreviation/solution)|28.9%|中等|&nbsp;|
|266|[回文排列](https://leetcode-cn.com/problems/palindrome-permutation)   |[15](https://leetcode-cn.com/problems/palindrome-permutation/solution)|59.5%|简单|&nbsp;|
|249|[移位字符串分组](https://leetcode-cn.com/problems/group-shifted-strings)   |[17](https://leetcode-cn.com/problems/group-shifted-strings/solution)|58.5%|中等|&nbsp;|
|246|[中心对称数](https://leetcode-cn.com/problems/strobogrammatic-number)   |[11](https://leetcode-cn.com/problems/strobogrammatic-number/solution)|44.8%|简单|&nbsp;|
|170|[两数之和 III - 数据结构设计](https://leetcode-cn.com/problems/two-sum-iii-data-structure-design)   |[9](https://leetcode-cn.com/problems/two-sum-iii-data-structure-design/solution)|39.0%|简单|&nbsp;|


