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Copy file name to clipboardExpand all lines: README.md
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| # | Title | Solution | Difficulty |
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| <spanid="1840">1840</span> |[Maximum Building Height](https://leetcode.com/problems/maximum-building-height"最高建筑高度")|[Go](problems/maximum-building-height)| Hard |
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| <spanid="1839">1839</span> |[Longest Substring Of All Vowels in Order](https://leetcode.com/problems/longest-substring-of-all-vowels-in-order"所有元音按顺序排布的最长子字符串")|[Go](problems/longest-substring-of-all-vowels-in-order)| Medium |
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| <spanid="1838">1838</span> |[Frequency of the Most Frequent Element](https://leetcode.com/problems/frequency-of-the-most-frequent-element"最高频元素的频数")|[Go](problems/frequency-of-the-most-frequent-element)| Medium |
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| <spanid="1837">1837</span> |[Sum of Digits in Base K](https://leetcode.com/problems/sum-of-digits-in-base-k"K 进制表示下的各位数字总和")|[Go](problems/sum-of-digits-in-base-k)| Easy |
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| <spanid="1836">1836</span> |[Remove Duplicates From an Unsorted Linked List](https://leetcode.com/problems/remove-duplicates-from-an-unsorted-linked-list) 🔒 |[Go](problems/remove-duplicates-from-an-unsorted-linked-list)| Medium |
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| <spanid="1835">1835</span> |[Find XOR Sum of All Pairs Bitwise AND](https://leetcode.com/problems/find-xor-sum-of-all-pairs-bitwise-and"所有数对按位与结果的异或和")|[Go](problems/find-xor-sum-of-all-pairs-bitwise-and)| Hard |
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| <spanid="1834">1834</span> |[Single-Threaded CPU](https://leetcode.com/problems/single-threaded-cpu"单线程 CPU")|[Go](problems/single-threaded-cpu)| Medium |
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| <spanid="1833">1833</span> |[Maximum Ice Cream Bars](https://leetcode.com/problems/maximum-ice-cream-bars"雪糕的最大数量")|[Go](problems/maximum-ice-cream-bars)| Medium |
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| <spanid="1832">1832</span> |[Check if the Sentence Is Pangram](https://leetcode.com/problems/check-if-the-sentence-is-pangram"判断句子是否为全字母句")|[Go](problems/check-if-the-sentence-is-pangram)| Easy |
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| <spanid="1831">1831</span> |[Maximum Transaction Each Day](https://leetcode.com/problems/maximum-transaction-each-day) 🔒 |[MySQL](problems/maximum-transaction-each-day)| Medium |
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| <spanid="1830">1830</span> |[Minimum Number of Operations to Make String Sorted](https://leetcode.com/problems/minimum-number-of-operations-to-make-string-sorted"使字符串有序的最少操作次数")|[Go](problems/minimum-number-of-operations-to-make-string-sorted)| Hard |
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| <spanid="1829">1829</span> |[Maximum XOR for Each Query](https://leetcode.com/problems/maximum-xor-for-each-query"每个查询的最大异或值")|[Go](problems/maximum-xor-for-each-query)| Medium |
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| <spanid="1828">1828</span> |[Queries on Number of Points Inside a Circle](https://leetcode.com/problems/queries-on-number-of-points-inside-a-circle"统计一个圆中点的数目")|[Go](problems/queries-on-number-of-points-inside-a-circle)| Medium |
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| <spanid="1827">1827</span> |[Minimum Operations to Make the Array Increasing](https://leetcode.com/problems/minimum-operations-to-make-the-array-increasing"最少操作使数组递增")|[Go](problems/minimum-operations-to-make-the-array-increasing)| Easy |
| <spanid="1825">1825</span> |[Finding MK Average](https://leetcode.com/problems/finding-mk-average"求出 MK 平均值")|[Go](problems/finding-mk-average)| Hard |
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| <spanid="1824">1824</span> |[Minimum Sideway Jumps](https://leetcode.com/problems/minimum-sideway-jumps"最少侧跳次数")|[Go](problems/minimum-sideway-jumps)| Medium |
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| <spanid="1823">1823</span> |[Find the Winner of the Circular Game](https://leetcode.com/problems/find-the-winner-of-the-circular-game"找出游戏的获胜者")|[Go](problems/find-the-winner-of-the-circular-game)| Medium |
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| <spanid="1822">1822</span> |[Sign of the Product of an Array](https://leetcode.com/problems/sign-of-the-product-of-an-array"数组元素积的符号")|[Go](problems/sign-of-the-product-of-an-array)| Easy |
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| <spanid="1821">1821</span> |[Find Customers With Positive Revenue this Year](https://leetcode.com/problems/find-customers-with-positive-revenue-this-year) 🔒 |[MySQL](problems/find-customers-with-positive-revenue-this-year)| Easy |
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| <spanid="1820">1820</span> |[Maximum Number of Accepted Invitations](https://leetcode.com/problems/maximum-number-of-accepted-invitations) 🔒 |[Go](problems/maximum-number-of-accepted-invitations)| Medium |
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| <spanid="1819">1819</span> |[Number of Different Subsequences GCDs](https://leetcode.com/problems/number-of-different-subsequences-gcds"序列中不同最大公约数的数目")|[Go](problems/number-of-different-subsequences-gcds)| Hard |
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| <spanid="1818">1818</span> |[Minimum Absolute Sum Difference](https://leetcode.com/problems/minimum-absolute-sum-difference"绝对差值和")|[Go](problems/minimum-absolute-sum-difference)| Medium |
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| <spanid="1817">1817</span> |[Finding the Users Active Minutes](https://leetcode.com/problems/finding-the-users-active-minutes"查找用户活跃分钟数")|[Go](problems/finding-the-users-active-minutes)| Medium |
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| <spanid="1807">1807</span> |[Evaluate the Bracket Pairs of a String](https://leetcode.com/problems/evaluate-the-bracket-pairs-of-a-string"替换字符串中的括号内容")|[Go](problems/evaluate-the-bracket-pairs-of-a-string)| Medium |
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| <spanid="1806">1806</span> |[Minimum Number of Operations to Reinitialize a Permutation](https://leetcode.com/problems/minimum-number-of-operations-to-reinitialize-a-permutation"还原排列的最少操作步数")|[Go](problems/minimum-number-of-operations-to-reinitialize-a-permutation)| Medium |
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| <spanid="1805">1805</span> |[Number of Different Integers in a String](https://leetcode.com/problems/number-of-different-integers-in-a-string"字符串中不同整数的数目")|[Go](problems/number-of-different-integers-in-a-string)| Easy |
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| <spanid="1804">1804</span> |[Implement Trie II (Prefix Tree)](https://leetcode.com/problems/implement-trie-ii-prefix-tree) 🔒 |[Go](problems/implement-trie-ii-prefix-tree)| Medium |
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| <spanid="1804">1804</span> |[Implement Trie II (Prefix Tree)](https://leetcode.com/problems/implement-trie-ii-prefix-tree"实现 Trie （前缀树） II") 🔒 |[Go](problems/implement-trie-ii-prefix-tree)| Medium |
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| <spanid="1803">1803</span> |[Count Pairs With XOR in a Range](https://leetcode.com/problems/count-pairs-with-xor-in-a-range"统计异或值在范围内的数对有多少")|[Go](problems/count-pairs-with-xor-in-a-range)| Hard |
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| <spanid="1802">1802</span> |[Maximum Value at a Given Index in a Bounded Array](https://leetcode.com/problems/maximum-value-at-a-given-index-in-a-bounded-array"有界数组中指定下标处的最大值")|[Go](problems/maximum-value-at-a-given-index-in-a-bounded-array)| Medium |
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| <spanid="1801">1801</span> |[Number of Orders in the Backlog](https://leetcode.com/problems/number-of-orders-in-the-backlog"积压订单中的订单总数")|[Go](problems/number-of-orders-in-the-backlog)| Medium |
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| <spanid="1786">1786</span> |[Number of Restricted Paths From First to Last Node](https://leetcode.com/problems/number-of-restricted-paths-from-first-to-last-node"从第一个节点出发到最后一个节点的受限路径数")|[Go](problems/number-of-restricted-paths-from-first-to-last-node)| Medium |
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| <spanid="1785">1785</span> |[Minimum Elements to Add to Form a Given Sum](https://leetcode.com/problems/minimum-elements-to-add-to-form-a-given-sum"构成特定和需要添加的最少元素")|[Go](problems/minimum-elements-to-add-to-form-a-given-sum)| Medium |
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| <spanid="1784">1784</span> |[Check if Binary String Has at Most One Segment of Ones](https://leetcode.com/problems/check-if-binary-string-has-at-most-one-segment-of-ones"检查二进制字符串字段")|[Go](problems/check-if-binary-string-has-at-most-one-segment-of-ones)| Easy |
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| <spanid="1783">1783</span> |[Grand Slam Titles](https://leetcode.com/problems/grand-slam-titles) 🔒 |[MySQL](problems/grand-slam-titles)| Medium |
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| <spanid="1783">1783</span> |[Grand Slam Titles](https://leetcode.com/problems/grand-slam-titles"大满贯数量") 🔒 |[MySQL](problems/grand-slam-titles)| Medium |
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| <spanid="1782">1782</span> |[Count Pairs Of Nodes](https://leetcode.com/problems/count-pairs-of-nodes"统计点对的数目")|[Go](problems/count-pairs-of-nodes)| Hard |
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| <spanid="1781">1781</span> |[Sum of Beauty of All Substrings](https://leetcode.com/problems/sum-of-beauty-of-all-substrings"所有子字符串美丽值之和")|[Go](problems/sum-of-beauty-of-all-substrings)| Medium |
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| <spanid="1780">1780</span> |[Check if Number is a Sum of Powers of Three](https://leetcode.com/problems/check-if-number-is-a-sum-of-powers-of-three"判断一个数字是否可以表示成三的幂的和")|[Go](problems/check-if-number-is-a-sum-of-powers-of-three)| Medium |
| <spanid="1750">1750</span> |[Minimum Length of String After Deleting Similar Ends](https://leetcode.com/problems/minimum-length-of-string-after-deleting-similar-ends"删除字符串两端相同字符后的最短长度")|[Go](problems/minimum-length-of-string-after-deleting-similar-ends)| Medium |
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| <spanid="1749">1749</span> |[Maximum Absolute Sum of Any Subarray](https://leetcode.com/problems/maximum-absolute-sum-of-any-subarray"任意子数组和的绝对值的最大值")|[Go](problems/maximum-absolute-sum-of-any-subarray)| Medium |
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| <spanid="1748">1748</span> |[Sum of Unique Elements](https://leetcode.com/problems/sum-of-unique-elements"唯一元素的和")|[Go](problems/sum-of-unique-elements)| Easy |
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| <spanid="1747">1747</span> |[Leetflex Banned Accounts](https://leetcode.com/problems/leetflex-banned-accounts) 🔒 |[MySQL](problems/leetflex-banned-accounts)| Medium |
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| <spanid="1746">1746</span> |[Maximum Subarray Sum After One Operation](https://leetcode.com/problems/maximum-subarray-sum-after-one-operation) 🔒 |[Go](problems/maximum-subarray-sum-after-one-operation)| Medium |
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| <spanid="1747">1747</span> |[Leetflex Banned Accounts](https://leetcode.com/problems/leetflex-banned-accounts"应该被禁止的Leetflex账户") 🔒 |[MySQL](problems/leetflex-banned-accounts)| Medium |
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| <spanid="1746">1746</span> |[Maximum Subarray Sum After One Operation](https://leetcode.com/problems/maximum-subarray-sum-after-one-operation"经过一次操作后的最大子数组和") 🔒 |[Go](problems/maximum-subarray-sum-after-one-operation)| Medium |
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| <spanid="1745">1745</span> |[Palindrome Partitioning IV](https://leetcode.com/problems/palindrome-partitioning-iv"回文串分割 IV")|[Go](problems/palindrome-partitioning-iv)| Hard |
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| <spanid="1744">1744</span> |[Can You Eat Your Favorite Candy on Your Favorite Day?](https://leetcode.com/problems/can-you-eat-your-favorite-candy-on-your-favorite-day"你能在你最喜欢的那天吃到你最喜欢的糖果吗？")|[Go](problems/can-you-eat-your-favorite-candy-on-your-favorite-day)| Medium |
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| <spanid="1743">1743</span> |[Restore the Array From Adjacent Pairs](https://leetcode.com/problems/restore-the-array-from-adjacent-pairs"从相邻元素对还原数组")|[Go](problems/restore-the-array-from-adjacent-pairs)| Medium |
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| <spanid="1742">1742</span> |[Maximum Number of Balls in a Box](https://leetcode.com/problems/maximum-number-of-balls-in-a-box"盒子中小球的最大数量")|[Go](problems/maximum-number-of-balls-in-a-box)| Easy |
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| <spanid="1741">1741</span> |[Find Total Time Spent by Each Employee](https://leetcode.com/problems/find-total-time-spent-by-each-employee) 🔒 |[MySQL](problems/find-total-time-spent-by-each-employee)| Easy |
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| <spanid="1741">1741</span> |[Find Total Time Spent by Each Employee](https://leetcode.com/problems/find-total-time-spent-by-each-employee"查找每个员工花费的总时间") 🔒 |[MySQL](problems/find-total-time-spent-by-each-employee)| Easy |
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| <spanid="1740">1740</span> |[Find Distance in a Binary Tree](https://leetcode.com/problems/find-distance-in-a-binary-tree"找到二叉树中的距离") 🔒 |[Go](problems/find-distance-in-a-binary-tree)| Medium |
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| <spanid="1739">1739</span> |[Building Boxes](https://leetcode.com/problems/building-boxes"放置盒子")|[Go](problems/building-boxes)| Hard |
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| <spanid="1738">1738</span> |[Find Kth Largest XOR Coordinate Value](https://leetcode.com/problems/find-kth-largest-xor-coordinate-value"找出第 K 大的异或坐标值")|[Go](problems/find-kth-largest-xor-coordinate-value)| Medium |
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| <spanid="1734">1734</span> |[Decode XORed Permutation](https://leetcode.com/problems/decode-xored-permutation"解码异或后的排列")|[Go](problems/decode-xored-permutation)| Medium |
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| <spanid="1733">1733</span> |[Minimum Number of People to Teach](https://leetcode.com/problems/minimum-number-of-people-to-teach"需要教语言的最少人数")|[Go](problems/minimum-number-of-people-to-teach)| Medium |
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| <spanid="1732">1732</span> |[Find the Highest Altitude](https://leetcode.com/problems/find-the-highest-altitude"找到最高海拔")|[Go](problems/find-the-highest-altitude)| Easy |
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| <spanid="1731">1731</span> |[The Number of Employees Which Report to Each Employee](https://leetcode.com/problems/the-number-of-employees-which-report-to-each-employee) 🔒 |[MySQL](problems/the-number-of-employees-which-report-to-each-employee)| Easy |
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| <spanid="1731">1731</span> |[The Number of Employees Which Report to Each Employee](https://leetcode.com/problems/the-number-of-employees-which-report-to-each-employee"每位经理的下属员工数量") 🔒 |[MySQL](problems/the-number-of-employees-which-report-to-each-employee)| Easy |
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| <spanid="1730">1730</span> |[Shortest Path to Get Food](https://leetcode.com/problems/shortest-path-to-get-food"获取食物的最短路径") 🔒 |[Go](problems/shortest-path-to-get-food)| Medium |
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## [454. 4Sum II (Medium)](https://leetcode.com/problems/4sum-ii"四数相加 II")
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<p>Given four lists A, B, C, D of integer values, compute how many tuples <code>(i, j, k, l)</code> there are such that <code>A[i] + B[j] + C[k] + D[l]</code> is zero.</p>
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<p>Given four integer arrays <code>nums1</code>, <code>nums2</code>, <code>nums3</code>, and <code>nums4</code> all of length <code>n</code>, return the number of tuples <code>(i, j, k, l)</code> such that:</p>
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<p>To make problem a bit easier, all A, B, C, D have same length of N where 0 ≤ N ≤ 500. All integers are in the range of -2<sup>28</sup> to 2<sup>28</sup> - 1 and the result is guaranteed to be at most 2<sup>31</sup> - 1.</p>
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