标签： leetcode
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LeetCode25-Reverse-Nodes-in-kGroup
Given a linked list, reverse the nodes of a linked list…
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Leetcode-PHP题解D82-13-Roman-to-Integer
D82 13. Roman to Integer 题目链接 13. Roman to Integer 题目分析…
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LeetCode24-Swap-Nodes-in-Pairs
Given a linked list, swap every two adjacent nodes and …
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LeetCode23-Merge-k-Sorted-Lists
Merge k sorted linked lists and return it as one sorted…
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leetcode363-Max-Sum-of-Rectangle-No-Larger-Than-K
现有一个由整数构成的矩阵，问从中找到一个子矩阵，要求该子矩阵中各个元素的和为不超过k的最大值，问子矩阵中元素的…
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leetcode382-Linked-List-Random-Node
在等概率随机选择算法中，最经典的算法就是蓄水池算法。可以参考同类型题目398 random pick inde…
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LeetCode22-Generate-Parentheses
Given n pairs of parentheses, write a function to gener…
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Leetcode-PHP题解D81-520-Detect-Capital
如果给定单词是全大写或全小写的话，属于正确用法。 用array_count_values的结果和包含全大写或全…
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LeetCode21-Merge-Two-Sorted-Lists
Merge two sorted linked lists and return it as a new li…
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Leetcode-PHP题解D80-182-Duplicate-Emails
用GROUP BY把结果聚合，并用count函数计算出现次数。用having筛选出现次数大于1的结果即可。