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摘要： Problem: On an N x N grid, each square grid[i][j] represents the elevation at that point (i,j). Now rain starts to fall. At time t, the depth of the w 阅读全文

摘要： Problem: Given an integer array, return the k-th smallest distance among all the pairs. The distance of a pair (A, B) is defined as the absolute diffe 阅读全文

摘要： Problem: On a horizontal number line, we have gas stations at positions stations[0], stations[1], ..., stations[N-1], where N = stations.length. Now, 阅读全文

摘要： Problem: Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make 阅读全文

摘要： SQL Index 阅读全文

摘要： Problem: Table number contains many numbers in column num including duplicated ones. Can you write a SQL query to find the biggest number, which only 阅读全文

摘要： Problem: Given an array A, partition it into two (contiguous) subarrays left and right so that: Every element in left is less than or equal to every e 阅读全文

摘要： 序： 用于记录刷题过程中难度较大或思路怪异的题目，对于常规难度一般的题就不写入我的博客了，关于效率仅是提交时击败的百分比，可能会随时间波动，仅供参考，算法优劣以时间复杂度和空间复杂度为基准。欢迎留言讨论。 阅读全文

摘要： Problem: In this problem, a rooted tree is a directed graph such that, there is exactly one node (the root) for which all other nodes are descendants 阅读全文

摘要： Problem: Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You m 阅读全文