leetcode Kth Smallest Element in a Sorted Matrix 问题描述 Given a n x n matrix where each of the rows and columns are sorted in ascending order, find the kth smallest element in the matrix. Note that it is the kth
leetcode Insert Delete GetRandom O(1) Insert Delete GetRandom O(1) 问题描述 Design a data structure that supports all following operations in average O(1) time. insert(val): Inserts an item val to the set if not already present.
leetcode Remove Duplicates from Sorted Array Remove Duplicates from sorted array 问题描述 Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length. Do not allocate extra space for