xinyu04

摘要： Given an array of integers nums and an integer k, return the total number of subarrays whose sum equals to k. A subarray is a contiguous non-empty seq 阅读全文

摘要： Design a data structure that follows the constraints of a Least Recently Used(LRU) cache. Implement the LRUCache class: LRUCache(int capacity) Initial 阅读全文

摘要： You are given an array prices where prices[i] is the price of a given stock on the $i$-th day. Find the maximum profit you can achieve. You may comple 阅读全文

摘要： Given a string s which represents an expression, evaluate this expression and return its value. The integer division should truncate toward zero. You 阅读全文

摘要： You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in num 阅读全文

摘要： Given head which is a reference node to a singly-linked list. The value of each node in the linked list is either 0 or 1. The linked list holds the bi 阅读全文

摘要： Given a root node reference of a BST and a key, delete the node with the given key in the BST. Return the root node reference (possibly updated) of th 阅读全文

摘要： Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. Solution 不妨把左括号记为 阅读全文

摘要： Given two strings s and t of lengths m and n respectively, return the minimum window substring of s such that every character in t (including duplicat 阅读全文

摘要： Given an array of integers nums, sort the array in increasing order based on the frequency of the values. If multiple values have the same frequency, 阅读全文