abc_begin

摘要： Find the second max number in a given array. Notice You can assume the array contains at least two numbers. Find the second max number in a given arra 阅读全文

摘要： Given two non-negative integers num1 and num2 represented as string, return the sum of num1 and num2. Notice The length of both num1 and num2 is < 510 阅读全文

摘要： You have two numbers represented by a linked list, where each node contains a single digit. The digits are stored in forward order, such that the 1's 阅读全文

摘要： You have two numbers represented by a linked list, where each node contains a single digit. The digits are stored in reverse order, such that the 1's 阅读全文

摘要： Given an integer array, find the top k largest numbers in it. Given an integer array, find the top k largest numbers in it. Example Given [3,10,1000,- 阅读全文

摘要： Reverse digits of an integer. Returns 0 when the reversed integer overflows (signed 32-bit integer). Reverse digits of an integer. Returns 0 when the 阅读全文

摘要： Insert a node in a sorted linked list. Insert a node in a sorted linked list. Example Given list = 1->4->6->8 and val = 5. Return 1->4->5->6->8. 解法一： 阅读全文

摘要： 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 may comple 阅读全文

摘要： Implement a method to perform basic string compression using the counts of repeated characters. For example, the string aabcccccaaa would become a2b1c 阅读全文

摘要： Implement a stack. You can use any data structure inside a stack except stack itself to implement it. Implement a stack. You can use any data structur 阅读全文