摘要：
1、私有化构造器，不能直接创建，调用方法创建对象； 2、饿汉式：instance在类装载时就实例化 3、静态内部类： 阅读全文
摘要：
1、 Given an array of integers, find the subarray with smallest sum. Return the sum of the subarray. For [1, -1, -2, 1], return -3 2、 1、只需要求出最小值 2、利用su 阅读全文
摘要：
不大懂 1、 Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right which minimizes the sum of all numbers along its 阅读全文
摘要：
没搞懂 1、 Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the ne 阅读全文
摘要：
1、 Merge two sorted (ascending) linked lists and return it as a new sorted list. The new sorted list should be made by splicing together the nodes of 阅读全文
摘要：
1、 Given two sorted integer arrays A and B, merge B into A as one sorted array. A = [1, 2, 3, empty, empty], B = [4, 5] After merge, A will be filled 阅读全文
摘要：
1、 Merge two given sorted integer array A and B into a new sorted integer array. A=[1,2,3,4] B=[2,4,5,6] return [1,2,2,3,4,4,5,6] 2、思路 1、创建一个大集合 2、判断， 阅读全文
摘要：
1、 Given a collection of intervals, merge all overlapping intervals. 阅读全文