(This problem is the same as Minimize Malware Spread, with the differences bolded.) In a network of nodes, each node i is directly connected to another node j if and only if graph[i][j] = 1. Some nodes initial are initially infected by malware.  When

(This problem is the same as Minimize Malware Spread, with the differences bolded.) In a network of nodes, each node i is directly connected to another node j if and only if graph[i][j] = 1. Some nodes initial are initially infected by malware.  When

In a network of nodes, each node i is directly connected to another node j if and only if graph[i][j] = 1. Some nodes initial are initially infected by malware.  Whenever two nodes are directly connected and at least one of those two nodes is infecte

In a network of nodes, each node i is directly connected to another node j if and only if graph[i][j] = 1. Some nodes initial are initially infected by malware.  Whenever two nodes are directly connected and at least one of those two nodes is infecte

python 深入理解 赋值.引用.拷贝.作用域 - 江召伟 - 博客园 https://www.cnblogs.com/jiangzhaowei/p/5740913.html a=[1,2,5]b=aprint(id(a),'--',id(b)) b=[9,8]print(id(a),'--',id(b)) f=7g=fprint(id(f),'--',id(g))g=888print(id(f),'--',id(g)) class c: def __init__(self,a): self.

Given two words (beginWord and endWord), and a dictionary's word list, find all shortest transformation sequence(s) from beginWord to endWord, such that: Only one letter can be changed at a time Each intermediate word must exist in the word list For

Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each number in C may only be used once in the combination. Note: All numbers (including target) will be posi

做完这道题,只能说基本功很重要,数组中套数组就不会用了,过几天吧1做了,看自己到底等没. https://oj.leetcode.com/problems/binary-tree-level-order-traversal-ii/ import java.util.*; /** * Definition for binary tree * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNod

一.探寻原因 在一个复杂的layout嵌套较多layout的android界面.在Android 2.3.内存较低 的机型上,出现 java.lang.StackOverflowError 这个Exception,appcrash退出. 这个错误出现的比較奇怪,在我做技术调研的时候,这个界面是放在4.0的系统中測试,工作非常正常,没有出现这个严重错误.        android SDK中对该错误的出现的场景描写叙述为:因为栈调用的层次太多.超过了虚拟器dalvik的最大限制(作为一个虚拟器參

Given a collection of numbers that might contain duplicates, return all possible unique permutations. Example: Input: [1,1,2] Output: [ [1,1,2], [1,2,1], [2,1,1] ] 有重复数字的情况,之前在Subsets II,我们采取的是在某一个递归内,用for循环处理所有重复数字.这里也相同,需要在递归内考虑重复数字,重复数字只能插入在已插入的重复

45. 跳跃游戏 II 动态规划 此题可以倒着想. 看示例: [2,3,1,1,4] 我们从后往前推,对于第4个数1,跳一次 对于第3个数1,显然只能跳到第4个数上,那么从第3个数开始跳到最后需要两次 对于第2个数3,显然一步到位,跳一次 对于第一个数2,只能选择跳一次还是跳两次,显然选择跳一次的收益更大,最终只需跳两次 倒着推时发现满足①最优子结构,②重叠子问题.可以使用动态规划. 状态描述:f[i]表示在第i个位置最小需要几次可跳到最后一个位置 状态转移方程:f[i] = min(f[i+1

Follow up for "Find Minimum in Rotated Sorted Array":What if duplicates are allowed? Would this affect the run-time complexity? How and why? Suppose a sorted array is rotated at some pivot unknown to you beforehand. (i.e., 0 1 2 4 5 6 7 might be

Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Note: Do not modify the linked list. Follow up:Can you solve it without using extra space? 141题的延伸,求出循环点. 可以用数学方法证明出slow与find相遇的位置一定是所求的点. /** * Definitio

Given a string s and a dictionary of words dict, add spaces in s to construct a sentence where each word is a valid dictionary word. Return all such possible sentences. For example, givens = "catsanddog",dict = ["cat", "cats"

Given an array of integers, every element appears three times except for one. Find that single one. Note:Your algorithm should have a linear runtime complexity. Could you implement it without using extra memory? 求出数组中只出现一次的数,剩下的都是三次. /** * Created by

Given a string s, partition s such that every substring of the partition is a palindrome. Return the minimum cuts needed for a palindrome partitioning of s. For example, given s = "aab",Return 1 since the palindrome partitioning ["aa",

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 complete as many transactions as you like (ie, buy one and sell one share of the stock multiple times). Ho

Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. Note:Could you optimize your algorithm to use only O(k) extra space? 上一道题的延伸版,就是直接求出第k行的数,要求用o(k)的空间复杂度. 也是直接相加就可以了. public class Solution { pub

Follow up for problem "Populating Next Right Pointers in Each Node". What if the given tree could be any binary tree? Would your previous solution still work? Note: You may only use constant extra space. For example,Given the following binary tr

Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example:Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ / \ 7 2 5 1 return [ [5,4,11,2], [5,8,4,5] ] 上一道题的延伸,求出所有结果. /**