處理器史上兩次大的突破:流水線技術使得處理器可以同時執行多條指令;並行技術使得處理器可以同時執行多條線程。 最近在看WCET(Worst Case Execution Time, 最壞執行時間) 在軟體系統中,WCET包括三個方面:一是多核處理器時多任務對共用變數的操作引起的;二是分布式系統下master機查詢選擇Slave機所耗時間;三是網路請求和傳輸資料中消耗的時間。當然主要還是網路傳輸中耗時最多。 在嵌入式系統中,線程的執行時間包括:事件的觸發到回應時間、申請處理器的等待時間、
Divisor Summation Description Given a natural number n (1 <= n <= 500000), please output the summation of all its proper divisors. Definition: A proper divisor of a natural number is the divisor that is strictly
原題: Graph is a collection of edges E and vertices V. Graph has a wide variety of applications in computer.There are different ways to represent graph in computer. It can be represented by adjacency matrix or by adjacency list. There are some other
題目描述: Problem Description A clique is a complete graph, in which there is an edge between every pair of the vertices. Given a graph with N vertices and M edges, your task is to count the number of cliques with a specific size S in the graph.
在jquery中,before()和insertBefore()函數都有著一樣的功能,一樣的目的,也就是添加文本或html內容到匹配元素的前面,其主要的區別在於文法上的區別。 例如: <divclass="prettyBox">I'm a ipman</div> <divclass="prettyBox">I'm a ipman 2</div> 1