其他

◆ 安裝 Qt 以後要記得配置環境變數。在 Windows 下安裝以後，用 Qt Command Prompt 可以自動設定，但是要小心幹擾到其他程式的環境變數。較謹慎的辦法是自行開啟 bat 檔案查看所需操作，手動編輯環境變數。◆ Qt Creator 介面上有許多文字沒有設定字型，使用了系統的某個預設配置，導致滿眼都是醜陋的宋體英文。在註冊表的 HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows

http://www.embedu.org/Column/Column208.htm作者：曾宏安,華清遠見嵌入式學院講師。我們在網路編程中常見的一種做法是：建立好通訊端後以阻塞的方式讀寫，如果沒有資料可讀的話，程式會一直等待。事實上，網路狀況一直不斷變化，很有可能在通訊過程中出現網路連接斷開。我們在程式中有必要對這種情況進行檢測，從而及時做出響應。下面介紹幾種常用的逾時檢測方法（假設我們要求通過通訊端等待資料的最大時間為8秒）：一、

MatrixTime Limit: 3000MS Memory Limit: 65536KTotal Submissions: 14826 Accepted: 5583DescriptionGiven an N*N matrix A, whose elements are either 0 or 1. A[i, j] means the number in the i-th row and j-th column. Initially we have A[i, j] = 0 (1 <=

具體什麼原因我也不是很清楚，但是可以使用如下方法解決，即在檔案頭部加兩行 import matplotlibmatploblit.use('WXAgg')  或者，修改matplotlib的設定檔，一般位於/usr/local/lib/python2.7/dist-packages/matplotlib/mpl-data/matplotlibrc，修改如下backend: WXAgg如果還是沒用的話，可以嘗試安裝  python-wxtools,sudo apt-get install pyth

這題主要採用遞迴的方式解決，這樣代碼比較容易理解#include <iostream>#include <string>using namespace std;bool isMatch(const char *s, const char *p){if(p[0] == '*')return false;else if(p[0] == 0)return s[0] == 0;else if(p[0] == '.'){if(p[1] == '*'){if(p[2] ==

Lucky Coins SequenceTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 608 Accepted Submission(s): 319Problem DescriptionAs we all know,every coin has two sides,with one side facing up and another

Tree ConstructionTime Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 689    Accepted Submission(s): 369Problem DescriptionConsider a two-dimensional space with a set of points (xi, yi) that satisfy

轉載地址：http://blog.chinaunix.net/uid-20548989-id-2533161.html一、struct timeval結構體struct timeval結構體在time.h中的定義為：struct timeval{__time_t tv_sec;        /* Seconds.*/__suseconds_t tv_usec;  /* Microseconds.*/};其中，tv_sec為Epoch到建立struct

Faulhaber’s TriangleTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 152 Accepted Submission(s): 74Problem DescriptionThe sum of the mth powers of the first n integersS(n,m) = SUM ( j= 1 to n)(

Image RecognitionTime Limit: 6000/3000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 964    Accepted Submission(s): 371Problem DescriptionNow there is an image recognition problem for you. Now you are given an

TradeTime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2918    Accepted Submission(s): 930Problem DescriptionRecently, lxhgww is addicted to stock, he finds some regular patterns after a few days'

Antenna PlacementTime Limit: 1000MS Memory Limit: 65536KTotal Submissions: 5486 Accepted: 2743DescriptionThe Global Aerial Research Centre has been allotted the task of building the fifth generation of mobile phone nets in Sweden. The most striking

Special equationsTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 184 Accepted Submission(s): 92Special JudgeProblem Description　　Let f(x) = anxn +...+ a1x +a0, in which ai (0 <= i <= n) are

Electric waveTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 596 Accepted Submission(s): 173Problem DescriptionAli was doing a physic experiment which requires him to observe an electric wave. He

B. Routine Problemtime limit per test1 secondmemory limit per test256 megabytesinputstandard inputoutputstandard outputManao has a monitor. The screen of the monitor has horizontal to vertical length ratio a:b. Now he is going to watch a movie. The

Card CollectorTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1708 Accepted Submission(s): 780Special JudgeProblem DescriptionIn your childhood, do you crazy for collecting the beautiful cards in

       從大三到現在，出來校門整整一年了，最近覺得很浮躁，不知道該去做什麼，該怎麼去做，畢業了，離開那個墮落的天堂---大學，突然覺得俺學校挺好的，以往的抱怨煙消雲散。     

sigaction函數的功能是檢查或修改與指定訊號相關聯的處理動作（可同時兩種操作）。他是POSIX的訊號介面，而signal()是標準C的訊號介面(如果程式必須在非POSIX系統上運行，那麼就應該使用這個介面)給訊號signum設定新的訊號處理函數act， 同時保留該訊號原有的訊號處理函數oldactintsigaction(int signo,conststruct sigaction*restrict act,             struct sigaction*restrict

Pen CountsTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 205 Accepted Submission(s): 112Problem DescriptionChicken farmer Xiaoyan is getting three new chickens, Lucy, Charlie and CC. She wants to

The King’s Ups and DownsTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 163 Accepted Submission(s): 101Problem DescriptionThe king has guards of all different heights. Rather than line them up in