delphi could not convert variant of type (null) into type (olestr)

procedure TForm3.DBEdit1Change(Sender: TObject); //onchange事件
var
i:integer;
s:string;
xcom:tcomponent;
begin
for i := 2 to 20 do
begin
s:='edit'+inttostr(i);
xcom:=findcomponent(s);
if xcom<>nil then
begin
end;

procedure TForm3.FormShow(Sender: TObject);
begin

dbnavigator1.DataSource:=DataSource1;
dbgrid1.DataSource:=DataSource1;

edit1.Text:='';
f(); //外观设置的函数调用

procedure TForm3.ToolButton5Click(Sender: TObject); //刷新按钮
begin
f();
end;

Su-domino-ku 程序怎么写
Problem Description As if there were not already enough sudoku-like puzzles, the July 2009 issue of Games Magazine describes the following variant that combines facets of both sudoku and dominos. The puzzle is a form of a standard sudoku, in which there is a nine-by-nine grid that must be filled in using only digits 1 through 9. In a successful solution: Each row must contain each of the digits 1 through 9. Each column must contain each of the digits 1 through 9. Each of the indicated three-by-three squares must contain each of the digits 1 through 9. For a su-domino-ku, nine arbitrary cells are initialized with the numbers 1 to 9. This leaves 72 remaining cells. Those must be filled by making use of the following set of 36 domino tiles. The tile set includes one domino for each possible pair of unique numbers from 1 to 9 (e.g., 1+2, 1+3, 1+4, 1+5, 1+6, 1+7, 1+8, 1+9, 2+3, 2+4, 2+5, ...). Note well that there are not separate 1+2 and 2+1 tiles in the set; the single such domino can be rotated to provide either orientation. Also, note that dominos may cross the boundary of the three-by-three squares (as does the 2+9 domino in our coming example). To help you out, we will begin each puzzle by identifying the location of some of the dominos. For example, Figure 1 shows a sample puzzle in its initial state. Figure 2 shows the unique way to complete that puzzle. Input Each puzzle description begins with a line containing an integer N, for 10 ≤ N ≤ 35, representing the number of dominos that are initially placed in the starting configuration. Following that are N lines, each describing a single domino as U LU V LV. Value U is one of the numbers on the domino, and LU is a two-character string representing the location of value U on the board based on the grid system diagrammed in Figure 1. The variables V and LV representing the respective value and location of the other half of the domino. For example, our first sample input beings with a domino described as 6 B2 1 B3. This corresponds to the domino with values 6+1 being placed on the board such that value 6 is in row B, column 2 and value 1 in row B, column 3. The two locations for a given domino will always be neighboring. After the specification of the N dominos will be a final line that describes the initial locations of the isolated numbers, ordered from 1 to 9, using the same row-column conventions for describing locations on the board. All initial numbers and dominos will be at unique locations. The input file ends with a line containing 0. Output For each puzzle, output an initial line identifying the puzzle number, as shown below. Following that, output the 9x9 sudoku board that can be formed with the set of dominos. There will be a unique solution for each puzzle. Sample Input 10 6 B2 1 B3 2 C4 9 C3 6 D3 8 E3 7 E1 4 F1 8 B7 4 B8 3 F5 2 F6 7 F7 6 F8 5 G4 9 G5 7 I8 8 I9 7 C9 2 B9 C5 A3 D9 I4 A9 E5 A2 C6 I1 11 5 I9 2 H9 6 A5 7 A6 4 B8 6 C8 3 B5 8 B4 3 C3 2 D3 9 D2 8 E2 3 G2 5 H2 1 A2 8 A1 1 H8 3 I8 8 I3 7 I4 4 I6 9 I7 I5 E6 D1 F2 B3 G9 H7 C9 E5 0 Sample Output Puzzle 1 872643195 361975842 549218637 126754983 738169254 495832761 284597316 657381429 913426578 Puzzle 2 814267593 965831247 273945168 392176854 586492371 741358629 137529486 459683712 628714935
Su-domino-ku 数独问题
Problem Description As if there were not already enough sudoku-like puzzles, the July 2009 issue of Games Magazine describes the following variant that combines facets of both sudoku and dominos. The puzzle is a form of a standard sudoku, in which there is a nine-by-nine grid that must be filled in using only digits 1 through 9. In a successful solution: Each row must contain each of the digits 1 through 9. Each column must contain each of the digits 1 through 9. Each of the indicated three-by-three squares must contain each of the digits 1 through 9. For a su-domino-ku, nine arbitrary cells are initialized with the numbers 1 to 9. This leaves 72 remaining cells. Those must be filled by making use of the following set of 36 domino tiles. The tile set includes one domino for each possible pair of unique numbers from 1 to 9 (e.g., 1+2, 1+3, 1+4, 1+5, 1+6, 1+7, 1+8, 1+9, 2+3, 2+4, 2+5, ...). Note well that there are not separate 1+2 and 2+1 tiles in the set; the single such domino can be rotated to provide either orientation. Also, note that dominos may cross the boundary of the three-by-three squares (as does the 2+9 domino in our coming example). To help you out, we will begin each puzzle by identifying the location of some of the dominos. For example, Figure 1 shows a sample puzzle in its initial state. Figure 2 shows the unique way to complete that puzzle. Input Each puzzle description begins with a line containing an integer N, for 10 ≤ N ≤ 35, representing the number of dominos that are initially placed in the starting configuration. Following that are N lines, each describing a single domino as U LU V LV. Value U is one of the numbers on the domino, and LU is a two-character string representing the location of value U on the board based on the grid system diagrammed in Figure 1. The variables V and LV representing the respective value and location of the other half of the domino. For example, our first sample input beings with a domino described as 6 B2 1 B3. This corresponds to the domino with values 6+1 being placed on the board such that value 6 is in row B, column 2 and value 1 in row B, column 3. The two locations for a given domino will always be neighboring. After the specification of the N dominos will be a final line that describes the initial locations of the isolated numbers, ordered from 1 to 9, using the same row-column conventions for describing locations on the board. All initial numbers and dominos will be at unique locations. The input file ends with a line containing 0. Output For each puzzle, output an initial line identifying the puzzle number, as shown below. Following that, output the 9x9 sudoku board that can be formed with the set of dominos. There will be a unique solution for each puzzle. Sample Input 10 6 B2 1 B3 2 C4 9 C3 6 D3 8 E3 7 E1 4 F1 8 B7 4 B8 3 F5 2 F6 7 F7 6 F8 5 G4 9 G5 7 I8 8 I9 7 C9 2 B9 C5 A3 D9 I4 A9 E5 A2 C6 I1 11 5 I9 2 H9 6 A5 7 A6 4 B8 6 C8 3 B5 8 B4 3 C3 2 D3 9 D2 8 E2 3 G2 5 H2 1 A2 8 A1 1 H8 3 I8 8 I3 7 I4 4 I6 9 I7 I5 E6 D1 F2 B3 G9 H7 C9 E5 0 Sample Output Puzzle 1 872643195 361975842 549218637 126754983 738169254 495832761 284597316 657381429 913426578 Puzzle 2 814267593 965831247 273945168 392176854 586492371 741358629 137529486 459683712 628714935
Su-domino-ku 的具体代码
Problem Description As if there were not already enough sudoku-like puzzles, the July 2009 issue of Games Magazine describes the following variant that combines facets of both sudoku and dominos. The puzzle is a form of a standard sudoku, in which there is a nine-by-nine grid that must be filled in using only digits 1 through 9. In a successful solution: Each row must contain each of the digits 1 through 9. Each column must contain each of the digits 1 through 9. Each of the indicated three-by-three squares must contain each of the digits 1 through 9. For a su-domino-ku, nine arbitrary cells are initialized with the numbers 1 to 9. This leaves 72 remaining cells. Those must be filled by making use of the following set of 36 domino tiles. The tile set includes one domino for each possible pair of unique numbers from 1 to 9 (e.g., 1+2, 1+3, 1+4, 1+5, 1+6, 1+7, 1+8, 1+9, 2+3, 2+4, 2+5, ...). Note well that there are not separate 1+2 and 2+1 tiles in the set; the single such domino can be rotated to provide either orientation. Also, note that dominos may cross the boundary of the three-by-three squares (as does the 2+9 domino in our coming example). To help you out, we will begin each puzzle by identifying the location of some of the dominos. For example, Figure 1 shows a sample puzzle in its initial state. Figure 2 shows the unique way to complete that puzzle. Input Each puzzle description begins with a line containing an integer N, for 10 ≤ N ≤ 35, representing the number of dominos that are initially placed in the starting configuration. Following that are N lines, each describing a single domino as U LU V LV. Value U is one of the numbers on the domino, and LU is a two-character string representing the location of value U on the board based on the grid system diagrammed in Figure 1. The variables V and LV representing the respective value and location of the other half of the domino. For example, our first sample input beings with a domino described as 6 B2 1 B3. This corresponds to the domino with values 6+1 being placed on the board such that value 6 is in row B, column 2 and value 1 in row B, column 3. The two locations for a given domino will always be neighboring. After the specification of the N dominos will be a final line that describes the initial locations of the isolated numbers, ordered from 1 to 9, using the same row-column conventions for describing locations on the board. All initial numbers and dominos will be at unique locations. The input file ends with a line containing 0. Output For each puzzle, output an initial line identifying the puzzle number, as shown below. Following that, output the 9x9 sudoku board that can be formed with the set of dominos. There will be a unique solution for each puzzle. Sample Input 10 6 B2 1 B3 2 C4 9 C3 6 D3 8 E3 7 E1 4 F1 8 B7 4 B8 3 F5 2 F6 7 F7 6 F8 5 G4 9 G5 7 I8 8 I9 7 C9 2 B9 C5 A3 D9 I4 A9 E5 A2 C6 I1 11 5 I9 2 H9 6 A5 7 A6 4 B8 6 C8 3 B5 8 B4 3 C3 2 D3 9 D2 8 E2 3 G2 5 H2 1 A2 8 A1 1 H8 3 I8 8 I3 7 I4 4 I6 9 I7 I5 E6 D1 F2 B3 G9 H7 C9 E5 0 Sample Output Puzzle 1 872643195 361975842 549218637 126754983 738169254 495832761 284597316 657381429 913426578 Puzzle 2 814267593 965831247 273945168 392176854 586492371 741358629 137529486 459683712 628714935
Su-domino-ku 是怎么来写的
Problem Description As if there were not already enough sudoku-like puzzles, the July 2009 issue of Games Magazine describes the following variant that combines facets of both sudoku and dominos. The puzzle is a form of a standard sudoku, in which there is a nine-by-nine grid that must be filled in using only digits 1 through 9. In a successful solution: Each row must contain each of the digits 1 through 9. Each column must contain each of the digits 1 through 9. Each of the indicated three-by-three squares must contain each of the digits 1 through 9. For a su-domino-ku, nine arbitrary cells are initialized with the numbers 1 to 9. This leaves 72 remaining cells. Those must be filled by making use of the following set of 36 domino tiles. The tile set includes one domino for each possible pair of unique numbers from 1 to 9 (e.g., 1+2, 1+3, 1+4, 1+5, 1+6, 1+7, 1+8, 1+9, 2+3, 2+4, 2+5, ...). Note well that there are not separate 1+2 and 2+1 tiles in the set; the single such domino can be rotated to provide either orientation. Also, note that dominos may cross the boundary of the three-by-three squares (as does the 2+9 domino in our coming example). To help you out, we will begin each puzzle by identifying the location of some of the dominos. For example, Figure 1 shows a sample puzzle in its initial state. Figure 2 shows the unique way to complete that puzzle. Input Each puzzle description begins with a line containing an integer N, for 10 ≤ N ≤ 35, representing the number of dominos that are initially placed in the starting configuration. Following that are N lines, each describing a single domino as U LU V LV. Value U is one of the numbers on the domino, and LU is a two-character string representing the location of value U on the board based on the grid system diagrammed in Figure 1. The variables V and LV representing the respective value and location of the other half of the domino. For example, our first sample input beings with a domino described as 6 B2 1 B3. This corresponds to the domino with values 6+1 being placed on the board such that value 6 is in row B, column 2 and value 1 in row B, column 3. The two locations for a given domino will always be neighboring. After the specification of the N dominos will be a final line that describes the initial locations of the isolated numbers, ordered from 1 to 9, using the same row-column conventions for describing locations on the board. All initial numbers and dominos will be at unique locations. The input file ends with a line containing 0. Output For each puzzle, output an initial line identifying the puzzle number, as shown below. Following that, output the 9x9 sudoku board that can be formed with the set of dominos. There will be a unique solution for each puzzle. Sample Input 10 6 B2 1 B3 2 C4 9 C3 6 D3 8 E3 7 E1 4 F1 8 B7 4 B8 3 F5 2 F6 7 F7 6 F8 5 G4 9 G5 7 I8 8 I9 7 C9 2 B9 C5 A3 D9 I4 A9 E5 A2 C6 I1 11 5 I9 2 H9 6 A5 7 A6 4 B8 6 C8 3 B5 8 B4 3 C3 2 D3 9 D2 8 E2 3 G2 5 H2 1 A2 8 A1 1 H8 3 I8 8 I3 7 I4 4 I6 9 I7 I5 E6 D1 F2 B3 G9 H7 C9 E5 0 Sample Output Puzzle 1 872643195 361975842 549218637 126754983 738169254 495832761 284597316 657381429 913426578 Puzzle 2 814267593 965831247 273945168 392176854 586492371 741358629 137529486 459683712 628714935
access数据库，0xC0000005: 读取位置 0xe38e38e4 时发生访问冲突
void CdatabaseDlg::OnBnClickedSelect() { // TODO: 在此添加控件通知处理程序代码 int i = 0; // m_list.DeleteAllItems(); cmd.OnInitDialog(); UpdateData(true); // CRect rect; // 获取编程语言列表视图控件的位置和大小 // m_list.GetClientRect(&rect); // 为列表视图控件添加全行选中和栅格风格 // m_list.SetExtendedStyle(m_list.GetExtendedStyle() | LVS_EX_FULLROWSELECT | LVS_EX_GRIDLINES); // m_list.InsertColumn(0, _T("城市"), LVCFMT_LEFT, rect.Width() / 3); // m_list.InsertColumn(1, _T("区县"), LVCFMT_LEFT, rect.Width() / 3); // m_list.InsertColumn(2, _T("邮编"), LVCFMT_LEFT, rect.Width() / 3); { try { _variant_t RecordsAffected; cmd.m_pRecordset.CreateInstance(__uuidof(Recordset));//初始化Recordset指针 CString search_sql; search_sql = "SELECT * FROM 监视和测量设备"; cmd.m_pRecordset = cmd.m_pConnection->Execute(search_sql.AllocSysString(), NULL, adCmdText); while (!cmd.m_pRecordset->adoEOF) { CString name,department,user,category,number,number1,model,number2,category1,importance,oldpany; CString newpany,cost,date,date1,date2,number3,factory,test,grade,result,state,state1,no,information,date3; // CString chooseid; // CString choosevalue; name = cmd.m_pRecordset->GetCollect("name").bstrVal; m_list.InsertItem(i, name); department = cmd.m_pRecordset->GetCollect("part").bstrVal; m_list.SetItemText(i, 1, department); user = cmd.m_pRecordset->GetCollect("user").bstrVal; m_list.SetItemText(i, 2, user); category = cmd.m_pRecordset->GetCollect("category").bstrVal; m_list.SetItemText(i, 3, category); number = cmd.m_pRecordset->GetCollect("number").bstrVal; m_list.SetItemText(i, 4, number); number1 = cmd.m_pRecordset->GetCollect("number1").bstrVal; m_list.SetItemText(i, 5, number1); model = cmd.m_pRecordset->GetCollect("model").bstrVal; m_list.SetItemText(i, 6, model); number2 = cmd.m_pRecordset->GetCollect("number2").bstrVal; m_list.SetItemText(i, 7, number2); category1 = cmd.m_pRecordset->GetCollect("category1").bstrVal; m_list.SetItemText(i, 8, category1); importance = cmd.m_pRecordset->GetCollect("importance").bstrVal; m_list.SetItemText(i, 9, importance); oldpany = cmd.m_pRecordset->GetCollect("oldpany").bstrVal; m_list.SetItemText(i, 10, oldpany); newpany = cmd.m_pRecordset->GetCollect("newpany").bstrVal; m_list.SetItemText(i, 11, newpany); cost = cmd.m_pRecordset->GetCollect("cost").bstrVal; m_list.SetItemText(i, 12, cost); date = cmd.m_pRecordset->GetCollect("date").bstrVal; m_list.SetItemText(i, 13, date); date1 = cmd.m_pRecordset->GetCollect("date1").bstrVal; m_list.SetItemText(i, 14, date1); date2 = cmd.m_pRecordset->GetCollect("date2").bstrVal; m_list.SetItemText(i, 15, date2); number3 = cmd.m_pRecordset->GetCollect("number3").bstrVal; m_list.SetItemText(i, 16, number3); factory = cmd.m_pRecordset->GetCollect("factory").bstrVal; m_list.SetItemText(i, 17, factory); test = cmd.m_pRecordset->GetCollect("test").bstrVal; m_list.SetItemText(i, 18, test); grade = cmd.m_pRecordset->GetCollect("grade").bstrVal; m_list.SetItemText(i, 19, grade); result = cmd.m_pRecordset->GetCollect("result").bstrVal; m_list.SetItemText(i, 20, result); state = cmd.m_pRecordset->GetCollect("state").bstrVal; m_list.SetItemText(i, 21, state); state1 = cmd.m_pRecordset->GetCollect("state1").bstrVal; m_list.SetItemText(i, 22, state1); no = cmd.m_pRecordset->GetCollect("no").bstrVal; m_list.SetItemText(i, 23, no); information = cmd.m_pRecordset->GetCollect("information").bstrVal; m_list.SetItemText(i, 24, information); date3 = cmd.m_pRecordset->GetCollect("date3").bstrVal; m_list.SetItemText(i, 25, date3); cmd.m_pRecordset->MoveNext(); i++; } cmd.m_pRecordset->Close(); } catch (_com_error e) { AfxMessageBox(_T("搜索失败！")); return; } } } 执行到这date3 = cmd.m__pRecordset->GetCollect("date3").bstrVal; 再往下执行就报错，求大神指导，小白初学者
In Danger 怎么才能具体实现的
Description Flavius Josephus and 40 fellow rebels were trapped by the Romans. His companions preferred suicide to surrender, so they decided to form a circle and to kill every third person and to proceed around the circle until no one was left. Josephus was not excited by the idea of killing himself, so he calculated the position to be the last man standing (and then he did not commit suicide since nobody could watch). We will consider a variant of this "game" where every second person leaves. And of course there will be more than 41 persons, for we now have computers. You have to calculate the safe position. Be careful because we might apply your program to calculate the winner of this contest! Input The input contains several test cases. Each specifies a number n, denoting the number of persons participating in the game. To make things more difficult, it always has the format "xyez" with the following semantics: when n is written down in decimal notation, its first digit is x, its second digit is y, and then follow z zeros. Whereas 0<=x,y<=9, the number of zeros is 0<=z<=6. You may assume that n>0. The last test case is followed by the string 00e0. Output For each test case generate a line containing the position of the person who survives. Assume that the participants have serial numbers from 1 to n and that the counting starts with person 1, i.e., the first person leaving is the one with number 2. For example, if there are 5 persons in the circle, counting proceeds as 2, 4, 1, 5 and person 3 is staying alive. Sample Input 05e0 01e1 42e0 66e6 00e0 Sample Output 3 5 21 64891137

Videopoker 的问题的解答.
Problem Description Videopoker is the slot machine variant of the currently immensely popular game of poker. It is a variant on draw poker. In this game the player gets a hand consisting of five cards randomly drawn from a standard 52-card deck. From this hand, the player may discard any number of cards (between 0 and 5, inclusive), and change them for new cards randomly drawn from the remainder of the deck. After that, the hand is evaluated and the player is rewarded according to a payout structure. A common payout structure is as follows: Once you know the payout structure, you can determine for a given hand which cards you must change to maximize your expected reward. We'd like to know this expected reward, given a hand. Input On the first line one positive number: the number of testcases, at most 100. After that per testcase: * One line with nine integers xi (0 ≤ xi ≤ 1000\$) describing the payout structure. The numbers are in increasing order and describe the payout for one pair, two pair, etc, until the royal flush. * One line with one integer n (1 ≤ n ≤ 10): the number of starting hands to follow. * n lines, each describing a starting hand. A hand consists of five space separated tokens of the form Xs, with X being the rank (`2'...`9', `T', `J', `Q', `K' or `A') and s being the suit (`c', `d', `h' or `s'). Output Per testcase: * One line for each starting hand with a floating point number that is the maximal expected reward for that hand. These numbers must have an absolute or relative error less than 10-6. Sample Input 1 1 2 3 4 5 10 25 100 250 5 Ah Ac Ad As 2s Ks Qs Js Ts 2h Ks Qs 2d 2h 3s 2d 4h 5d 3c 9c 2h 3h 6d 8h Tc Sample Output 25.000000 8.9574468 1.5467160 0.9361702 0.6608135
Videopoker 的问题的极大
Problem Description Videopoker is the slot machine variant of the currently immensely popular game of poker. It is a variant on draw poker. In this game the player gets a hand consisting of five cards randomly drawn from a standard 52-card deck. From this hand, the player may discard any number of cards (between 0 and 5, inclusive), and change them for new cards randomly drawn from the remainder of the deck. After that, the hand is evaluated and the player is rewarded according to a payout structure. A common payout structure is as follows: Once you know the payout structure, you can determine for a given hand which cards you must change to maximize your expected reward. We'd like to know this expected reward, given a hand. Input On the first line one positive number: the number of testcases, at most 100. After that per testcase: * One line with nine integers xi (0 ≤ xi ≤ 1000\$) describing the payout structure. The numbers are in increasing order and describe the payout for one pair, two pair, etc, until the royal flush. * One line with one integer n (1 ≤ n ≤ 10): the number of starting hands to follow. * n lines, each describing a starting hand. A hand consists of five space separated tokens of the form Xs, with X being the rank (`2'...`9', `T', `J', `Q', `K' or `A') and s being the suit (`c', `d', `h' or `s'). Output Per testcase: * One line for each starting hand with a floating point number that is the maximal expected reward for that hand. These numbers must have an absolute or relative error less than 10-6. Sample Input 1 1 2 3 4 5 10 25 100 250 5 Ah Ac Ad As 2s Ks Qs Js Ts 2h Ks Qs 2d 2h 3s 2d 4h 5d 3c 9c 2h 3h 6d 8h Tc Sample Output 25.000000 8.9574468 1.5467160 0.9361702 0.6608135

MFC中已经导入了CAD相关的头文件，通过编程可以在CAD中画直线、写文字，现如今想再插入一个已知的放在C盘中的块参照，找到了相关的函数但是不会用， LPDISPATCH InsertBlock(VARIANT& InsertionPoint, LPCTSTR Name, double Xscale, double Yscale, double Zscale, double Rotation, VARIANT& Password) { LPDISPATCH result; static BYTE parms[] = VTS_VARIANT VTS_BSTR VTS_R8 VTS_R8 VTS_R8 VTS_R8 VTS_VARIANT ; InvokeHelper(0x62a, DISPATCH_METHOD, VT_DISPATCH, (void*)&result, parms, &InsertionPoint, Name, Xscale, Yscale, Zscale, Rotation, &Password); return result; } InsertPoint是块参照的插入点，Name是块的名称，Xscale是X比例，Rotation是插入块的比例，但是这Password不知道对应的是CAD中什么操作。向大佬请教，谢谢！
excel2016 64bit的vba中使用API函数RegisterClass注册窗体类就Excel就崩溃

Problem Description "Hike on a Graph" is a game that is played on a board on which an undirected graph is drawn. The graph is complete and has all loops, i.e. for any two locations there is exactly one arrow between them. The arrows are coloured. There are three players, and each of them has a piece. At the beginning of the game, the three pieces are in fixed locations on the graph. In turn, the players may do a move. A move consists of moving one's own piece along an arrow to a new location on the board. The following constraint is imposed on this: the piece may only be moved along arrows of the same colour as the arrow between the two opponents' pieces. In the sixties ("make love not war") a one-person variant of the game emerged. In this variant one person moves all the three pieces, not necessarily one after the other, but of course only one at a time. Goal of this game is to get all pieces onto the same location, using as few moves as possible. Find out the smallest number of moves that is necessary to get all three pieces onto the same location, for a given board layout and starting positions. Input The input file contains several test cases. Each test case starts with the number n. Input is terminated by n=0. Otherwise, 1<=n<=50. Then follow three integers p1, p2, p3 with 1<=pi<=n denoting the starting locations of the game pieces. The colours of the arrows are given next as a m×m matrix of whitespace-separated lower-case letters. The element mij denotes the colour of the arrow between the locations i and j. Since the graph is undirected, you can assume the matrix to be symmetrical. Output For each test case output on a single line the minimum number of moves required to get all three pieces onto the same location, or the word "impossible" if that is not possible for the given board and starting locations. Sample Input 3 1 2 3 r b r b b b r b r 2 1 2 2 y g g y 0 Sample Output 2 impossible

nand flash 启动坏块，有了解过的吗？

Linux(服务器编程):15---两种高效的事件处理模式（reactor模式、proactor模式）

C语言魔塔游戏

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Java工作4年来应聘要16K最后没要,细节如下。。。

2020年，冯唐49岁：我给20、30岁IT职场年轻人的建议

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Python绘图，圣诞树，花，爱心 | Turtle篇

CPU对每个程序员来说，是个既熟悉又陌生的东西？ 如果你只知道CPU是中央处理器的话，那可能对你并没有什么用，那么作为程序员的我们，必须要搞懂的就是CPU这家伙是如何运行的，尤其要搞懂它里面的寄存器是怎么一回事，因为这将让你从底层明白程序的运行机制。 随我一起，来好好认识下CPU这货吧 把CPU掰开来看 对于CPU来说，我们首先就要搞明白它是怎么回事，也就是它的内部构造，当然，CPU那么牛的一个东...

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