Algorithm | problem | algorithm HTTP://COMMUNITY.CSDN.NET/EXPERT/TOPIC/3735/3735144.XML?TEMP=8.680362E-02
<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
<title>javascript version v1.0</title>
<meta http-equiv= "REFRESH" content=10; Url=*.*>
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 ">
<body>
<br>
Compute 24 Dots (add, subtract, multiply, divide, bracket) JavaScript version v1.0<br><br>
<br><br><br><br>
<form>
<div align=center>
Time limit (10 seconds) <br><br>
<input type= "text" name= "fa" value= "<%=l1%>" size= "ten" >
<input type= "text" name= "fb" value= "<%=l2%>" size= "ten" >
<input type= "text" name= "FC" Value= "<%=l3%>" size= "ten" >
<input type= "text" name= "FD" value= "<%=l4%>" size= "ten" >
<br><br><input type= "button" Name= "btn" onclick= "Javascript:funcount ()" value= "View Answer" >
</div></form>
<script language= "JavaScript" >
function log (str)
{
document.write ("<br>" +str);
}
Generate a calculation expression
function Genexpress (EXP,A,B,C,D,M1,M2,M3)
{
Var
Exp=exp.replace ("A", a);
Exp=exp.replace ("B", b);
Exp=exp.replace ("C", c);
Exp=exp.replace ("D", D);
Exp=exp.replace ("M1", M1);
Exp=exp.replace ("M2", m2);
Exp=exp.replace ("M3", m3);
return exp;
}
var answer = new Array ()//Expression of correct answer
var counter = number of 0;//answers
Test expression is correct
function test (EXPN,A,B,C,D,M1,M2,M3)
{
var exp;
VAR ret;
Exp = genexpress (EXPN,A,B,C,D,M1,M2,M3);//Generate a calculation expression
Eval ("ret =" +exp);
if (Ret-24 < 0.1 && ret-24 >= 0)
{
Exp = Exp.replace (";", "");
Exp = ReplaceAll (exp, "*", "X");
Exp = ReplaceAll (exp, "/", "a");
var have = false;
for (var i=0; i<counter; i++)
{
if (exp = = Answer[i])
{
have = true;
Break
}
}
if (!have)
{
Answer[counter] = exp;
counter++;
Log ("<font color=red><b>" +counter+ ":" +exp+ "</b></font>");
}
}
}
function ReplaceAll (Streng, Soeg, Erstat)
{
var st = Streng;
if (soeg.length = 0)
Return St;
var idx = st.indexof (SOEG);
while (idx >= 0)
{
st = st.substring (0,IDX) + Erstat + st.substr (idx+soeg.length);
IDX = St.indexof (SOEG);
}
Return St;
}
var n = new Array ();//four digits
Receives the number of four input boxes, invokes the main program
function Funcount ()
{
N[0] = Document.forms[0].fa.value;
N[1] = Document.forms[0].fb.value;
N[2] = Document.forms[0].fc.value;
N[3] = Document.forms[0].fd.value;
if (N[0] > 0 && n[1] > 0 && n[2] > 0 && n[3] > 0 && n[0] < && n [1] < && n[2] < && n[3] < 14)
{
Log ("<font size=5><b>", "+n[0]+", "+n[1]+", "+n[2]+", "+n[3]+" 24-point answer:</b></font><br> ");
Log ("<input type= ' button ' ><br>");
Funmain ();
if (counter = 0)
{
Log ("no answer!") ");
}
}
Else
{
Alert ("Input error!) ");
}
}
Main program
function Funmain ()
{
var m = new Array ();
Four kinds of operators
M[0] = "+";
M[1] = "-";
M[2] = "*";
M[3] = "/";
11 Kinds of expressions
var exp1 = "A m1 b m2 c M3 D;";
var exp2 = "(a m1 B) m2 C M3 D;";
var exp3 = "(A m1 B m2 c) M3 D;";
var exp4 = "((a M1 B) M2 c) M3 D;";
var exp5 = "(A m1 (b m2 c)) M3 D;";
var exp6 = "A m1 (b m2 c) M3 D;";
var exp7 = "A m1 (b m2 c m3 D);";
var EXP8 = "A m1 ((b m2 c) M3 D); &qu
