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<![CDATA[
<html>
<head><title>CONNECT 4</title></head>
<script language="JavaScript">
<!--
function GetTop(col) {
return this.top[col];
}
function GetElem(row,col) {
return this.table[row][col];
}
function DropElem(col,n) {
var row = this.GetTop(col);
this.table[row][col] = n;
this.top[col]--;
}
function RemoveElem(col) {
var row = this.GetTop(col) + 1;
this.table[row][col] = 0;
this.top[col]++;
}
function Clear() {
for (var col = 0; col < 12; col++) {
for (var row = 0; row < 12; row++)
this.table[row][col] = 0;
this.top[col] = 11;
}
}
function MakeTop(n) {
this.length = 12;
for (var i = 0; i < 12; i++)
this[i] = n;
return this;
}
function MakeTable() {
this.length = 12;
for (var i = 0; i < 12; i++)
this[i] = new MakeTop(0);
return this;
}
function DoClick(col) {
var str = "?";
if (col < 10) str+= "0" + col;
else str+= col;
return str;
}
function Chek(num,col,elem,dir,k) {
var cnt=1,x,y,c,r;
var stop = false;
c = col;
r = this.GetTop(c) + k;
if ((r == 12) || ((k==1)&&(this.GetElem(r,c)!=elem))) return false;
if (dir == 1) {
x=0; y=1; }
else if (dir == 2) {
x=1; y=1; }
else if (dir == 3) {
x=1; y=0; }
else {x=1; y=-1; }
while (!stop) {
c+=x; r+=y;
stop = ((c<1)||(c>11)||(r>11)||(r<this.GetTop(c))||(this.GetElem(r,c)!=elem));
if (!stop) cnt++;
}
c = col;
r = this.GetTop(c) + k;
x=-x; y=-y; stop=false;
while (!stop) {
c+=x; r+=y;
stop = ((c<1)||(c>11)||(r>11)||(r<this.GetTop(c))||(this.GetElem(r,c)!=elem));
if (!stop) cnt++;
}
return (cnt == num);
}
function ChekN(n,col,elem,k) {
var chk=false,dir=1;
while (!chk && (dir <=4)){
chk = this.Chek(n,col,elem,dir,k);
dir++;
}
return chk;
}
function Chek3n(elem) {
var tcol1=1,tcol2,idx;
var chk = false;
while ((tcol1 < 12) && (this.GetTop(tcol1) == 0)) tcol1++;
while (!chk && (tcol1 < 12)) {
this.DropElem(tcol1,elem);
tcol2 = 1;
while ((tcol2 < 12) && (this.GetTop(tcol2) == 0)) tcol2++;
idx = 0;
while ((tcol2 < 12) && (idx < 2)) {
if (this.ChekN(4,tcol2,elem,0)) idx++;
tcol2++;
while (!chk && (tcol2 < 12) && (this.GetTop(tcol2) == 0)) tcol2++;
}
if (idx == 2) {
chk = true;
gcol = tcol1;
}
this.RemoveElem(tcol1);
tcol1++;
while (!chk && (tcol1 < 12) && (this.GetTop(tcol1) == 0)) tcol1++;
}
return chk;
}
function Cheknx(n,elem) {
var tcol=1,dr,idx;
var chk = false;
while ((tcol < 12) && (this.GetTop(tcol) == 0)) tcol++;
while (!chk && (tcol < 12)) {
this.DropElem(tcol,elem);
dr = 1;
idx = 0;
while ((dr <= 4) && !this.Chek(n,tcol,elem,dr,1)) dr++;
if (dr <=4) {
if ((elem==2) && !this.ChekN(4,tcol,2,0)) {
chk = true;
gcol = tcol;
}
else if ((elem==1) && !this.Chek3n(2) && !this.ChekN(4,tcol,2,0)) {
chk = true;
gcol = tcol;
}
}
this.RemoveElem(tcol);
tcol++;
while (!chk && (tcol < 12) && (this.GetTop(tcol) == 0)) tcol++;
}
return chk;
}
function Chek2n(elem) {
var tcol=1,dr,idx;
var chk = false;
while ((tcol < 12) && (this.GetTop(tcol) == 0)) tcol++;
while (!chk && (tcol < 12)) {
this.DropElem(tcol,elem);
dr = 1;
idx = 0;
while ((dr <= 4) && (idx < 2)) {
if (this.Chek(2,tcol,elem,dr,1)) idx++;
dr++;
}
if (idx == 2) {
if ((elem==2) && !this.ChekN(4,tcol,2,0)) {
chk = true; gcol = tcol; }
else if ((elem==1) && !this.Chek3n(2) && !this.ChekN(4,tcol,2,0)) {
chk = true;
gcol = tcol;
}
}
this.RemoveElem(tcol);
tcol++;
while (!chk && (tcol < 12) && (this.GetTop(tcol) == 0)) tcol++;
}
return chk;
}
function Move(str) {
var col = (- -str.substring(1,2)) * 10 + (- -str.substring(2,3));
this.DropElem(col,2);
for (col=1;col<12;col++)
if (this.ChekN(4,col,2,1)) return 2;
for (col=1;col<12;col++)
if ((this.GetTop(col)>0) && this.ChekN(4,col,1,0)) {
this.DropElem(col,1); return 1; }
for (col=1;col<12;col++)
if ((this.GetTop(col)>0) && this.ChekN(4,col,2,0)) {
this.DropElem(col,1); return 0; }
if (this.Chek3n(1)) this.DropElem(gcol,1);
else if (this.Chek3n(2)) {
this.DropElem(gcol,1);
if (this.ChekN(4,gcol,2,0)) {
this.RemoveElem(gcol);
this.DropElem(gcol,2);
for(col=1;(col<12) && !this.ChekN(4,col,2,0);col++);
this.DropElem(col,1);
this.RemoveElem(gcol);
}
}
else if (this.Chek2n(1)) this.DropElem(gcol,1);
else if (this.Cheknx(3,2)) this.DropElem(gcol,1);
else if (this.Cheknx(2,1)) this.DropElem(gcol,1);
else if (this.Cheknx(3,1)) this.DropElem(gcol,1);
else if (this.Cheknx(2,2)) this.DropElem(gcol,1);
else {
col = 1;
while ((col<12) && (!this.GetTop(col)==0)) col++;
if (col == 12) return 3;
else this.DropElem(col,1);
}
return 0;
}
function NewBoard() {
this.table = new MakeTable();
this.top = new MakeTop(11);
this.GetTop = GetTop;
this.GetElem = GetElem;
this.DropElem = DropElem;
this.RemoveElem = RemoveElem;
this.DoClick = DoClick;
this.Move = Move;
this.Chek = Chek;
this.ChekN = ChekN;
this.Clear = Clear;
this.Chek3n = Chek3n;
this.Cheknx = Cheknx;
this.Chek2n = Chek2n;
return this;
}
var board = new NewBoard();
var gcol;
// -->
</script>
<frameset cols = "0,*">
<frame src="p173-2.html" name=left noresize>
<frame src="p173-1.html" name=game noresize>
</frameset>
</html>
</frame>
</html>
]]>
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