thuat toan timkien nhi phan c++

có ai giúp gấp cho em bài này được không, làm wài mà nó chẳng ra như ý cả. Chẳng là thuật toán tìm
kiếm nhị phân đó mà.
#include<graphics.h>
#include<conio.h>
#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#include<dos.h>
#include<iostream.h>
int array[100];
int mh=0,mode=0;
//-------------------------------------//
void Init_Graph(char*duongdan)
{
int gdriver = DETECT, gmode, errorcode;
initgraph(&gdriver, &gmode,duongdan);
errorcode = graphresult();
if (errorcode != grOk)
{
cout<<"Loi Khoi Tao Do Hoa: \n"<< grapherrormsg(errorcode);
getch();
exit(1);
}
}
//-----------------------------------
void KhoiTao_Mang(int a[100],int n)
{
for(int i=0;i<n;i++)
{
a[i]=random(100);
}

}
//-----------------------------------
void In_Mang(int a[100],int n)
{
for(int i=0;i<n;i++)
cout<<a[i]<<" ";
}
//----------------------------------
void SapXep(int a[100], int n)
{
for(int i=0;i<n-1;i++)
for(int j=i+1;j<n;j++)
{
if (a[i]>=a[j])
{
int tg=a[i];
a[i]=a[j];
a[j]=tg;
}
}
}
//---------------------------------------------
void Ve(int a[100],int n)
{
int Step;
char st[10];
SapXep(a,n);
Step=(getmaxx()-40)/n;
outtextxy(Step-7,165,"LEFT");
outtextxy(n*Step+Step-30,165,"RIGHT");

for(int i=0;i<n;i++)
{
outtextxy(i*Step+Step,117,"|");
setfillstyle(9,random(15));
itoa(a[i],st,10);
fillellipse(i*Step+Step+5,140,12,12);
//circle(i*Step+Step+5,140,12);
outtextxy(i*Step+Step,136,st);
}
int mid=(n)/2;
setfillstyle(9,RED);
itoa(a[mid],st,10);
fillellipse(mid*Step+Step+5,140,12,12);
outtextxy(mid*Step+Step,136,st);
}
//---------------------------------------------
int binarysearch(int a[100],int x,int n)
{
int left,right,mid;
char*tg;
left=0;
right=n-1;
int Step=(getmaxx()-40)/n;
while(left<=right)
{
mid=(left+right)/2;
if (a[mid]<x)
{
left=mid+1;
tg="left";

}
else
{
if (a[mid]>x)
{
right=mid-1;
tg="right";
}
else
return mid;
}
char*strmid;
while (!kbhit())
{
//delay(100);
gotoxy(5,7);cout<<" Vi tri:"<<mid;
setcolor(random(15));
circle(mid*Step+Step+5,140,16);
itoa(mid,strmid,10);
outtextxy(mid*Step+Step+2,107,strmid);
outtextxy(mid*Step+Step+2,165,tg);
}
getch();
}
return -1;
}
void main()
{
clrscr();
Init_Graph("c:\\borlandc\\BGI");

//Paint(start,n);
int n=15;
setbkcolor(BLUE);
setcolor(YELLOW);
rectangle(2,2,getmaxx()-2,getmaxy()-2);
rectangle(5,5,getmaxx()-5,getmaxy()-5);
KhoiTao_Mang(array,n);
gotoxy(17,2);cout<<"----- MO PHONG THUAT TOAN TIM KIEM NHI PHAN ----";
gotoxy(26,3);cout<<"Dinh Thu Hien - K8A - HVKTQS";
gotoxy(5,4);cout<<"* In Mang ban dau:\n";
gotoxy(5,5);
In_Mang(array,n);
setcolor(WHITE);
gotoxy(5,6);cout<<"* Bieu dien tren truc so:";
line(30,120,getmaxx()-30,120);
outtextxy(getmaxx()-30,117,">");
Ve(array,n);
int Step=(getmaxx()-40)/n;
int kq=binarysearch(array,44,n);
char*st;
if (kq!=-1)
{
while (!kbhit())
{
// delay(100);
gotoxy(5,7);cout<<" Vi tri tim thay:"<<kq;
setfillstyle(9,random(15));
itoa(kq,st,10);
setcolor(random(15));
circle(kq*Step+Step+5,140,16);

outtextxy(kq*Step+Step+2,107,st);
outtextxy(kq*Step+Step+2,200,"TIM THAY");
}
}
else
outtextxy(kq*Step+Step+2,200,"KHONG TIM THAY");
getch();
closegraph();
}