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timKiemNhiPhan.c
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timKiemNhiPhan.c
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#include<stdio.h>
#include<malloc.h>
int * Readfromfile(int *n){
FILE *f =fopen("mangDon.txt","r");
int *A=(int*)malloc(sizeof(int));
int i=0;
while(!feof(f)){
fscanf(f,"%d",&A[i]);
i++;
A=realloc(A,sizeof(int)*(i+1));
}
*n=i;
fclose(f);
return A;
}
void printdata(int *a,int n){
int i;
printf("\nTong so luong cac phan tu: %d\n",n);
for(i=0;i<n;i++){
printf("%3d",a[i]);
}
}
//Tim kiem nhi phan
int TimKiemNhiPhan(int l,int r,int x,int *a){
if(l<=r){
int m=(l+r)/2;
if(x==a[m]){
return 1;
}
if(a[m]>x){//tim mang con ben trai
return TimKiemNhiPhan( l,m-1,x,a);
}
else if(a[m]<x){//tim mang con ben phai
return TimKiemNhiPhan( m+1,r,x,a);
}
}
else return 0;
}
int main(){
int n,*a= Readfromfile(&n);
printdata(a, n);
printf("\nTim kiem nhi phan:\n");
int x;
printf("Nhap gia tri can tim: ");scanf("%d",&x);
printf("\n%d",TimKiemNhiPhan(0,n-1,x,a));
}