#include <stdio.h>

int find(int x[],int t)

{

int left=0, mid, right=14;/* 数字为角标 */

while(left<=right)

{

mid = (left + right) / 2;/*对于奇数和偶数都适用*/

if(t==x[mid])

{

return mid;

}

else

{

if(t>x[mid])

{

return left = mid+1;

}

else

{

return right = mid-1;

}

}

}

return -1;

}

main()

{

int a[15]={3,7,12,19,21,24,26,33,39,41,45,50,52,64,68};

printf("%d\n", find(a, 41));

}