用二分查找法在已排序好的数组中查找输入的数。如果找到了输出该数的下标，否则输出“未找到”。（数组为：1,2,13,24,25,44,57,63,66,78,90,100）。-Using binary search in a sorted array to find a good number of inputs. If you find out the number of subscr ipts, otherwise output " not found."　(Array: 1,2,13,24,25,44,57,63,66,78,90,100).