#include using namespa

#include using namespace std;int main(){\tconst int SIZE = 100;\tint n, f, i, left, right, middle, a[SIZE];\tcin>>n>>f;\tfor (i = 1; i <= n; i  )\t\tcin>>a[i];\tleft = 1;\tright = n;\tdo {\t\tmiddle = (left   right) / 2;\t\tif (f <= a[middle])\t\t\tright = middle;\t\telse\t\t\tleft = middle   1;\t} while (left < right);\tcout<
输入：
12 172 4 6 9 11 15 17 18 19 20 21 25
输出：