阅读程序写结果：
#include <iostream>using namespace std;int main(){const int SIZE = 100;int n, f, i, left, right, middle, a[SIZE];cin>>n>>f;for (i = 1; i <= n; i++)cin>>a[i]; left = 1;right = n;do {middle = (left + right) / 2;if (f <= a[middle])right = middle;elseleft = middle + 1;} while (left < right);cout<<left<<endl;return 0;}输入： 12 17 2 4 6 9 11 15 17 18 19 20 21 25