交互题介绍：https://loj.ac/problem/6
题意：输出Q X ，读入><= 来猜数，小于50步猜出就算过样例
题解：根本不需要每次输出要打cout.flush()。。。
ac:
#include<iostream> #include<string> using namespace std; int main() { int l = 1, r = 1e9; while (l <= r) { int mid = (l + r) / 2; cout << ‘Q‘ << ‘ ‘ << mid << endl; string c; cin >> c; //if (c == "=") { break; } if (c == "<") r = mid - 1; else l = mid + 1; } cout << ‘Q‘ << ‘ ‘ << l << endl; }
//看到一个Bangladesh University of Business & Technology的老哥的代码，给跪了（借用一下）
