#include "grader.h"
#include<iostream>
#include<vector>
using namespace std;
int HC(int n) {
int l = 1;
int r = n;
while (l < r) {
Guess(l);
int x = Guess(r);
int mid = (l + r) / 2;
if (x == 0) {
return mid;
}
if (x == -1) {
r = mid - (((l + r) % 2) == 0);
}
if (x == 1) {
l = mid + 1;
}
}
return l;
}
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