#include "grader.h"
int HC(int n){
int l = 1, r = n;
int sol = 1;
int last = -1;
int v1, v2;
while(l < r){
if(last != l){ v1 = Guess(l); last = l; }
if(last != r){ v2 = Guess(r); last = r; }
int m = (l + r) / 2;
if(v2 == 0) return m;
if(v2 == -1) r = m - 1 + (l + r) % 2;
else l = m + 1;
}
return l;
}
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