// Forward declaration of guess API.
// @param num, your guess
// @return -1 if my number is lower, 1 if my number is higher, otherwise return 0
int guess(int num);
class Solution {
public:
int guessNumber(int n) {
int lo = 1,hi = n;
int mid = 0;
while (lo<=hi)
{
mid = (((double)lo)/2+((double)hi)/2);
if(guess(mid)==0)
return mid;
if(guess(mid)==-1)
hi = mid -1;
if(guess(mid)==1)
lo = mid +1;
}
return -1;
}
};
374-guess-number-higher-or-lower
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