We are playing the Guess Game. The game is as follows:
I pick a number from 1 to n. You have to guess which number I picked.
Every time you guess wrong, I will tell you whether the number I picked is higher or lower than your guess.
You call a pre-defined API int guess(int num), which returns three possible results:
-1: Your guess is higher than the number I picked (i.e. num > pick).1: Your guess is lower than the number I picked (i.e. num < pick).0: your guess is equal to the number I picked (i.e. num == pick).Return the number that I picked.
Example 1:
Input: n = 10, pick = 6 Output: 6
Example 2:
Input: n = 1, pick = 1 Output: 1
Example 3:
Input: n = 2, pick = 1 Output: 1
Constraints:
1 <= n <= 231 - 11 <= pick <= n
class Solution {
public:
int guessNumber(int n) {
long int mid=n/2;
long int start=1;
long int end=n;
while(start<end)
{
mid=(start+end)/2;
if(guess(mid)==0)return mid;
else if(guess(mid)==-1) end=mid-1;
else if(guess(mid)==1)start=mid+1;
}
return start;
}
};
Office:- 660, Sector 14A, Vasundhara, Ghaziabad, Uttar Pradesh - 201012, India
