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Guess Number Higher or Lower
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Guess Number Higher or Lower
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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
CODE:
/**
* Forward declaration of guess API.
* @param num your guess
* @return -1 if num is higher than the picked number
* 1 if num is lower than the picked number
* otherwise return 0
* int guess(int num);
*/
public class Solution extends GuessGame
{
public int guessNumber(int n)
{
int i=1, j=n;
while(i<j)
{
int mid=i+(j-i)/2;
if(guess(mid)==0)
return mid;
else if(guess(mid)==1)
i=mid+1;
else
j=mid;
}
return i;
}
}