374.|374. Guess Number Higher or Lower
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Total Accepted: 46483
Total Submissions: 133710
Difficulty: Easy
Contributor: LeetCode
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'll tell you whether the number is higher or lower.
You call a pre-defined API guess(int num)
which returns 3 possible results (-1
, 1
, or 0
):
-1 : My number is lower 1 : My number is higher 0 : Congrats! You got it!
Example:
n = 10, I pick 6.Return 6.
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(E) First Bad Version (M) Guess Number Higher or Lower II
/* The guess API is defined in the parent class GuessGame.
@param num, your guess
@return -1 if my number is lower, 1 if my number is higher, otherwise return 0
int guess(int num);
*/public class Solution extends GuessGame {
public int guessNumber(int n) {
int start = 0, end = n;
while (start <= end) {
int mid = start + (end - start) / 2;
int val = guess(mid);
if (val == 0) {
return mid;
} else if (val == -1) {
end = mid - 1;
} else if (val == 1) {
start = mid + 1;
}
}
return start;
}
}
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