374. Guess Number Higher or Lower
Easy
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:
Example 2:
Example 3:
Constraints:
1 <= n <= 231 - 1
1 <= pick <= n
解題
這題使用Binary Search的技巧
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