題目鏈接
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.
解題思路
TODO （稍后補(bǔ)充）
解題代碼
// 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 myGuessNum = 1 + (n-1)/2;
int begin = 1;
int end = n;
while(1) {
int tip = guess(myGuessNum);
if (tip == 0) break;
if (tip < 0) {
end = myGuessNum-1;
myGuessNum = begin + (end - begin)/2;
//myGuessNum = (begin + end)/2;
}
else {
begin = myGuessNum+1;
myGuessNum = begin + (end - begin)/2;
//myGuessNum = (begin + end)/2;
}
}
return myGuessNum;
}
};
