374. 猜数字大小
public class Solution : GuessGame {
public int GuessNumber(int right) {
var left = 1;
while (left < right)
{
int mid = (int)(((long)left + right) / 2);
var ret = guess(mid);
if (ret == 0) return mid;
if (ret < 0) right = mid - 1;
else left = mid + 1;
}
return left;
}
}