Sybase笔试题
1. 检测链表中是否有环
2. 库函数调用和系统调用区别何在
3. 输出一个字符串中字符的所有组合
4. 从一个文件中随机读出一个字符串
5. File Descriptor 和 File Pointer的区别
6. 如何判断一个变量是有符号数还是无符号数
7. x=x + 1; x++; ++x; x = x + 1; 的区别
(答案请参考《Expert C Programming》附录A)
上海纳拓软件
Problem 1 : Fast one-hot checker
A bit vector is one-hot if and only if there is at most one 1 in the vector. For example, 0000 and 00100 are one-hot and 00110 is not one-hot. Please find the fastest way to check whether a bit vector is one-hot or not.
Problem 2 : 3-Inverter
Assume that a logical blackbox has three Boolean inputs x, y, z and three Boolean outputs X, Y, Z where the outputs are defined as
X = ~x
Y = ~y
Z = ~z
Note that ~ stands for a NOT gate. Please realize this blackbox using only two NOT gates, and as many as possible AND and OR gates.
Problem 3 : Is it a loop ?
Assume that we have a head pointer to a link-list. Also assume that we know the list is single-linked. Can you come up an algorithm to check whether this link list includes a loop by using O(n) time and O(1) space where n is the length of the list? Furthermore, can you do so with O(n) time and only one register?
Problem 4 : Detect same sequence
Assume that we have a m*n matrix A where both m >= 1K and n >= 100K. X_i is a row vector of A where 1 <= i <= m. In other words, A = {X_1, X_2, ..., X_m}.
Please find a fastest algorithm to detect all pairs (X_i, X_j), where X_i == X_j.
