摘要：
Sort an input string according to the given order string. There might be characters in input string that are not present in the order string and vice-versa. The characters of input string that are not present in the order string should come at the end of the output string in any order. Write code... 阅读全文
摘要：
1. A2. Ctrl+A3. Ctrl+C4. Ctrl+VIf you can only press the keyboard for N times (with the above four keys), please write a program to produce maximum numbers of A. If possible, please also print out the sequence of keys.So the input parameter is N (No. of keys that you can press), the output is M (No. 阅读全文
摘要：
Implement a queue in which push_rear(), pop_front() and get_min() are all constant time operations.http://www.careercup.com/question?id=7263132给出了很精彩的解答。主要的思想是维护一个min_queue，保存当前队列最小值，当新加入一个元素时，min_queue遵照这样的规则从min_queue的尾部开始和新加入元素（key）比较，当min_queue.back() > key时，弹出back()，直到back()<= key，或者min_q 阅读全文
摘要：
Given an array of integers, find out number of ways in which you can select increasing subsequences of length k(k<=n).for eg array is 1 4 6 2 5 & k=3then the answer is :1 4 5, 1 2 5,1 4 6,so ways are 5he first made me to write a recurrence then asked me to memoize that这题可以用dfs做，但显然耗时是指数级的。这种类 阅读全文