摘要： 题目描述： Implement int sqrt(int x). Compute and return the square root of x. x is guaranteed to be a non-negative integer. 本题让我们写一个类似sqrt()的函数，不过返回值和输入值都 阅读全文

摘要： 题目描述： You are climbing a stair case. It takes n steps to reach to the top. Each time you can either climb 1 or 2 steps. In how many distinct ways can 阅读全文