Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. Note:Could you optimize your algorithm to use only O(k) extra space? 杨辉三角想必大家并不陌生,应该最早出现在初高中的数学中,其实就是二项式系数的一种写法. 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1
Given a non-negative index k where k ≤ 33, return the kth index row of the Pascal's triangle. Note that the row index starts from 0. In Pascal's triangle, each number is the sum of the two numbers directly above it. Example: Input: 3 Output: [1,3,3,1
Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. Note:Could you optimize your algorithm to use only O(k) extra space? 题目标签:Array 这道题目与之前那题不同的地方在于,之前是给我们一个行数n,让我们把这几行的全部写出来,这样就可以在每写新的一行的时候根据之前的那
巧妙实现杨辉三角代码 def triangles(): N=[1] #初始化为[1],杨辉三角的每一行为一个list while True: yield N #yield 实现记录功能,没有下一个next将跳出循环, S=N[:] #将list N赋给S,通过S计算每一行 S.append(0) #将list添加0,作为最后一个元素,长度增加1 N=[S[i-1]+S[i] for i in range(len(S))] #通过S来计算得出N n = 0 results = [] for t i