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? 这道题倒是不难,有个有意思的地方是可以优化到O(k)的空间复杂度.下面先上O(k^2)的算法. @Test public List<Integer>…

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? Subscribe to see which companies asked this question 依次在上一行的基础上计算下一行,技巧就是从后…

题目: 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? 题解: 为了达到O(k)的空间复杂度要求,那么就要从右向左生成结果.相当于你提前把上一行的计算出来,当前行就可以用上一次计算出的结果计算了…

当我们需要改变数组的值时,如果从前往后遍历,有时会带来很多麻烦,比如需要插入值,导致数组平移,或者新的值覆盖了旧有的值,但旧有的值依然需要被使用.这种情况下,有时仅仅改变一下数组的遍历方向,就会避免这些困难. 最直观的一题是 剑指Offer上的面试题 4 另外一道例题,就是LeetCode上的 Pascal's Triangle II Pascal's Triangle II Given an index k, return the kth row of the Pascal's triangl…

118. Pascal's Triangle 第一种解法:比较麻烦 https://leetcode.com/problems/pascals-triangle/discuss/166279/cpp-beats-1002018.9.3(with-annotation) class Solution { public: vector<vector<int>> generate(int numRows) { vector<vector<int>> result;…

[LeetCode]Pascal's Triangle II 解题报告 标签(空格分隔): LeetCode 题目地址:https://leetcode.com/problems/pascals-triangle-ii/description/ 题目描述: 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 yo…

118 - Pascal's Triangle Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] Solution: class Solution { public: vector<vector<int>> generate(int n…

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? [思路] 我们为了满足空间复杂度的要求,我们新建两个ArrayList,一个负责存储上一个Pascal行的结果,一个根据上一个Pascal行得出当前P…

Pascal's Triangle II Total Accepted: 19384 Total Submissions: 63446 My Submissions Question SolutionGiven 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 us…

Pascal's Triangle Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] class Solution: # @return a list of lists of integers def generate(self, numRows):…

package y2019.Algorithm.array; import java.util.ArrayList; import java.util.List; /** * @ProjectName: cutter-point * @Package: y2019.Algorithm.array * @ClassName: GetRow * @Author: xiaof * @Description: 119. Pascal's Triangle II * Given a non-negativ…

杨辉三角形II(Pascal's Triangle II) 问题 给出一个索引k,返回杨辉三角形的第k行. 例如,给出k = 3,返回[1, 3, 3, 1] 注意: 你可以优化你的算法使之只使用O(k)的额外空间吗? 初始思路 首先来复习复习杨辉三角形的性质(来自wiki): 杨辉三角以正整数构成,数字左右对称,每行由1开始逐渐变大,然后变小,回到1. 第行的数字个数为个. 第行的第个数字为组合数. 第行数字和为. 除每行最左侧与最右侧的数字以外,每个数字等于它的左上方与右上方两个数字之和(也…

119. Pascal's Triangle II Easy 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. Exa…

Triangle Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below. For example, given the following triangle [ [], [,4], [6,,7], [4,,8,3] ] The minimum path sum from top to bottom is…

一.Pascal's Triangle Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] class Solution { public: vector<vector<int>> generate(int numRows) { vect…

原文题目: 118. Pascal's Triangle 119. Pascal's Triangle II 读题: 杨辉三角问题 '''118''' class Solution(object): def generate(self, numRows): """ :type numRows: int :rtype: List[List[int]] """ if not numRows: return [] result = [] for i i…

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. Example: Input: 3 Output: [1,3,3,1]  原题地址:Pascal's Triangle II 题意: 杨辉三角 代码:  class Solution(object): def getRow(self,…

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…

题目来源 https://leetcode.com/problems/pascals-triangle-ii/ Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. 题意分析 Input:integer Output:kth row of the Pascal's triangle Conditions:只返回第n行 题目思路 同118,不…

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…

一天一道LeetCode 本系列文章已全部上传至我的github,地址:ZeeCoder's Github 欢迎大家关注我的新浪微博,我的新浪微博 欢迎转载,转载请注明出处 (一)题目 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 onl…

原题地址:https://oj.leetcode.com/problems/pascals-triangle-ii/ 题意: 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? 解题思路:思路同上一道题…

题目 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? 分析 与上题LeetCode 118 Pascal's Triangle本质相同: 需要注意的是,本题参数 k = 3 代表下标为3的那行元…

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? 118. Pascal's Triangle 的拓展,给一个索引k,返回杨辉三角的第k行. 解法:题目要求优化到 O(k) 的空间复杂,那么就不能把每…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题思路 方法一: 空间复杂度 O ( k ∗ ( k + 1 ) / 2 ) O(k * (k + 1) / 2) O(k∗(k+1)/2) 方法二:空间复杂度 O ( k ) O(k) O(k) 刷题心得 日期 [LeetCode] 题目地址:[https://leetcode.com/problems/pascals-triangle-ii/][1] T…

题目简述: 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? 解题思路: 这里的关键是空间的使用,既然只能用O(K)很容易就想到我们要进行回卷(名字好像不对).我的做法是每一次都在后面新加入一个数…

Problem: 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? Summary: 返回杨辉三角(帕斯卡三角)的第k行. Solution: 1. 若以二维数组的形式表示杨辉三角,则可轻易推算出ro…

题目: 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? 思路: 递归 package recursion; import java.util.List; import java.util.Arr…

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? 上一道题的延伸版,就是直接求出第k行的数,要求用o(k)的空间复杂度. 也是直接相加就可以了. public class Solution { pub…