[LeetCode]--119. Pascal's Triangle II
来源:互联网 发布:crm软件系统 编辑:程序博客网 时间:2024/06/16 06:46
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?
public List<Integer> getRow(int rowIndex) { List<Integer> list = new ArrayList<Integer>(); List<List<Integer>> resultList = new ArrayList<List<Integer>>(); int[][] temp = new int[rowIndex + 1][rowIndex + 1]; for (int i = 0; i < rowIndex + 1; i++) { temp[i][0] = 1; temp[i][i] = 1; for (int j = 0; j <= i; j++) { if (j < i && i > 1 && j > 0) temp[i][j] = temp[i - 1][j - 1] + temp[i - 1][j]; list.add(temp[i][j]); } resultList.add(list); list = new ArrayList<Integer>(); } return resultList.get(rowIndex); }
我开辟了两倍的空间,因为有一半没用山,这种也通过了,后来想着用一倍空间也能完成。
public List<Integer> getRow(int rowIndex) { List<Integer> list = new ArrayList<Integer>(); rowIndex++; list.add(1); for (int i = 1; i < rowIndex; i++) { List<Integer> temp = new ArrayList<Integer>(i + 1); //这里记住了,一定要进行初始化,然后set会出错 for (int j = 0; j < i + 1; j++) temp.add(-1); temp.set(0, list.get(0)); temp.set(i, list.get(i - 1)); for (int j = 1; j < i; j++) temp.set(j, list.get(j - 1) + list.get(j)); list = temp; } return list; }
0 0
- [LeetCode]118. Pascal's Triangle&119. Pascal's Triangle II
- LeetCode 119. Pascal's Triangle II
- 119. Pascal's triangle II Leetcode Python
- [LeetCode]119.Pascal's Triangle II
- [Leetcode] 119. Pascal's Triangle II
- [leetcode] 119.Pascal's Triangle II
- 【leetcode】119. Pascal's Triangle II
- 【Leetcode】119. Pascal's Triangle II
- 119. Pascal's Triangle II LeetCode
- [LeetCode]119. Pascal's Triangle II
- Leetcode 119. Pascal's Triangle II
- LeetCode *** 119. Pascal's Triangle II
- 【leetcode】119. Pascal's Triangle II
- LeetCode 119. Pascal's Triangle II
- leetcode-119. Pascal's Triangle II
- LeetCode 119. Pascal's Triangle II
- 【leetcode】119. Pascal's Triangle II
- LeetCode - 119. Pascal's Triangle II
- 进程死锁及解决方式
- 初尝Fresco
- Android图片中的三级缓存
- Handler消息传递机制学习
- 使用nodejs实现类似于C语言的scanf输入一个动态数组
- [LeetCode]--119. Pascal's Triangle II
- OpenSSL X509 Certificate反序列化漏洞(CVE-2015-3825)成因分析
- 聊聊ConcurrentHashMap那些事
- git学习
- 事务的传播特性
- 热修复技术
- java面向对象编程思想的理解
- CentOS 编译安装 php7 + nginx
- ZXing-jar集合