Blackzxy - 博客园

LeetCode 111 Minimum Depth of Binary Tree BFS

摘要： Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest l 阅读全文

posted @ 2022-05-28 14:51 Blackzxy 阅读(14) 评论(0) 推荐(0) 编辑

LeetCode 230 Kth Smallest Element in a BST InOrder DFS中序遍历

摘要： Given the root of a binary search tree, and an integer k, return the kth smallest value (1-indexed) of all the values of the nodes in the tree. Soluti 阅读全文

posted @ 2022-05-26 15:19 Blackzxy 阅读(16) 评论(0) 推荐(0) 编辑

LeetCode 845 Longest Mountain in Array 正向DP+反向DP

摘要： You may recall that an array arr is a mountain array if and only if: arr.length >= 3 There exists some index i (0-indexed) with 0 < i < arr.length - 1 阅读全文

posted @ 2022-05-24 22:30 Blackzxy 阅读(16) 评论(0) 推荐(0) 编辑

LeetCode 1218 Longest Arithmetic Subsequence of Given Difference 哈希表HashMap

摘要： Given an integer array arr and an integer difference, return the length of the longest subsequence in arr which is an arithmetic sequence such that th 阅读全文

posted @ 2022-05-24 00:09 Blackzxy 阅读(12) 评论(0) 推荐(0) 编辑

Deep Learning Week7 Notes

摘要： 1. Tansposed Convolution Consider 1d convolution with kernel $k$: \[ \begin{align} y_i &= (x\circledast k)_i\\ &=\sum_a x_{i+a-1}k_a\\ &=\sum_u x_uk 阅读全文

posted @ 2022-05-23 22:56 Blackzxy 阅读(17) 评论(0) 推荐(0) 编辑

LeetCode 1130 Minimum Cost Tree From Leaf Values 思维

摘要： Given an array arr of positive integers, consider all binary trees such that: Each node has either 0 or 2 children; The values of arr correspond to th 阅读全文

posted @ 2022-05-23 17:36 Blackzxy 阅读(25) 评论(0) 推荐(0) 编辑

LeetCode 1014 Best Sightseeing Pair DP

摘要： You are given an integer array values where values[i] represents the value of the ith sightseeing spot. Two sightseeing spots i and j have a distance 阅读全文

posted @ 2022-05-22 02:32 Blackzxy 阅读(15) 评论(0) 推荐(0) 编辑

LeetCode 542 01 Matrix 多源BFS

摘要： Given an m x n binary matrix mat, return the distance of the nearest 0 for each cell. The distance between two adjacent cells is 1. Solution 给定一个 $01$ 阅读全文

posted @ 2022-05-20 05:01 Blackzxy 阅读(24) 评论(0) 推荐(0) 编辑

LeetCode 437 Path Sum III DFS

摘要： Given the root of a binary tree and an integer targetSum, return the number of paths where the sum of the values along the path equals targetSum. The 阅读全文

posted @ 2022-05-19 21:47 Blackzxy 阅读(16) 评论(0) 推荐(0) 编辑

机器学习中的优化 Optimization Chapter 3 Projected Gradient Descent(2)

摘要： 1. Smooth and strongly convex functions: $O(\log(1/\epsilon))$ steps $\large\textbf{Theorem 3.5}$: $f:dom(f) \rightarrow \mathbb{R} $ convex and d 阅读全文

posted @ 2022-05-19 19:53 Blackzxy 阅读(47) 评论(0) 推荐(0) 编辑

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