Blackzxy - 博客园

LeetCode 279 Perfect Squares DP

摘要： Given an integer n, return the least number of perfect square numbers that sum to n. A perfect square is an integer that is the square of an integer; 阅读全文

posted @ 2022-05-13 03:45 Blackzxy 阅读(18) 评论(0) 推荐(0) 编辑

LeetCode 198. House Robber DP

摘要： You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo 阅读全文

posted @ 2022-05-12 17:30 Blackzxy 阅读(14) 评论(0) 推荐(0) 编辑

LeetCode 221 Maximal Square DP

摘要： Given an m x n binary matrix filled with 0's and 1's, find the largest square containing only 1's and return its area. Solution 设 $dp[i][j]$ 表示能到达位置阅读全文

posted @ 2022-05-12 04:18 Blackzxy 阅读(19) 评论(0) 推荐(0) 编辑

LeetCode 72 Edit Distance DP

摘要： Given two strings word1 and word2, return the minimum number of operations required to convert word1 to word2. You have the following three operations 阅读全文

posted @ 2022-05-10 20:40 Blackzxy 阅读(11) 评论(0) 推荐(0) 编辑

Deep Learning Week5 Notes

摘要： 1. Cross-Entropy Loss \(\textbf{MSE }\text{is justified in Euclidean space. But there is no sense in the classification context, because the class val 阅读全文

posted @ 2022-05-10 18:20 Blackzxy 阅读(20) 评论(0) 推荐(0) 编辑

LeetCode 91 Decode Ways DP

摘要： A message containing letters from A-Z can be encoded into numbers using the following mapping: 'A' → "1" 'B' → "2" ... 'Z' → "26" To decode an encoded 阅读全文

posted @ 2022-05-10 05:06 Blackzxy 阅读(14) 评论(0) 推荐(0) 编辑

LeetCode 64 Minimum Path Sum DP

摘要： Given a m x n grid filled with non-negative numbers, find a path from top left to bottom right, which minimizes the sum of all numbers along its path. 阅读全文

posted @ 2022-05-09 03:54 Blackzxy 阅读(11) 评论(0) 推荐(0) 编辑

Deep Learning Week4 Notes

摘要： 1. DAG Networks $\text{If }(a_1,..,a_Q) = \phi(b_1,...,b_R),\text{ we use the notation:} $ \[ \begin{align} [\frac{\partial a}{\partial b}]&=J_{\phi}^ 阅读全文

posted @ 2022-05-07 21:06 Blackzxy 阅读(37) 评论(0) 推荐(0) 编辑

LibreOJ 10011 愤怒的牛二分

摘要：农夫约翰建造了一座有 $n$ 间牛舍的小屋，牛舍排在一条直线上，第 $i$ 间牛舍在 $x_i$ 的位置，但是约翰的 $m$ 头牛对小屋很不满意，因此经常互相攻击。约翰为了防止牛之间互相伤害，因此决定把每头牛都放在离其它牛尽可能远的牛舍。也就是要最大化最近的两头牛之间的距离。牛们并阅读全文

posted @ 2022-05-07 02:41 Blackzxy 阅读(28) 评论(0) 推荐(0) 编辑

LiberOJ 10014 数列分段 II 二分

摘要：题意给定长度为 $N$ 的序列 $A$，要将其划分为连续的 $M$ 段，并最小化每一段总和的最大值。输入格式第1行包含两个正整数 $N,M$ 第2行包含 $N$ 个空格隔开的非负整数 $A_i$，含义如题目所述。输出格式仅包含一个正整数，即每段和最大值最小为多少。阅读全文

posted @ 2022-05-06 04:32 Blackzxy 阅读(22) 评论(0) 推荐(0) 编辑

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