John Doe has found the beautiful permutation formula. Let's take permutation p = p1, p2, ..., pn. Let's define transformation f of this permutation: where k (k > 1) is an integer, the transformation parameter, r is such maximum integer that rk ≤ n. I…

Google : Op-Amp Level Shifter Level shifting a +/- 2.5V signal to 0 - 5V I have a front end module that generates an (ECG) signal that varies from +/-2.5 V. I want to shift this signal to 0 - 5V. What is the best way to do this? First thing to try is…

We have a string S of lowercase letters, and an integer array shifts. Call the shift of a letter, the next letter in the alphabet, (wrapping around so that 'z' becomes 'a'). For example, shift('a') = 'b', shift('t') = 'u', and shift('z') = 'a'. Now f…

We have a string S of lowercase letters, and an integer array shifts. Call the shift of a letter, the next letter in the alphabet, (wrapping around so that 'z' becomes 'a'). For example, shift('a') = 'b', shift('t') = 'u', and shift('z') = 'a'. Now f…

Shifting 感觉这题被智力打击了.. 刚开始我想的是对于每个位置我们可以暴力找出最后的位置在哪里. 因为对于当前位置p, 在进行第x步操作时, 如果p % x == 1 则 p = p + x - 1 否则                       p = p - 1 并且第一步只有nlogn次, 所以我们可以暴力找出p % x == 1的情况, 然后更新, 然后就被卡常惹.. 主要是存因子要2s钟, 卡常卡一辈子卡不过去. 其实我们发现每一步操作只有两种点, 一种p = p - 1,…

http://www.faludi.com/bwsn/xbee-level-shifting/ The XBee communication (RX/TX) pins definitely operate off of a 5V signal with the Arduino. We’ve seen this a lot and done this a lot, and it certainly keeps things simple. That said, there’s nothing wr…

原题链接在这里:https://leetcode.com/problems/shifting-letters/ 题目: We have a string S of lowercase letters, and an integer array shifts. Call the shift of a letter, the next letter in the alphabet, (wrapping around so that 'z' becomes 'a'). For example, shi…

848. Shifting Letters 题目链接:https://leetcode.com/problems/shifting-letters/description/ 思路:O(N^2)复杂度过不了:先处理shifts, 从尾到头执行shifts[i] = sum(shifts[i+1]+...+shifts[n-1]). 注意点:会爆int,及时取余或用longlong. 1 string shiftingLetters(string S, vector<int>& shift…

<Learning to warm up cold Item Embeddings for Cold-start Recommendation with Meta Scaling and Shifting Networks>论文阅读 (i)问题背景: 工业界的推荐系统/广告系统现在都会用embedding技术生成物品/用户的向量.通俗点讲就是build一个向量嵌入层,把带有原始特征的输入向量转换成一个低维度的dense向量表示.推荐系统的模型一般有向量嵌入层和深度模型层两部分组成,向量嵌入层的…

[LeetCode]848. Shifting Letters 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.me/ 题目地址:https://leetcode.com/problems/shifting-letters/description/ 题目描述: We have a string S of lowercase letters, and an integer arr…