转眼间已经到了24岁，回想这一年发生的事情，我觉得可以用精彩和自洽来形容。在2024年2月份得知自己成功考上自己理想的大学院后，所有的担忧，压力一下烟消云散，即便后续还是有本科毕业论文的压力，但觉得那些和当时考验的压力相比真的不值一提，最后也是顺利通过了答辩。 在收拾宿舍的个人物品时，发现了用来放在衣柜里除臭的香薰包，从大一放到了大四，早已经失去了它最初的味道；当时在宜家买的原本小型电钻箱...

Problem description There are n dominoes in a line, and we place each domino vertically upright. In the beginning, we simultaneously push some of the dominoes either to the left or to the right. A...

Problem description Given two strings s and t, determine if they are isomorphic. Two strings s and t are isomorphic if the characters in s can be replaced to get t. All occurrences of a characte...

Problem description Leetcode 409 Given a string s which consists of lowercase or uppercase letters, return the length of the longest palindrome that can be built with those letters. Letters are ...

Problem description Leetcode 206 Given the head of a singly linked list, reverse the list, and return the reversed list. Example: Input: [1,2,3,4,5] Output: [5,4,3,2,1] Constrai...

Problem description Leetcode 67 Given two binary strings a and b, return their sum as a binary string. Example 1: Input: a = “11”, b = “1” Output: “100” Example 2: Input: a = “1010”, b...

前言 2025 年 4 月 11 日，我在 Preferred Networks（PFN）官网看到了 2025 年夏季实习的招募，并提交了 Entry Sheet（ES）。四月底收到 OA 通知，我用整个黄金周完成了它。OA 分两部分。第一部分是三道不限时算法题，第一题相对简单，大约 20 分钟就能 AC；后两题需要较强的数学功底与计算机系统基础，第二题涉及极大似然估计，第三题考查浮点数的进...

0. 前言 在5.24号的时候，赶在Exawizards（后面简称E社）的实习报名的deadline前一天提交了ES并成功通过了，申请的岗位是MLE（CV相关）。ES包含了介绍自己的为什么能够胜任这份工作，目前拥有的技能以及简单介绍一下自己的研究。提交完ES后还需要提交一份日语能力证明，我提交的是在大学闲暇时间考的N2证书。 1. Modify the string 在这一题中，你需要...

Problem description Leetcode 236 Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common an...

1. Introduction to Recommendation Systems There are many ways to describe recommendation systems. For me, I like to sum it up in one sentence: “If you’re here, you’re staying — one scroll leads t...