Programmer Think

1, Question 6: classified counting (15 points) (1) Title Description Input a string, please output how many uppercase letters, lowercase letters and numbers the string contains. [input format] The input line contains a string. [output format] Output three lines, one integer per line, representing the number of uppercase letters, lowercase let ...

📚 Blog home page: ⭐ This is a little Yibai blog duck~ ⭐ ️👉 Welcome to pay attention ❤️ give the thumbs-up 👍 Collection ⭐ Comments 📝😜 Xiaoyibai is preparing for his internship. He often updates the interview questions and LeetCode solutions. Friends with similar interests are welcome to communicate with each other~ 💙 If you have any ...

4.2. Implementation of circular queue function Cyclic queue characteristics In order to make full use of vector space and overcome the phenomenon of "false overflow", the method is to imagine vector space as a ring with head and tail connected, and call this vector cyclic vector. The queue stored in it is called Circular Queue. C ...

Given a variable pair array equations and a real value array values as known conditions, where equations[i] = [Ai, Bi] and values[i] jointly represent the equation Ai / Bi = values[i]. Each Ai or Bi is a string representing a single variable. There are also some problems represented by array queries, where queries[j] = [Cj, Dj] represents the ...

This is a very good shortest path + deep search exercise Question surface: Copy heard from Lu Niu that there are many treasures buried in a god field called yz, so copy came to this God land divided into regions. Lu Niu told me that there are treasures here, which are placed in the PI (1 < = Pi < = n) area. Copy also knows the distance ...

Efficiency problems in some scenarios of C + + standard library In the following scenario, the C + + standard library is unordered_map,map,multiset,unordered_multiset is not efficient. Group repetition count There are 100 million records with two columns: group_id, attribute, and the record has been recorded according to group_id is in order ...

In the previous section, we have learned about continuous storage in linear storage. We also call this storage structure sequential table or array. We also know that linear continuous storage has the following advantages and disadvantages: Advantages: it can quickly add and access elementsDisadvantages: inserting or deleting elements will mo ...

Prefix and array Learn from Small and beautiful algorithm skills: prefix and array 303. Region and retrieval - array immutable 304. Two dimensional area and retrieval - the matrix is immutable 560. Subarray with sum K 1314. Matrix areas and The key to distinguish between prefix and sliding window is whether the element has a negative number ...

⭐ New pit in winter vacation -- daily question notes of code Fox 1688. Number of matches in the competition Give you an integer n to represent the number of teams in the game. The competition follows a unique competition system: If the current number of teams is even, each team will be paired with another team. A total of n / 2 games were ...

Original link: http://tecdat.cn/?p=18726 Original source: Tuo end data tribal official account_ Self organization_ Mapped neural network (SOM) is an unsupervised data visualization technology, which can be used to visualize high-dimensional data sets in low-dimensional (usually 2-dimensional) representation. In this article, we studied how to u ...