Article directory tuple Tuple creation and deletion The difference between tuples and lists Sequence unpacking generator expression dictionary Dictionary creation and deletion Reading dictionary elements Adding, modifying and deleting dictionary elements dictionary comprehension gather Collection creation and deletion Adding and deleting collection elements Set operations A sequence is a memory space used to store multiple […]
Tag: sequences
Number of Rigorous SubsequencesNumber of combinations
Description We claim a sequence Z is rigorous if it consists of one or more ‘2’,and then one or more ‘1’, and then one or more ‘0’. For example,[2,2 ,2,1,0,0] and [2,1,0] are both rigorous, while [1,2], [1,2,0], and [1,1,0] are not. In this question, given a integer sequence X including only 0,1,2, you are […]
Application of C++ prefix sum algorithm: principles, source code and test cases of effective arrangement of DI sequences
Basic knowledge points involved in this article C++ algorithm: principles, source code and test cases of prefix sum, prefix product, prefix XOR including course videos Title Given a string s of length n, where s[i] is: “D” means decrease, or “I” means increase A valid permutation is a perm of n + 1 integers in […]
2023NOIP A layer joint testing 10 sub-sequences
The main idea of the title Given a length of n n A string consisting only of lowercase letters for n S S S. We define a string to be good if and only if it can use two different letters x x x and y y y is expressed as x y x y […]
Explore the concept of limits of sequences and functions with Python
1. Limit of sequence A sequence of numbers is naturally understood as a sequence of numbers, but this sequence of numbers generally follows a pattern. The problem of finding patterns and filling in numbers that is often done in elementary school is actually to find patterns for a sequence and fill in the blank items […]
C++ algorithm: using topological sorting to solve stamp sequences
Title You want to use lowercase letters to form a target string target. Initially, the sequence consists of target.length ?’ tokens. And you have a lower case stamp. On each turn, you place the seal on the sequence and replace each letter in the sequence with the corresponding letter on the seal. You can take […]
513. Find the value in the lower left corner of the tree 112. Sum of paths 106. Construct a binary tree from mid-order and post-order traversal sequences
513. Find the value in the lower left corner of the tree Likou question link(opens new window) Given a binary tree, find the leftmost value in the last row of the tree. class Solution { public: int maxDepth = INT_MIN; int result; void traversal(TreeNode* root, int depth) { if (root->left == NULL & amp; & […]
Binary tree: 513. Find the value in the lower left corner of the tree, 112. Sum of paths, 106. Construct a binary tree from mid-order and post-order traversal sequences
Tips: Live hard and have a happy day Article directory 513. Find the value in the lower left corner of the tree Problem-solving ideas Problems encountered Code Summary of the question 112. Path sum Problem-solving ideas Problems encountered Code Summary of the question 106. Construct a binary tree from inorder and postorder traversal sequences Problem-solving […]
[C++ code] Valid parentheses, deletion of all adjacent duplicates in a string, evaluation of reverse Polish expressions, push and pop sequences on the stack – Code Random Notes
Topic: Valid parentheses Given a sequence containing only ‘(‘, ‘)’, ‘{‘, ‘} ‘, ‘[‘, ‘]’ string s to determine whether the string is valid. A valid string must satisfy: The opening bracket must be closed by a closing bracket of the same type. Opening brackets must be closed in the correct order. Every right bracket […]
08_ansible, loops, standard loops, nested loops, use for hash tables, use loops for lists of files, use loops for parallel datasets, use loops for subelements, use loops for sequences of integers, random selection, Do-Until loops, Find the first matching file
11. Loop 11.1. Standard cycle 11.2. Nested loops 11.3. Using hash tables 11.4. Using loops on file lists 11.5. Using loops with parallel datasets 11.6. Using loops on child elements 11.7. Using loops on sequences of integers 11.8. Random selection 11.9. Do-Until loop 11.10. Finding the first matching file 11.11. Execution results of iterative programs […]