next_permutation and prev_permutation are two very useful functions in STL, so today we will talk about the use of these two functions. Usage of next_permutation next_permutation: Find the next full permutation of the sequence. prev_permutation: Find the previous full permutation of the sequence. For example: Now there is a sequence 1,2,3,4 Its full arrangement is […]
Tag: permutation
C. Yet Another Permutation Problem (Codeforces Round 893 (Div. 2))
Alex got a new game called “GCD permutations” as a birthday present. Each round of this game proceeds as follows: First, Alex chooses a permutation ? ^{\dagger} ? a 1 , a 2 , … , a n a_1, a_2, \ldots, a_n a1?,a2?,…,an? of integers from 1 1 1 to n n n. Then, for […]
Recursive implementation Combination problem + permutation problem (DFS)
Directory Recursive implementation of permutation enumeration Recursive implementation of permutation type enums II Recursive implementation of composite enumeration Implementing Composite Enums Recursively II Recursive implementation of exponential enumeration Recursive Implementation of Exponential Enumeration II Recursion is not a loop, recursion uses the system stack, as long as it is a function, it will be managed […]
Atcoder [ARC159C] Permutation Addition
Link to topic Atcoder direction Luogu direction Problem solution First consider whether there is a feasible solution Consider from the direction of the sum of numbers Eventually each number is the same, then the s u m sum sum must be no no multiple of n At the same time, each sequence will be added […]
chatgpt enables python: Python calculates the number of permutations and combinations
Python calculates the number of permutations Introduction Python is an easy-to-learn programming language that can be used in a variety of fields, including scientific computing and data analysis. Among them, the number of permutations and combinations is a common problem. In permutations and combinations, we need to calculate the different permutations and combinations of a […]
Structure0603 Lucky Permutation
Question: Given a length of no no permutation of n p p p, for 1 ≤ i < j ≤ no 1\leq i3->4->1, exchange 1 1 1 and 2 2 2 The exchange is as follows: 2 1 3 4 5 6 7 8 2 3 4 1 5 6 7 8 2->2 1->3->4->1 After […]
Detailed analysis of the permutation algorithm
For the operating system, the virtual space is very large, and we often cannot directly load such a large space into the memory, and even if we use multi-level page tables and segmented page storage, it only saves the size of the page table , so how many physical pages will be loaded into the […]
Classic problems of divide and conquer – quick sort, merge sort, full permutation, binary search, finding the kth largest element
1. Overview of Divide and Conquer 1. Design thinking 2. The problems that can be solved by divide and conquer generally have the following characteristics 3. Solving steps 2. Classic algorithm 1. Quick Sort 2. Merge sort 3. Full arrangement 4. Binary search 5. Find the kth largest element 1. Overview of divide and conquer […]
The backtracking algorithm spikes all permutations-combinations-subset problems
Document reading document reading Form 1, the elements are non-repeatable and cannot be reselected, that is, the elements in nums are unique, and each element can only be used once at most, which is also the most basic form. No repetition is guaranteed by the selection of the for loop, and no multiple selection is […]
Cryptography homework – permutation cipher part
part1: encrypt encryption function_ code supplement: /*Please add here*/ cout<<Substition[plain[i]]; part2: Decrypt decryption function_code supplement: /*Please add code here*/ cout<<ReverseTable[cipher[i]]; part3: Set the conversion table Substition[] part: // Set the substitution table element corresponding to i to the character at the corresponding position in s1 /* Please add code here */ SubstitionTable[i] = s1[i-‘a’] ; […]