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1. Top results related to how to sort a vector in c++?

   • How to Sort a Vector in a Map in C++?

     In C++, we can create a map container where the values associated with keys is a vector. In this article, we will learn how to sort a vector within a map in C++.

     Example

     Output:

     Input:myMap = { {3, {9, 7, 3}}, {5, {4, 2, 8, 1, 6}}, {8, {1, 2, 5, 8}} };Output: Map:Key: 3, Sorted Vector: [3 7 9 ]Key: 5, Sorted Vector: [1 2 4 6 8 ]Key: 8, Sorted Vector: [1 2 5 8 ]

     Sort Vector in Map of Vectors in C++

     To sort vectors in a map of vectors, we can directly use the std::sort() algorithm. We first iterator over the map to access each pair. In each pair, we go to the second element (which is vector) and then apply the sort algorithm on it using its iterators. We keep doing it till we reach the end of the map.

     C++ Program to Sort Vector in Map

     C++

     // C++ Program to Sort Vectors Inside a Map   #include <algorithm> #include <iostream> #include <map> #include <vector> using namespace std;   int main() { Declare a map with...

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   • How to sort a vector using sort() in c++

     Top Answer

     Answered Jun 07, 2017 · 3 votes

     std::sort(g1.begin(), g1.end());-

     Should do the trick.

     Alternatively, if you want to be able to switch out the vectorness of g1 with, say, a plain array, without having to modify this code, or if this was in template code where you want to work with multiple container types, then the form

     std::sort(std::begin(g1), std::end(g1));-

     may hold more appeal.

     In any case; Please, do read the documentation.

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     2/5

   • how to sort a vector in c++ according to the ratio of its values

     Top Answer

     Answered Mar 19, 2014 · 8 votes

     Have a look at std::sort

     . That function allows you to sort a collection using a predicate that you may specify yourself. In the example code below I create a vector of pairs. The cmp function compares two of these pairs by calculating the ratio for each and returning true if a's ratio is greater than b's.

     So effectively you need to specify a function (or a function object, or lambda or whatever) that takes two arguments of your collections element-type and compares them. If a should come before b, then the function should return true, and if not then it should return false. That function is the third argument for std::sort

     #include <algorithm>#include <vector>bool cmp(const std::pair<int, int>& a, const std::pair<int, int>& b){ // you should probably also add some code to prevent dividing by zero... return (static_cast<double>(a.first)/a.second) > (static_cast<double>(b.first)/b.second);}int main(){ std::vector<std::pair<int, int> > pairs; std::sort(pairs.begin(), pairs.end(), &cmp);}

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   • How to sort a Vector in descending order using STL in C++?

     Given a vector, sort this vector in descending order using STL in C++.

     Example:

     Input: vec = {1, 45, 54, 71, 76, 12}Output: {76, 71, 54, 45, 12, 1}Input: vec = {1, 7, 5, 4, 6, 12}Output: {12, 7, 6, 5, 4, 1}

     Approach: Sorting can be done with the help of sort() function provided in STL.

     Syntax 1:

     sort(arr, arr + n, greater<T>());

     C++

     // C++ program to sort Vector// in descending order// using sort() in STL #include <bits/stdc++.h>using namespace std; int main(){    // Get the vector    vector<int> a = { 1, 45, 54, 71, 76, 12 };     // Print the vector    cout << "Vector: ";    for (int i = 0; i < a.size(); i++)        cout << a[i] << " ";    cout << endl;     // Sort the vector in descending order    sort(a.begin(), a.end(), greater<int>());     // Print the reversed vector    cout << "Sorted Vector in descending order:\n";    for (int i = 0; i < a.size(); i++)        cout << a[i] << " ";    cout << endl;     return 0;}

     Output

     Vector: 1 45 54 71 76 12 Sorted Vector in...

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   • How to sort a Vector in descending order using STL in C++?

     Given a vector, sort this vector in descending order using STL in C++.

     Example:

     Input: vec = {1, 45, 54, 71, 76, 12}Output: {76, 71, 54, 45, 12, 1}Input: vec = {1, 7, 5, 4, 6, 12}Output: {12, 7, 6, 5, 4, 1}

     Approach: Sorting can be done with the help of sort() function provided in STL.

     Syntax 1:

     sort(arr, arr + n, greater<T>());

     C++

     // C++ program to sort Vector// in descending order// using sort() in STL #include <bits/stdc++.h>using namespace std; int main(){    // Get the vector    vector<int> a = { 1, 45, 54, 71, 76, 12 };     // Print the vector    cout << "Vector: ";    for (int i = 0; i < a.size(); i++)        cout << a[i] << " ";    cout << endl;     // Sort the vector in descending order    sort(a.begin(), a.end(), greater<int>());     // Print the reversed vector    cout << "Sorted Vector in descending order:\n";    for (int i = 0; i < a.size(); i++)        cout << a[i] << " ";    cout << endl;     return 0;}

     Output

     Vector: 1 45 54 71 76 12 Sorted Vector in...

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2. www.geeksforgeeks.org · sorting-a-vector-in-cSorting a vector in C++ - GeeksforGeeks

   www.geeksforgeeks.org · sorting-a-vector-in-c

   

   Jan 11, 2023 · In C++, std::vector::size() and std::vector::empty() are the member functions of STL vector container. They are used provide the vector's size information. In this article, we will learn how to use vector::empty() and vector::size() in C++.

   • STD

     std::sort() is an STL function that is used to sort the...

   • Set 2

     Output: The Matrix before sorting 1st row is: 3 5 1 4 8 6 7...

3. stackoverflow.com · questions · 2758080c++ - How to sort an STL vector? - Stack Overflow

   stackoverflow.com · questions · 2758080

   

   Aug 9, 2017 · For example, you can pass a lambda: std::sort(object.begin(), object.end(), [] (myclass const& a, myclass const& b) { return a.v < b.v; }); Or if you're stuck with C++03, the function object approach (v is the member on which you want to sort): struct pred {.

4. favtutor.com · blogs · sort-vector-cppSort Vector in C++: Ascending & Descending Order (with code)

   favtutor.com · blogs · sort-vector-cpp

   

   • What Is Sorting?
   • Sort Function in C++
   • How to Sort A Vector in C++?
   • Which Algorithm Is Used in Std:Sort() function?
   • Takeaways

   Sorting means arranging elements of an array in a specified order. This can be from lowest to highest (ascending) or highest to lowest (descending). This makes working with this data type in the manner that we want. All human data is stored in some form where it can be highly unorganized. Sorting is simply a way to organize it. Every programmer mus...

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   The Standard Template Library provides us with an in-build sort function. The std:sort() function available in C++ STL allows us to sort the vector in ascending or descending order.It is defined in the algorithms header file. It can also be used to sort any data structure in whatever order is required. The basic syntaxof this function is: The class...

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   There are different ways to sort a vector in C++ we will discuss in detail each of them. 1. Ascending Order 2. Descending Order 3. Custom comparison function 3.1. How to sort in a particular order? 3.2. How to sort the array in descending order based on some parameter using a comparator function? 4. Using lambda to sort 5. 2D Matrix 5.1. sort a spe...

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   The sort() function defined in the header file uses the introsort algorithm which is a hybrid algorithm.Why is it so? Because it is a hybrid of quick sort, heap sort, and insertion sort. So, when the recursion depth exceeds a level based on (the logarithm of) the number of elements being sorted it switches from quicksort() to heapsort()and when the...

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   As a programmer, you will encounter many problems in which you will be dealing with some data manipulations,and in between, you require the data to be sorted in some order, this sort()function can make your job easier. Now you know how to sort vectors in C++ with examples and code.

   See full list on favtutor.com

   • Author: Anubhav Agarwal

5. www.geeksforgeeks.org · sort-vector-in-ascendingHow to Sort Vector in Ascending Order in C++? - GeeksforGeeks

   www.geeksforgeeks.org · sort-vector-in-ascending

   

   Feb 5, 2024 · Sort a Vector in Ascending Order in C++. In C++, we can easily and efficiently sort the elements of the vector using the std::sort () method provided by the algorithm library of STL. We have to provide the iterator to the start and end of the vector.

6. www.digitalocean.com · community · tutorialsSorting a Vector in C++ - DigitalOcean

   www.digitalocean.com · community · tutorials

   

   Aug 3, 2022 · A vector in C++ can be easily sorted in ascending order using the sort() function defined in the algorithm header file. The sort() function sorts a given data structure and does not return anything. The sorting takes place between the two passed iterators or positions.

7. www.geeksforgeeks.org · sort-c-stlstd::sort() in C++ STL - GeeksforGeeks

   www.geeksforgeeks.org · sort-c-stl

   

   Sep 6, 2024 · std::sort() is an STL function that is used to sort the given range in desired order. It provides a simple and efficient way to sort the data in C++ but it only works on data structure which have random access to its elements such as vectors and arrays. It is defined inside <algorithm> header file. Syntax std::sort (first, last, comp); Parameters

8. People also ask

   How to sort a vector in C++?

   • Since C++20, you can leverage std::ranges::sort to sort via a member of the object quite easily. For the standard sort using a less-than comparison, it looks like: If you want to use the greater-than operator, you just change it to: To sort a vector you can use the sort () algorithm in .

   c++ - How do I sort a vector of custom objects? - Stack Overflow

   stackoverflow.com/questions/1380463/how-do-i-sort-a-vector-of-custom-objects

   See all results for this question

   How to sort in descending order in C++?

   • Prerequisites : std::sort in C++, vector in C++, initialize a vector in C++. // order. How to sort in descending order? sort () takes a third parameter that is used to specify the order in which elements are to be sorted. We can pass “greater ()” function to sort in descending order.

   Sorting a vector in C++ - GeeksforGeeks

   www.geeksforgeeks.org/sorting-a-vector-in-c/

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   How can I sort my vector on a specific data variable?

   • How can I sort my vector on any specific data variable of myClass. where, pred() is a function object defining the order on objects of myclass. Alternatively, you can define myclass::operator<. For example, you can pass a lambda: (myclass const& a, myclass const& b) { return a.v < b.v; });

   c++ - How to sort an STL vector? - Stack Overflow

   stackoverflow.com/questions/2758080/how-to-sort-an-stl-vector

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   How do I sort a std vector containing custom objects?

   • How does one go about sorting a std::vector containing custom (i.e. user-defined) objects? Probably, you can use the standard library algorithm std::sort along with a predicate (a function or a function object) which would operate on one of the data members (as a key for sorting) in the custom object.

   c++ - How do I sort a vector of custom objects? - Stack Overflow

   stackoverflow.com/questions/1380463/how-do-i-sort-a-vector-of-custom-objects

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9. cplusplus.com · articles · NhA0RXSzBeginners guide to the std::sort () funct - C++ Articles

   cplusplus.com · articles · NhA0RXSz

   

   May 6, 2013 · It's use is to sort containers like arrays and vectors. The first example is what the function looks like. The second example is an optional overloaded function that includes a third parameter. First take a look at each of these functions and see if we can figure out what each parameter does.