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sort 2d vector c++

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Helpless Hamerkop answered on October 31, 2021 Popularity 10/10 Helpfulness 2/10

answer sort 2d vector c++

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sort 2d vector c++

Comment

-1

std::sort(vector1.begin(),
          vector1.end(),
          [] (const std::vector<double> &a, const std::vector<double> &b)
          {
              return a[3] < b[3];
          });

Popularity 10/10 Helpfulness 2/10 Language cpp

Source: stackoverflow.com

Tags: 2d-vector c++

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Contributed on Oct 31 2021

Helpless Hamerkop

0 Answers Avg Quality 2/10

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sort a 2d vector c++ stl

Comment

// C++ code to demonstrate sorting of a
// 2D vector on basis of a column
#include <algorithm> // for sort()
#include <iostream>
#include <vector> // for 2D vector
using namespace std;
 
// Driver function to sort the 2D vector
// on basis of a particular column
bool sortcol(const vector<int>& v1, const vector<int>& v2)
{
    return v1[1] < v2[1];
}
 
// Driver Code
int main()
{
    // Initializing 2D vector "vect" with
    // values
    vector<vector<int> > vect{ { 3, 5, 1 },
                               { 4, 8, 6 },
                               { 7, 2, 9 } };
 
    // Number of rows;
    int m = vect.size();
 
    // Number of columns (Assuming all rows
    // are of same size). We can have different
    // sizes though (like Java).
    int n = vect[0].size();
 
    // Displaying the 2D vector before sorting
    cout << "The Matrix before sorting is:\n";
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++)
            cout << vect[i][j] << " ";
        cout << endl;
    }
 
    // Use of "sort()" for sorting on basis
    // of 2nd column
    sort(vect.begin(), vect.end(), sortcol);
 
    // Displaying the 2D vector after sorting
    cout << "The Matrix after sorting is:\n";
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++)
            cout << vect[i][j] << " ";
        cout << endl;
    }
    return 0;
}

Popularity 9/10 Helpfulness 5/10 Language cpp

Source: www.geeksforgeeks.org

Tags: 2d-vector 2d-v

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Contributed on Apr 30 2022

Kiran

0 Answers Avg Quality 2/10

how to sort a 2d array in c++

Comment

bool sortcol(const vector<int>& v1, const vector<int>& v2)
{
    return v1[1] < v2[1];
}
sort(vect.begin(), vect.end(), sortcol);

Popularity 10/10 Helpfulness 5/10 Language cpp

Source: Grepper

Tags: 2d 2

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Contributed on Aug 09 2022

Kiran

0 Answers Avg Quality 2/10

c++ sort a 2d vector by column

Comment

// C++ code to demonstrate sorting of a
// row of 2D vector
#include <algorithm> // for sort()
#include <iostream>
#include <vector> // for 2D vector
using namespace std;
 
// Driver Code
int main()
{
    // Initializing 2D vector "vect" with
    // values
    vector<vector<int> > vect{ { 3, 5, 1 },
                               { 4, 8, 6 },
                               { 7, 2, 9 } };
    // Number of rows;
    int m = vect.size();
 
    // Number of columns (Assuming all rows
    // are of same size). We can have different
    // sizes though (like Java).
    int n = vect[0].size();
 
    // Displaying the 2D vector before sorting
    cout << "The Matrix before sorting 1st row is:\n";
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++)
            cout << vect[i][j] << " ";
        cout << endl;
    }
 
    // Use of "sort()" for sorting first row
    sort(vect[1].begin(), vect[1].end());
 
    // Displaying the 2D vector after sorting
    cout << "The Matrix after sorting 1st row is:\n";
    for (int i = 0; i < m; i++) {
        for (int j = 0; j < n; j++)
            cout << vect[i][j] << " ";
        cout << endl;
    }
 
    return 0;
}

Popularity 8/10 Helpfulness 2/10 Language cpp

Source: www.geeksforgeeks.org

Tags: 2d-vector 2d-v

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Contributed on Jul 24 2022

Adorable Angelfish

0 Answers Avg Quality 2/10

c++ sort a 2d vector by column

Comment

The Matrix before sorting 1st row is:
3 5 1 
4 8 6 
7 2 9 
The Matrix after sorting 1st row is:
1 3 5 
4 8 6 
7 2 9

Popularity 8/10 Helpfulness 1/10 Language cpp

Source: www.geeksforgeeks.org

Tags: 2d-vector 2d-v

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Contributed on Jul 24 2022

Adorable Angelfish

0 Answers Avg Quality 2/10

order 2d array in c++

Comment

-1

9

The built-in arrays of C and C++ are very inflexible, among other things they cannot be assigned.

Your best option would be the 'array' class from the C++ standard library, at least for the inner dimension:

array<int, 2> a[5] = { { 20, 11 },
{ 10, 20 },
{ 39, 14 },
{ 29, 15 },
{ 22, 23 } };

sort( a, a + 5 );
Edit: Some more explanations.
Here we use the property of std::array that '<' by default compares them lexicographically, i.e. starts with the first element. In order to sort things differently we have to come up with an comparator object, so if you want to use the second column as sort key you have to do this:

auto comp = []( const array<int, 2>& u, const array<int, 2>& v )
      { return u[1] < v[1]; };
sort( a, a + 5, comp );
And as mentioned in the first comment, sort(a, a+5 ... is just an ugly short form for the cleaner sort(std::begin(a), std::end(a) ...

Popularity 9/10 Helpfulness 1/10 Language cpp

Source: stackoverflow.com

Tags: 2d 2

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Contributed on Mar 21 2022

Cooperative Cobra

0 Answers Avg Quality 2/10

c++ 2D array sort

Comment

// sorting the o/p columnwise the first column
bool sortcol(const vector<int>& v1, const vector<int>& v2)
{   
    cout<<v1[0]<<" "<<v2[0]<<endl;
    return v1[0] < v2[0];
}
sort(vect.begin(), vect.end(), sortcol);

Popularity 7/10 Helpfulness 1/10 Language cpp

Source: Grepper

Tags: 2d c++

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Contributed on Jun 16 2023

Mridu Pawan

0 Answers Avg Quality 2/10

sort 2d vector c++

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