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c++ sort a 2d vector by column

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Adorable Angelfish answered on October 31, 2021 Popularity 8/10 Helpfulness 2/10

answer c++ sort a 2d vector by column

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c++ sort a 2d vector by column

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// 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 c++

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Contributed on Jul 24 2022

Adorable Angelfish

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

sort 2d vector c++

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-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 2d-v

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Contributed on Oct 31 2021

Helpless Hamerkop

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

c++ sort a 2d vector by column

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