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order 2d array in c++

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Cooperative Cobra answered on October 31, 2021 Popularity 9/10 Helpfulness 1/10

answer order 2d array in c++

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order 2d array in c++

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-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 c++

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Contributed on Mar 21 2022

Cooperative Cobra

0 Answers Avg Quality 2/10

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how to sort a 2d array in c++

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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

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 2d-v

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Contributed on Oct 31 2021

Helpless Hamerkop

0 Answers Avg Quality 2/10

sort 2d array

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function sort_array() {
  
notice_board_data.sort(function (a, b) {
    return Date.parse(a[0].localeCompare(b[0])) || a[1].localeCompare(b[1]);
});

}//end function

Popularity 9/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: 2d 2

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Contributed on Aug 13 2022

Poor Polecat

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

order 2d array in c++

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