вектор

#include <iostream>
#include <vector>
#include <cmath>
#include <functional>
#include <algorithm>
#include <random>
#include <numeric>
using namespace std;

double myfunction (double x, double y) {return x+ y*y;} // складывает квадраты элементов вектора

double myfunction1 (double x, double y) {return x + abs (y);} // для оператора <

bool comp (vector <double> a, vector <double> b) // сравнивает евклидову норму векторов
{
    return accumulate(a.begin(), a.end(), 0, myfunction) < accumulate(b.begin(),b.end(), 0, myfunction);
}

bool operator< (vector <double> a, vector <double> b)
{
    return accumulate(a.begin(), a.end(), 0, myfunction1) < accumulate(b.begin(),b.end(), 0, myfunction1);
}

int main() {

    vector <vector <double>> a (5, vector <double> (5));
    cout <<"vvedite diapazon"<<endl;
    int b;
    cin >>b;
    for (int i=0; i<5; i++)
    {
        for (int j=0; j<5; j++)
        {
            a[i][j] = rand () % (2*b +1) - b;
        }
    }
    for (int i=0; i<5; i++)
    {
        for (int j=0; j<5; j++)
        {
            cout << a[i][j]<< " ";
        }
        cout << endl;
    }


    /*double x = *min_element(a[0].begin(),a[0].end() );
    double y = *max_element (a[0].begin(),a[0].end());
    for (int i=1; i<5;i++)
    {
        if (x > *min_element(a[i].begin(),a[i].end()))
            x = *min_element(a[i].begin(),a[i].end());
        if (y < *max_element (a[i].begin(),a[i].end()))
            y = *max_element (a[i].begin(),a[i].end());
    }
    cout << y - x <<endl;*/


    /*for (int i=0; i<2; i++)
    {
        for (int j=0; j<5; j++)
        {
            cout << a[i][j]<< " ";
        }
        cout << endl;
    }
    if (a[0]<a[1])
        cout << "yes"<<endl;
    else cout << "no"<<endl;*/


    /*sort (a.begin(),a.end(),comp);
    for (int i=0; i<5; i++)
    {
        for (int j=0; j<5; j++)
        {
            cout << a[i][j]<< " ";
        }
        cout << endl;
    }*/


    vector <vector <double> > c = a;
    for (int i=0;i<5;i++)
    {
        auto x = sqrt (accumulate (a[i].begin(),a[i].end(),0,myfunction));
        cout << x << endl;
        transform (a[i].begin(),a[i].end(),c[i].begin(), [&x](double y){return y/x;} );
    }
    for (int i=0; i<5; i++)
    {
        for (int j=0; j<5; j++)
        {
            cout << c[i][j]<< " ";
        }
        cout << endl;
    }
    cout << accumulate(c[0].begin(), c[0].end(), 0.0, myfunction) << endl;
    return 0;
}