Access elements in matrix when it is called from a function

[elieli eli]

Write your question here.
Hi, I am having problems with this line
for (int &vecino: lista_vecinos[hormiga]). I want to go ever each element in "hormiga" column from lista_vecinos.

Here is my code.

#include <iostream>
#include<iomanip>
#include<stdio.h>
#include <fstream>
#include<stdlib.h>
#include <math.h> 
#include<time.h>  // libreria para el uso de time() 
#include <random>  
using namespace std;


 int n=30; //número de nodos o ciudades
 
 int** vecinos(int, int){
    int** lista_vecinos = new int*[n];
    for(int i = 0; i < n; i++) {
        lista_vecinos[i] = new int[n]; 
        for(int j = 0; j < n; j++){ lista_vecinos[i][j] = (j); }
    }
    return lista_vecinos;
    }
    
    
int main()
{  int** lista_vecinos = vecinos(n,n);//Call function
	
	for  (int &vecino: lista_vecinos[hormiga]) //For each element in row "hormiga" from LIsta_vecinos
		      	     {r1+=probabilidad_acumulada[hormiga][vecino]= r1;
					 }
}
return 0;

Thank you

[keskiverto]

The range-based for cannot know the actual size of the array that the pointer lista_vecinos[hormiga] points to.
See http://stackoverflow.com/questions/15904896/range-based-for-loop-on-a-dynamic-array