Please help | read matrix travelling salesman problem

[Ingek]

We are working on the travelling salesman problem in c++ for school, but we cannot figure out how to read the file we have to implement.
This is our txt file:

5
2 4 8 3
4 1 3
7 3
9

Where 5 is the number of cities and 2 is the distance between city 0 and 1, 4 between 0 and 2, 8 between 0 and 3 and 3 between 0 and 4 etcetera. We would like to make it a matrix like this:

0 2 4 8 3
2 0 4 1 3
4 4 0 7 3
8 1 7 0 9
3 3 3 9 0

We're working on it for hours now and we still can't figure out how to read this data from the file.. Could someone help us?

[Mats]

When you say 'we would like to make a matrix like this'. What do the values in the second matrix represent? Can you perhaps explain the question better / in a different way? It might not be your fault... I'm feeling a bit slow today, but I do believe I can help you, if I can only know what answer you're looking for... lol

[Ingek]

The second matrix represents the distances between the cities:

0 2 4 8 3
2 0 4 1 3
4 4 0 7 3
8 1 7 0 9
3 3 3 9 0

Where the first row are the distances between city 0 and city 0 (which of course is zero), 1,2,3 and 4 (there are 5 cities, city 0, 1,2,3 and 4) .
Then the second row are the distances between city 1 and city 0,1,2,3 and 4
etc.

[Ingek]

And we have to generate this matrix from the txt file:

5
2 4 8 3
4 1 3
7 3
9

Where the number 5 represents the total number of cities and the other numbers are numbers in the second matrix, which I made bold.
Btw we have to do this for different numbers of cities, so it should be a general program for n cities..

[Mats]

hmm so all you need to do is:

-Place zeros down the diagonal (distance from city 0 to city 0).
-Redraw each horizontal row vertically.

You can do this with a 2d array easily.

4
2 4 8
42
7

0 2 4 8
2 0 4 2
4 4 0 2
8 2 2 0

int array[4][4]; //Fill with zeros on empty slots and place numbers appropriately
//To obtain
/*
0 2 4 8 
0 0 4 2
0 0 0 2
0 0 0 0
*/
Then make each diagonally opposite number equal. For example: 
array[1][0] = array[0][1]; //Will do this... 
/*
0 2 4 8 
2 0 4 2
0 0 0 2
0 0 0 0*/