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This, essentially, is my algorithm:

Read data into a matrix (the data matrix)
Create another matrix (the sum matrix), the last column of which is copied from the data matrix
For each column (except the last) of the data matrix, starting from the last column:

For each element of that column ...

Did you get an email explaining the compiler errors?

Yes, that worked! Thank you!

But do you have any idea why the other way way wouldn't work? Is this a problem with the submit-o-matic compiler or with my own compiler?

Well, I tried that, and it compiled on both my machine and on the compiler there. However, it said that my program gave the wrong answer, so I try running the program on my computer. The correct output should look like

(x - 17.716)^2 + (y - 0.735)^2 = 15.733^2
x^2 + y^2 - 35.433x - 1.470y + 66.865 ...

In one of the files that I've submitted, I wrote
ostringstream o;
o << fixed << setprecision(3);

I made sure to include
#include <iomanip>
#include <sstream>
#include <string>
#include <cmath>
#include <vector>
#include <iostream>
using namespace std;


And this all worked perfectly fine on ...

Check out the usage of sort:

(copied from http://www.cppreference.com/cppalgorithm/sort.html):
#include <algorithm>
void sort( iterator start, iterator end );
void sort( iterator start, iterator end, StrictWeakOrdering cmp );

So you need 2 or 3 arguments after sort, and the first 2 muts be ...

Yeah, that fixed it! (Feeling pretty dumb, though!) Any idea why it would still compile on my machine though?

I've never had any weird problems getting my submitted code to be compiled, but all the sudden I can't figure out what's going on.

My C++ program begins:

1 #include <iterator>
2 #include <ctype.h>
3 #include <iostream>
4 #include <vector>
5 #include <algorithm>
6
7 using namespace std;
8 ...