OJ Board

I got the following output (for the given input) from my program, which was accepted:

Region #1:
(0.0,0.0)-(0.0,3.0)-(3.0,3.0)-(2.0,2.0)-(1.0,1.0)-(0.0,0.0)
Perimeter length = 10.24

Region #2:
(5.0,5.0)-(5.0,5.0)
Perimeter length = 0.00

Region #3:
(1.0,1.0)-(5.0,6.0)-(1.0,1.0)
Perimeter length ...

In C++, files are represented using streams, so you should use file streams instead of those C-like FILE structs (although FILE structs are also part of C++). Here's a way of doing this in C++:

#include <fstream>

int main() {
ofstream f("test.txt", ios::app);

if (f) {
f << "New linen";
f ...

The #include is OK. Appending ".h" to the header filename is a C convention, not C++. The C++ header that defines numeric_limits is <limits>, if someone wants to include C's <limits.h> in C++ should include <climits>.