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Whats wrong with this code:

#include <iostream>
#include <fstream>
#include <string>
#include <algorithm>
#include <vector>
using namespace std;

struct rec {

What is the equivalent of HashSet in C++? How do I use it (as in basic add, remove, and iterating through)

Is it possible to increase the max size of a string?

I was storing a lot of things into my string, and it seems to have run out of memory. I have thought about using a array/vector of characters, however, I wish to retain the ability to do substring,...

How does substr() in the string class work?? Does it copy over each character linearly?

Thanks in advance

I have found that often I am asking which way of solving problems are faster. Thus I will ask how to time a program here so that I can test the runspeed myself. In Java I know you can use

long...

Thank you very much

What would the difference be if i was an iterator or a pointer? Would it advance the iterator/pointer first, then go through the for loop if it was prefix form?

I have heard that ++i and i++ are different from each other. I am aware that if I do something like:

int i = 0;
int k = i++;

then k is 0, and if I do

int i = 0;
int k = ++i;

Are iterators the only way to get data from a list? Can I use list[1]??

Thanks in advance.

Thank you very much.

How do you time in C++? I have only done it in Java.

Thanks in advance

I know I can iterate through a vector using:

for(vector::size_type i = 0; i < vec.size(); i++){
cout << vec[i];
}
(vec is the name of the vector)

I also know that I can use an iterator...