Remove rows that appear in another file

There are two files a and B. I want a file C, which contains B files to remove data that is in the same way as.

Written in C ++, fstream, ifstream, set, and vector are used.

 

#include <fstream>#include <iostream>#include <vector>#include <set>using namespace std;struct strless : public std::binary_function<const char*, const char*, bool>{    bool operator()(const char* s1, const char* s2) const    {        return strcmp(s1, s2) < 0;    }};int _tmain(int argc, _TCHAR* argv[]){    ifstream comparefile;    comparefile.open("E:\\a\\tasks.txt",ios::in);    set<char*,strless> sline;    char (*lines)[100] = new char[200][100];    int count = 0;    while(!comparefile.eof())    {                comparefile.getline(lines[count],100);        sline.insert(lines[count]);        ++count;    }    comparefile.close();        ifstream sourcefile;    sourcefile.open("E:\\a\\ttt.txt",ios::in);    char (*lines1)[100] = new char[1000][100];    count = 0;    vector<char*> vline;    while(!sourcefile.eof())    {        sourcefile.getline(lines1[count],100);        if(!sline.count(lines1[count]))            vline.push_back(lines1[count]);        ++count;    }    sourcefile.close();    fstream targetfile;    targetfile.open("E:\\a\\list.txt",ios::app);    vector<char*>::iterator vitr = vline.begin();    while(vitr!= vline.end())    {        targetfile<<*vitr<<endl;        ++vitr;    }    targetfile.close();        return 0;}