void TwoSum::read(const char * fn) {
std::ifstream inf (fn);
std::string line;
long int n;
int count = 0;
while (std::getline(inf, line)) {
count++;
};
numbers.reserve(count);
count = 0;
inf.clear();
inf.seekg(0);
while (std::getline(inf, line)) {
n = read_line(line);
if( numbers.find(n) == numbers.end() ) {
numbers[n] = n;
} else {
multi_numbers[n] = true;
};
count++;
};
};
