Программа на с++

#include <algorithm>
#include <iostream>
#include <vector>
#include <set>
#include <string>
#include <sstream>
#include <fstream>
using namespace std;
class Item {
public:
Item() = default;
Item(const string& s) {
istringstream iss(s);
unsigned n;
while (iss >> n) item.push_back(n);
sort(item.begin(), item.end());
}
const vector<unsigned>& data()const {
return item;
}
private:
vector<unsigned> item;
friend bool operator<(const Item& a, const Item& b) {
return a.item < b.item;
}
};
class Box {
public:
bool load(string&& path) {
ifstream file(path);
if (file.is_open()) {
unsigned n;
file >> n;
if (!n || n > 100000) {
file.close();
return false;
}
string s;
while (getline(file, s)) if (!s.empty()) box.emplace(Item(s));
file.close();
return true;
}
return false;
}
unsigned msf()const {
auto sum = 0U;
for (const auto& item : box) sum += item.data().at(0);
return sum;
}
unsigned work(const unsigned smn, const unsigned n)const {
if (0 == smn % n) return smn;
for (const auto& item : box) {
auto x = smn - item.data().at(0);
auto sum = x + item.data().at(1);
if (0 == sum % n) return sum;
sum = x + item.data().at(2);
if (0 == sum % n) return sum;
}
return 0;
}
private:
multiset<Item> box;
};
int main() {
const auto x = 11U;
Box a;
if (a.load("A")) {
auto smn = a.msf();
auto res = a.work(smn, x);
if (res) cout << res << ' ';
}
Box b;
if (b.load("B")) {
auto smn = b.msf();
auto res = b.work(smn, x);
if (res) cout << res;
}
puts("");
system("pause > nul");
}

Бяда