solution to problem 10300 in C++

10300.cc

#include <algorithm>
#include <iostream>
#include <vector>

int main() {
	int area, friendliness, animals;
	int tests, farmers, aux = 0;
	std::vector<int> debt;

	std::cin >> tests;

	for(; tests > 0; tests--, aux = 0) {
		std::cin >> farmers;
		for(; farmers > 0; farmers--) {
			std::cin >> area >> animals >> friendliness;
			aux += area * friendliness;
		}
		debt.push_back(aux);
	}

	std::for_each(debt.begin(), debt.end(), [](auto d) { std::cout << d << "\n"; });
	return 0;
}