2.stackLab

#include <iostream>
#include <array>
#include <string>
#include <sstream>
#include <stack>
#include <cctype>

const int maxSize = 100;

std::array<int, maxSize> readInput(int& arrSize) {
	std::array<int, maxSize> arr{};
	std::string line;
	getline(std::cin, line);
	std::istringstream istr(line);
	int num;

	while (istr >> num) {
		arr[arrSize] = num;
		++arrSize;
	}
	return arr;
}

std::string caseInsensitive(std::string& command) {
	for (int i = 0; i < command.size(); ++i) {
		command[i] = tolower(command[i]);
	}
	return command;
}

void moveNumsInStack(std::array<int, maxSize>& input, int& arrSize, std::stack<int>& sum) {
	for (int i = 0; i < arrSize; ++i) {
		sum.push(input[i]);
	}
}

void calculateSum(std::stack<int>& sum) {
	int sumOfAll = 0;
	while (!sum.empty()) {
		sumOfAll += sum.top();
		sum.pop();
	}

	std::cout << "Sum: " << sumOfAll;
}


int main() {
	int arrSize = 0;
	std::array<int, maxSize> input = readInput(arrSize);

	std::stack<int> sum;

	moveNumsInStack(input, arrSize, sum);


	std::string command;
	std::cin >> command;

	const std::string delimiter = "end";

	while (true) {
		caseInsensitive(command);

		if (command == delimiter) {
			break;
		}

		if (command == "add") {
			int a, b;
			std::cin >> a >> b;
			sum.push(a);
			sum.push(b);
		}

		if (command == "remove") {
			int a;
			std::cin >> a;

			if (a < sum.size()) {
				for (int i = 0; i < a; ++i) {
					sum.pop();
				}
			}
		}
		std::cin >> command;
	}

	calculateSum(sum);

}