Procesor cu Stiva

#include <iostream>
#include <vector>
#include <cstring>

int main(){
    int n, val, temp1, temp2;
    char instr[10];
    std::cin >> n;
    std::vector<int> stack(1);
    stack.pop_back();

    for(unsigned int i = 1; i <= n; i++){
        std::cin >> instr;

        if(!strcmp("iload", instr)){
            std::cin >> val;
            stack.push_back(val);
        }else if(!strcmp("iadd", instr)){
            if(stack.size() > 1){
                temp1 = stack.back();
                stack.pop_back();
                temp2 = stack.back();
                stack.pop_back();
                stack.push_back(temp1 + temp2);
            }else{
                std::cout << "Exception: line " << i << std::endl;
            }
        }else if(!strcmp("imul", instr)){
            if(stack.size() > 1){
                temp1 = stack.back();
                stack.pop_back();
                temp2 = stack.back();
                stack.pop_back();
                stack.push_back(temp1 * temp2);
            }else{
                std::cout << "Exception: line " << i << std::endl;
            }
        }else if(!strcmp("dup", instr)){
            if(stack.size() > 0){
                temp1 = stack.back();
                stack.push_back(temp1);
            }else{
                std::cout << "Exception: line " << i << std::endl;
            }
        }
    }

    //DEBUG
    /*
    for(unsigned int i = stack.size(); i > 0; i--){
            std::cout << "at index " << i << " " <<stack[i] << std::endl;
        }
        std::cout << "--------" <<std::endl;
    **/



    std::cout << stack.size()  << std::endl;

    for(unsigned int i = stack.size() - 1; i >= 0; i--){
        std::cout << stack[i] << std::endl;
    }

    return 0;
}