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#include <iostream>
int main (int argc, char *argv[]) {
if (argc != 2) return 1;
int depth = 0;
int forward = 0;
int aim = 0;
int aim_depth = 0;
FILE *f = fopen(argv[1], "r");
char c = fgetc(f);
std::string command;
while (c != EOF) {
if (c == '\n') {
auto token_space = command.find(" ");
if (token_space != std::string::npos) {
std::string op = command.substr(0, token_space);
int amt = std::stoi(command.substr(token_space+1));
if (op == "forward") {
forward += amt;
aim_depth += aim * amt;
}
if (op == "down") {
depth += amt;
aim += amt;
}
if (op == "up") {
depth -= amt;
aim -= amt;
}
}
command = "";
}
else command += c;
c = fgetc(f);
}
std::cout << "depth " << depth << ", "
<< "forward " << forward << ", "
<< "product " << depth * forward << std::endl;
std::cout << "using aim: depth " << aim_depth << ", "
<< "forward " << forward << ", "
<< "aim " << aim << ", "
<< "product " << aim_depth * forward << std::endl;
return 0;
}
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