100 lines
2.0 KiB
C++
100 lines
2.0 KiB
C++
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#include <algorithm>
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#include <fstream>
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#include <iostream>
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#include <string>
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#include <vector>
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void DebugOutput(std::vector<std::vector<char>> &stacks)
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{
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// DEBUG:
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for(const auto &st : stacks)
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{
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std::cout << "Stack: " << std::endl;
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for(const auto &ch : st)
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std::cout << "[" << ch << "]" << std::endl;
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std::cout << std::endl;
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}
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}
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std::vector<std::string> SplitStr(std::string str, const std::string &delim)
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{
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std::vector<std::string> rtn;
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for(auto split = str.find(delim); split != std::string::npos; split = str.find(delim))
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{
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rtn.push_back(str.substr(0, split));
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str = str.substr(split + delim.size()); // chop off beginning
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}
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if(str.size())
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rtn.push_back(str);
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return rtn;
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}
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int main()
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{
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std::ifstream ifs("data.txt");
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if(!ifs.is_open())
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{
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std::cerr << "Missing data.txt." << std::endl;
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return -1;
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}
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std::vector<std::vector<char>> stacks;
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// Step 1: Parse Starting Position
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for(std::string line; std::getline(ifs, line); )
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{
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if(line == "")
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break;
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stacks.resize((line.size() + 1) / 4);
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for(auto idx = 0; (idx * 4) < line.size(); ++idx)
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if(line[1 + idx * 4] != ' ')
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stacks[idx].push_back(line[1 + idx * 4]);
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}
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// Step 2: Clean up data:
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for(auto &st : stacks)
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{
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// clear out last line of each, seeing as how they're just index numbers:
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st.pop_back();
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// reverse list since we parsed top to bottom and inserted backwards...
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std::reverse(st.begin(), st.end());
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}
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// DebugOutput(stacks);
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// Step 3: Parse Actions
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for(std::string line; std::getline(ifs, line); )
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{
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if(line == "")
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continue;
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auto actions = SplitStr(line, " ");
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if(actions.size() != 6)
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{
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std::cerr << "Data corrupt: " << line << std::endl;
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exit(-1);
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}
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long amt = std::atoi(actions[1].c_str());
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long from = std::atoi(actions[3].c_str()) - 1;
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long to = std::atoi(actions[5].c_str()) - 1;
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for(auto i = 0; i < amt; ++i)
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{
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stacks[to].push_back(stacks[from].back());
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stacks[from].pop_back();
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}
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}
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// DebugOutput(stacks);
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for(const auto &st : stacks)
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std::cout << st.back();
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std::cout << std::endl;
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return 0;
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}
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