109 lines
2.4 KiB
C++
109 lines
2.4 KiB
C++
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#include <iostream>
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#include <fstream>
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#include <unordered_set>
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#include <optional>
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namespace split
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{
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struct sentinel {};
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struct iterator
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{
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using difference_type = ptrdiff_t;
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using value_type = std::string_view;
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using iterator_category = std::input_iterator_tag;
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using pointer = void;
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using reference = std::string_view&;
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explicit iterator(std::convertible_to<std::string_view> auto&& source, char delim)
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: source{source}
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, delim{delim}
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{
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++*this; // Compute first cell
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}
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inline iterator begin() const
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{
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return *this;
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}
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inline sentinel end() const
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{
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return sentinel{};
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}
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inline bool operator==(sentinel) const
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{
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return reached_end;
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}
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inline iterator& operator++()
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{
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if (source.empty()) {
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reached_end = true;
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return *this;
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}
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if (auto tab = source.find(delim); tab != std::string_view::npos) {
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current = source.substr(0, tab);
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source.remove_prefix(tab+1);
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} else {
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current = source;
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source = {};
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}
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return *this;
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}
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inline iterator operator++(int)
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{
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auto copy = *this;
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++*this;
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return copy;
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}
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inline std::string_view operator*() const
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{
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return current;
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}
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std::string_view current;
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std::string_view source;
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char delim;
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bool reached_end = false;
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};
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}
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std::optional<float> time2float(std::string_view time)
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{
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if (time.size() != 8) return std::nullopt; // Expected time in format hh:mm:ss
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auto const hours = ((time[0] - '0') * 10 + time[1] - '0');
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auto const minutes = ((time[3] - '0') * 10 + time[4] - '0');
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if (hours >= 24) return std::nullopt; // Single day has only 24 hours
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return (float(hours) * 60 + float(minutes)) / (60 * 24);
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}
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int main()
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{
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std::cout.sync_with_stdio(false);
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bool passed_header = false;
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for (std::string line; std::getline(std::cin, line);) {
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split::iterator row(line, '\t');
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std::advance(row, 2); if (row == split::sentinel{}) continue; std::string_view const departure_time = *row;
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std::advance(row, 1); if (row == split::sentinel{}) continue; std::string_view const stop_id = *row;
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std::advance(row, 2); if (row == split::sentinel{}) continue; std::string_view const stop_headsign = *row;
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if (!passed_header) {
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std::cout << departure_time << '\t' << stop_id << '\t' << stop_headsign << '\n';
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passed_header = true;
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continue;
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}
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auto const departure = time2float(departure_time); if (!departure) continue;
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std::cout << *departure << '\t' << stop_id << '\t' << stop_headsign << '\n';
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}
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}
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