75 lines
1.6 KiB
C++
75 lines
1.6 KiB
C++
#include <cstdint>
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#include <cstdlib>
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#include <iostream>
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#include <string>
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#include <vector>
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using UInt = std::uint64_t;
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struct Grid
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{
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void clear() { rows_.clear(); }
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void push_back(std::string const& row) { rows_.push_back(row); }
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[[nodiscard]] auto reflection_point() -> UInt
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{
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for (std::size_t row{0}; row < rows_.size() - 1; ++row) {
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auto top{row};
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auto bottom{row + 1};
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while (rows_[top] == rows_[bottom]) {
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if (top == 0 || bottom == rows_.size() - 1) { return row + 1; }
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--top;
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++bottom;
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}
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}
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return 0;
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}
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[[nodiscard]] auto rotate_right() const -> Grid
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{
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Grid new_grid;
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new_grid.rows_.resize(rows_.front().size());
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for (auto row{rows_.rbegin()}; row != rows_.rend(); ++row) {
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for (std::size_t i{0}; i < row->size(); ++i) {
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new_grid.rows_[i].push_back(row->at(i));
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}
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}
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return new_grid;
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}
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private:
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std::vector<std::string> rows_;
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};
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auto main() -> int try {
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std::string line;
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Grid grid;
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UInt rows{0};
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UInt cols{0};
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while (std::getline(std::cin, line)) {
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if (line.empty()) {
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rows += grid.reflection_point();
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grid = grid.rotate_right();
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cols += grid.reflection_point();
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grid.clear();
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}
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else { grid.push_back(line); }
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}
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rows += grid.reflection_point();
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grid = grid.rotate_right();
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cols += grid.reflection_point();
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std::cout << "Columns to left: " << cols << '\n' << "Rows above: " << rows << '\n' << "Score: " <<
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cols + (rows * 100) << '\n';
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return EXIT_SUCCESS;
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}
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catch (...) {
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std::cerr << "Uncaught exception.\n";
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return EXIT_FAILURE;
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}
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