diff --git a/d09.cc b/d09.cc new file mode 100644 index 0000000..aa97518 --- /dev/null +++ b/d09.cc @@ -0,0 +1,108 @@ +#include +#include +#include + +using namespace std; + +enum Dir { + UP, + DOWN, + RIGHT, + LEFT +}; + +struct Instr { + enum Dir dir; + unsigned steps; +}; + +struct Pos2d { + int x, y; + + Pos2d operator+(const Pos2d &r) const + { + return {this->x + r.x, this->y + r.y}; + } + void operator+=(const Pos2d &r) { *this = *this + r; } + + Pos2d operator-(const Pos2d &r) const + { + return {this->x - r.x, this->y - r.y}; + } + + bool operator==(const Pos2d &r) const + { + return this->x == r.x && this->y == r.y; + } +}; + +Pos2d dirs[] = { + {0, 1}, + {0, -1}, + {1, 0}, + {-1, 0} +}; + +typedef vector Input; + +template<> +struct std::hash { + size_t operator()(const Pos2d &r) const + { + return hash{}(r.x) ^ (hash{}(r.y) << 1); + } +}; + +Input parse() +{ + Input data; + for (string line; getline(cin, line);) { + Instr instr; + if (line.size() < 3 || line.at(1) != ' ') throw "parse"; + switch (line.at(0)) { + case 'U': instr.dir = UP; break; + case 'D': instr.dir = DOWN; break; + case 'L': instr.dir = LEFT; break; + case 'R': instr.dir = RIGHT; break; + } + instr.steps = stoi(line.substr(2)); + data.push_back(instr); + } + return data; +} + +unsigned p1(const Input &input, unsigned count = 2) +{ + auto knot = vector(count); + unordered_set visited; + visited.insert(knot.back()); + for (auto x : input) { + for (unsigned i = 0; i < x.steps; i++) { + knot.front() += dirs[x.dir]; + for (auto el = knot.begin(); el < knot.end() - 1; el++) { + Pos2d dist = el[0] - el[1]; + if (abs(dist.x) >= 2 || abs(dist.y) >= 2) { + if (abs(dist.x) >= 2) dist.x = dist.x > 0 ? 1 : -1; + if (abs(dist.y) >= 2) dist.y = dist.y > 0 ? 1 : -1; + el[1] += dist; + continue; + } + break; + } + visited.insert(knot.back()); + } + } + return visited.size(); +} + +unsigned p2(const Input &input) +{ + return p1(input, 10); +} + +int main() +{ + auto input = parse(); + cout << p1(input) << endl; + cout << p2(input) << endl; +} diff --git a/d09_input.txt b/d09_input.txt new file mode 100644 index 0000000..8ede1d7 --- /dev/null +++ b/d09_input.txt @@ -0,0 +1,2000 @@ +D 2 +R 2 +D 1 +U 1 +L 2 +U 2 +D 1 +R 2 +U 2 +R 2 +L 1 +D 2 +L 1 +U 1 +R 1 +D 1 +U 1 +R 1 +U 1 +R 1 +D 2 +L 1 +D 1 +L 1 +D 1 +U 1 +L 1 +R 1 +L 2 +D 1 +L 2 +R 1 +U 2 +L 2 +D 1 +U 2 +D 1 +L 1 +U 2 +L 2 +U 2 +D 2 +U 2 +D 2 +L 1 +D 2 +L 2 +D 2 +U 2 +L 2 +R 2 +U 1 +L 1 +D 2 +R 1 +D 2 +L 2 +R 1 +D 2 +R 1 +U 2 +L 2 +U 2 +D 1 +U 2 +L 2 +U 2 +L 1 +U 2 +L 1 +U 2 +D 1 +U 1 +D 2 +R 2 +L 1 +U 2 +L 1 +D 1 +R 2 +U 1 +L 1 +U 1 +R 2 +U 2 +D 2 +L 2 +U 2 +L 2 +R 1 +L 2 +U 1 +R 1 +L 1 +R 2 +U 1 +R 1 +D 1 +L 2 +R 2 +L 2 +R 1 +D 2 +R 1 +U 2 +L 2 +D 1 +R 2 +D 2 +L 2 +U 2 +D 2 +L 1 +D 2 +R 1 +L 3 +D 2 +R 1 +L 3 +R 2 +D 3 +U 3 +R 2 +L 1 +R 2 +U 2 +R 2 +L 1 +U 2 +D 1 +L 3 +U 3 +R 3 +D 2 +U 1 +L 2 +R 2 +D 1 +L 2 +U 3 +R 1 +L 3 +R 1 +L 3 +U 3 +D 3 +U 2 +R 2 +L 3 +U 2 +L 2 +U 2 +R 2 +D 1 +R 3 +L 2 +R 3 +D 2 +R 2 +L 2 +R 3 +L 2 +R 1 +U 2 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