/* A simple one This robot roams around a 2D grid. It starts at (0, 0) facing North. After each time it moves, the robot rotates 90 degrees clockwise. So you'll calculate the bot final position given the amount of movement for example if the robot is given the movements 20, 30, 10, 40 then it will move: 20 steps North, now at (0, 20) 30 steps East, now at (30, 20) 10 steps South. now at (30, 10) 40 steps West => now at (-10, 10) so it will end up at this coord(-10,10) More examples func(0,0) ➞ [0, 0] # No movement means the robot stays at (0, 0). func(-10, 20, 10) ➞ [20, -20] # The amount to move can be negative. Also each movement is a whole number Note: This code needs C++17 or higher compiler */ #include #include using namespace std; // Robot walk directions enum class DIR { N, E, S, W }; auto[dX, dY] = pair(); void print_dist(auto&& dX, auto&& dY) { cout << "Current Position:\n" << "X = " << dX << " "<< "Y = " << dY << "\n"; } auto RoboWalkImpl=[](auto&& dir, auto&& dist, auto&& ...args) { switch(dir) { case DIR::N: dY += dist; // print distance and change dir print_dist(dX, dY); dir = DIR::E; break; case DIR::E: dX += dist; print_dist(dX, dY); dir = DIR::S; break; case DIR::S: dY -= dist; print_dist(dX, dY); dir = DIR::W; break; case DIR::W: dX -= dist; print_dist(dX, dY); dir = DIR::N; break; } if constexpr (sizeof...(args) > 0) { RoboWalkImpl(dir, args...); } };// end RoboWalkImpl auto RoboWalk = [](auto&& ...args) { // call with args and initial direction // North RoboWalkImpl(DIR::N, args...); cout << "\n\n"; dX = dY = 0; }; // end RoboWalk int main() { cout << "RoboWalk(10,20,30,40,50):\n"; RoboWalk(10,20,30,40,50); cout << "RoboWalk(50,40,8,2,5):\n"; RoboWalk(50,40,8,2,5); cout << "RoboWalk(0,40,0,0,5,5):\n"; RoboWalk(0,40,0,0,5,5); }

[Challenge] RoboWalk.cpp