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874. Walking Robot Simulation A robot on an infinite XY-plane starts at point (0, 0) facing north. The robot can receive a sequence of these three possible types of commands: -2: Turn left 90 degrees. -1: Turn right 90 degrees. 1 <= k <= 9: Move forward k units, one unit at a time. Some of the grid squares are obstacles. The ith obstacle is at grid point obstacles[i] = (xi, yi). If the robot runs into an obstacle, then it will instead stay in its current location and move on to the next comma...