The robot can sense (observe) its surrounding walls, whether there is a wall in the north (N), south (S), east (E), or west (W). 

After moving to the east, the robot observed that there were walls in NS. What is the position of the robot?

The following diagram shows part of the search graph for the slippery vacuum world. What kind of problem is this? (Choose the best answer.)

If an agent's percepts provide no information at all (a sensorless or conformant problem), what is the solution to the following vacuum world problem?

The following diagram shows the four iterations of Learning Real Time A* (LRTA*) on a one-dimensional state space. Each state is labeled with H(s), the current cost estimate to reach a goal, and every link has an action cost of 1. The red state marks the location of the agent, and the updated cost estimates at each iteration have a double circle. What will be the agent's move in the next iteration?

What search algorithm is described by the following?

What search algorithm is described by the following pseudo-code? (This search algorithm handles repeated states.)

Which is NOT correct about the vacuum world?

What kind of agent is described by the following pseudo-code?

What kind of agent is described by the following pseudo-code?

The following diagram depicts a vacuum-cleaner world that we studied in class. 

Which mapping between a percept sequence and action does NOT show a logical action?