**A. Alena's Schedule **
Add 1 each time there is a 1, if there are no 1s, check if there are two 0s and do not add 1.
The key point is to ignore the initial 0.
B. Laurenty and Shop
Add up all the paths, sort them, take the smallest two and add them together.
C. Gennady the Dentist
The problem statement is not very clear about whether the children cry before moving positions or move first and then cry.
However, upon closer inspection, it is noted that there is a note outside stating that crying occurs before moving positions.
Therefore, the volume of crying children inside the dentist's office is transmitted outside based on the state at that time.
After understanding this, the solution becomes straightforward.