Python Program for Activity Selection Problem

In this article, we will learn about the solution to the problem statement given below.

Problem statement− We are given n activities with their respective starting and finish times. We need to select the maximum number of activities that can be performed by a single person, provided he works on one activity at a time.

Variable notations

N - Total number of activities

S - An array that contains start time of all activities

F - An array that contains finish time of all activities

Now let’s observe the solution in the implementation below −

# Greedy approach

Example

# maximum number of activities that can be performed by a single person
def Activities(s, f ):
   n = len(f)
   print ("The selected activities are:")
   # The first activity is always selected
   i = 0
   print (i,end=" ")
   # For rest of the activities
   for j in range(n):
      # if start time is greator than or equal to that of previous activity
         if s[j] >= f[i]:
            print (j,end=" ")
            i = j
# main
s = [1, 2, 0, 3, 2, 4]
f = [2, 5, 4, 6, 8, 8]
Activities(s, f)

Output

The selected activities are:
0 1

All the variables are declared in the local scope and their references are seen in the figure above.

Conclusion

In this article, we have learned about how we can make a Python Program for Activity Selection Problem