Added missing classes from final year at OSU

OSU Coursework/CS 325 - Analysis of Algorithms/Julie Schuffort - Passed/Homework 4/README.txt

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+To run this program, place the file "act.txt" in the same directory, then run
+
+python3 activity_selection.py

OSU Coursework/CS 325 - Analysis of Algorithms/Julie Schuffort - Passed/Homework 4/act.txt

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+11
+1 1 4
+2 3 5
+3 0 6
+4 5 7
+5 3 9
+6 5 9
+7 6 10
+8 8 11
+9 8 12
+10 2 14
+11 12 16
+3
+3 6 8
+1 7 9
+2 1 2
+6
+1 1 5
+2 3 6
+3 6 10
+4 8 11
+5 11 15
+6 12 15

OSU Coursework/CS 325 - Analysis of Algorithms/Julie Schuffort - Passed/Homework 4/activity_selection.py

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+INPUT_FILE = "act.txt"
+
+
+def greedy_activity_selector(activity_set):
+    activity_num_index = 0
+    activity_start_index = 1
+    activity_finish_index = 2
+
+    activity_set.sort(key=lambda activity: activity[activity_start_index], reverse=True)
+
+    selections = [activity_set[0][activity_num_index]]
+    comparison_activity_index = 0
+
+    for i in range(1, len(activity_set)):
+        if activity_set[i][activity_finish_index] <= activity_set[comparison_activity_index][activity_start_index]:
+            selections.append(activity_set[i][activity_num_index])
+            comparison_activity_index = i
+
+    return list(reversed(selections))
+
+
+def get_activity_sets(input_filename):
+    file_activity_sets = []
+
+    with open(input_filename, "r") as input_file:
+        lines = input_file.readlines()
+        last_index = len(lines) - 1
+
+        line_index = -1
+
+        while line_index != last_index:
+            current_set = []
+            line_index += 1
+            num_activities = int(lines[line_index])
+
+            for activity_number in range(num_activities):
+                line_index += 1
+
+                activity = lines[line_index]
+                activity_split = activity.split(" ")
+
+                current_set.append(list((int(value) for value in activity_split)))
+
+            file_activity_sets.append(current_set)
+
+    return file_activity_sets
+
+
+if __name__ == "__main__":
+    activity_sets = get_activity_sets(INPUT_FILE)
+
+    for set_number, current_activity_set in enumerate(activity_sets):
+        selected_activities = greedy_activity_selector(current_activity_set)
+
+        print("Set {}".format(set_number + 1))
+        print("Number of activities selected = {}".format(len(selected_activities)))
+        print("Activities: {}".format(" ".join([str(activity) for activity in selected_activities])))
+        print()