add some exe

interview_cake/data_structures/angry_bird.py

@@ -0,0 +1,37 @@
+#!/bin/python
+
+"""
+Each round, players receive a score between 0 and 100, which you use to rank them from highest to lowest. So far you're using an algorithm that sorts in O(n\lg{n})O(nlgn) time, but players are complaining that their rankings aren't updated fast enough. You need a faster sorting algorithm.
+
+Write a function that takes:
+
+a list of unsorted_scores
+the highest_possible_score in the game
+and returns a sorted list of scores in less than O(n\lg{n})O(nlgn) time.
+"""
+
+def sort_scores(unsorted_scores, highest_score):
+
+    score_counts = [0] * (highest_score+1)
+
+    for score in unsorted_scores:
+        score_counts[score] += 1
+
+    sorted_scores = []
+
+    for score in range(len(score_counts)-1, -1, -1):
+        count = score_counts[score]
+
+        for i in range(count):
+            sorted_scores.append(score)
+
+    return sorted_scores
+
+
+
+if __name__ == '__main__': 
+
+    unsorted_scores = [37, 89, 41, 65, 91, 53]
+    HIGHEST_POSSIBLE_SCORE = 100
+
+    print sort_scores(unsorted_scores, HIGHEST_POSSIBLE_SCORE)

interview_cake/data_structures/inflight_entrain.py

@@ -0,0 +1,42 @@
+#!/bin/python
+
+"""
+Users on longer flights like to start a second movie right when their first one ends, 
+but they complain that the plane usually lands before they can see the ending. 
+So you're building a feature for choosing two movies whose total runtimes will equal the exact flight length.
+
+Write a function that takes an integer flight_length (in minutes) and a 
+list of integers movie_lengths (in minutes) and returns a boolean indicating 
+whether there are two numbers in movie_lengths whose sum equals flight_length.
+
+When building your function:
+
+Assume your users will watch exactly two movies
+Don't make your users watch the same movie twice
+Optimize for runtime over memory
+"""
+
+def is_there_two_movies(flight_length, movie_lengths):
+    movie_lengths_seen = set()
+
+    for first_movie_length in movie_lengths:
+        matching_second_movie_length = flight_length - first_movie_length
+        if matching_second_movie_length in movie_lengths_seen:
+            return True
+        movie_lengths_seen.add(first_movie_length)
+
+    return False
+
+
+
+if __name__ == '__main__':
+
+    flight_length = 10
+
+    movie_lengths = [2, 4, 7]
+    print(is_there_two_movies(flight_length, movie_lengths))
+    print("Should be True")
+
+    movie_lengths = [5, 6, 7, 8]
+    print(is_there_two_movies(flight_length, movie_lengths))
+    print("Should be False")