```
def get_open_lockers(num_lockers, num_students):
list_lockers = ["open"]*num_lockers # 1st step
for k in range(2,num_students+1): # others
for i,j in enumerate(list_lockers):
if (i+1)>=(k-1):
if (i+1)%k==0:
if list_lockers[i] == "open":
list_lockers[i] = "close"
else:
list_lockers[i] = "open"
return list_lockers.count("open")
print(get_open_lockers(100, 100))
```

# Count the number of open lockers in school

Carvia Tech | May 19, 2019 | 1 min read | 136 views | Python Coding Problems

## School Daze

A group of schools has a specific number of lockers and a specific number of students. All lockers are closed on the first day of school. As students get to school they begin to play with the lockers. The first student opens every locker. The second student begins with the 2nd locker and closes every other locker. The third student starts with the third locker and changes every 3rd locker. That is, the third student opens the locker if it is closed and closes it if it is open. The 4th student starts with locker 4 and changes every 4th locker and so on. After all the students are done, display how many lockers are open.

Input | Output |
---|---|

100, 100 |
100 Lockers: 100 Students; 10 Open lockers |

10, 5 |
10 Lockers; 5 Students; 6 Open lockers |

1000, 50 |
1000 Lockers; 50 Students; 499 Open lockers |

10

###### Python Coding Problems:

- Find if credit card number is valid or not
- Find extra long factorials in python
- Write a program to find if a number is Lychrel Number in Python
- Find perfect abundant or deficient factors in python
- Write a program for Hailstone Sequence in Python
- Write a python program to find Largest Substring that occurs more than once
- Pass the ball game: NxN matrix in python

**Python Coding Problems**

###### Top articles in this category:

- Python coding challenges for interviews
- Python Flask Interview Questions
- Google Data Scientist interview questions with answers
- Top 100 interview questions on Data Science & Machine Learning
- Write a program to find if a number is Lychrel Number in Python
- Sequence of Differences in Python
- Pass the ball game: NxN matrix in python

###### Find more on this topic:

##### Machine Learning

Data science, machine learning, python, R, big data, spark, the Jupyter notebook, and much more

Last updated 1 week ago

###### Recommended books for interview preparation:

##### Similar Posts

- Connect to Cassandra with Python 3.x and get Pandas Dataframe
- Connect to MySQL with Python 3.x and get Pandas Dataframe
- Connect to Postgresql with Python 3.x and get Pandas Dataframe
- Python - Get Google Analytics Data
- Installing PySpark with Jupyter notebook on Ubuntu 18.04 LTS
- Python send GMAIL with attachment
- Send rich text multimedia email in Python
- Blueprints in Flask API Development
- Singleton Design Pattern in Python
- SVM after LSTM deep learning model for text classification

Provide email address to subscribe to this blog.