Welcome to HackerRank's Hack For A Cause, a coding contest where your winnings help support a cause in need. Compete against top coders from around the world to give $100 to a U.S. charity that increases educational opportunities for underrepresented and under-resourced groups.

If you rank amongst the top 10 competitors, HackerRank will donate $100 in your name to an organization of your choice from the list below.

Hack For A Cause Preferred Charities

1. Anyone can participate in the contest, but only U.S. charities can be chosen for donations.

2. If a winner would like to donate to a charity not listed in "Hack For A Cause Preferred Charities", it must be approved by contest administrators. Charities receiving a donation must be officially registered and crowdfunding sites are not eligible.

3. This contest is for individuals; teams are not allowed.

4. Any competitor found cheating will be disqualified and banned from future coding contests.

5. By participating and selecting "I agree to share my contest results and profile information with sponsor companies," you are granting HackerRank permission to share your contest results and your HackerRank community profile with any sponsors listed. If there are contest sponsors, they will be plainly displayed on the contest page.

6. By participating and selecting "I'm interested in new job opportunities", you are indicating that you are willing to be considered for employment by companies using HackerRank for recruitment purposes.

Scoring: Participants are ranked by score. Your score is determined by the number of test cases your code submission successfully passes. If two participants have the same score, the tie is broken by the contestant with the lowest amount of time taken.