101 Hack Jun 2015

Speed! Accuracy! Efficiency!

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101 Hack is back with its 26th edition! Passionate programmers will enjoy solving algorithmic challenges. It's all about speed, accuracy and efficiency: 5 challenges in 120 minutes. Every second counts!


Top 10 on leaderboard will get exclusive HackerRank T shirts.


  • Please refrain from discussing strategy during the contest.
  • All submissions are run through a plagiarism detector. Any case of code plagiarism will disqualify both users from the contest.
  • You can also code using our interface, which currently supports over 40 major languages. Learn about our environment and time limits here. If you are not yet familiar with our platform, check out Solve Me First to acquaint yourself with I/O.
  • HackerRank admin decisions are final.


  • Each challenge has a pre-determined score.
  • Your score for a problem depends on the number of test cases your submission successfully passes.
  • A participant's total score is the sum of the scores earned for each problem attempted. If you submitted more than one solution for a problem, only your highest score achieved will be used in this calculation.
  • Participants are ranked by score, with the cumulative time taken (between the contest's start time and the time of your correct submission) used to break ties.