Sorting: Bubble Sort - Hacker Rank Solution

Check out the resources on the page's right side to learn more about bubble sort. The video tutorial is by Gayle Laakmann McDowell, author of the best-selling interview book Cracking the Coding Interview.

Merge Sort: Counting Inversions - Hacker Rank Solution

Check out the resources on the page's right side to learn more about merge sort. The video tutorial is by Gayle Laakmann McDowell, author of the best-selling interview book Cracking the Coding Interview.

Fraudulent Activity Notifications - Hacker Rank Solution

HackerLand National Bank has a simple policy for warning clients about possible fraudulent account activity. If the amount spent by a client on a particular day is greater than or equal to  the client's median spending for a trailing number of days, they send the client a notification about potential fraud.

Sorting: Comparator - Hacker Rank Solution

Check out the resources on the page's right side to learn more about sorting. The video tutorial is by Gayle Laakmann McDowell, author of the best-selling interview book Cracking the Coding Interview.

Mark and Toys - Hacker Rank Solution

Mark and Jane are very happy after having their first child. Their son loves toys, so Mark wants to buy some. There are a number of different toys lying in front of him, tagged with their prices. Mark has only a certain amount to spend, and he wants to maximize the number of toys he buys with this money.