Task description

The program task accepts the pairs of words A B from file input.txt, makes a merge sort, and then let you find by A (inputed from stdin) the B with the help of binary search.

Usage

To run the task you can use the following command

$ make

then you'll be asked to enter the key. If the corresponding value is found it would be printed in the output, if it's not — the error message will appear, after the response you'll be able to continue making key-queries.

Here is example of work:

$ make
Enter the key: jj
val5
Enter the key: 

Enter the key: jk
Key wasn't found: jk
Enter the key: 
...

Errors handling

The program reports about errors. It could be one of the following situation:

• The file input.txt doesn't exist
• The file input.txt is empty
• The file parsing errors — right file format: each line should contain the key followed by one space and the value after it. Example:

   K1 V1
   
   K2 V2
   
   ```
  

• The corresponding key was not found