The downloaded directory has two sub-directory:

• main_debug
• main_test

You should start with the main.S in main_debug directory. The task is to implement merge in the main.S. Run Make to generate a riscv file and spike -d <filename> to debug your program. For more debugging info, check out lab pages.

To check for more test cases and if your program(main.S) will work in online judge, you can cd main_test, (optionally modify array in main.c), run Make, and spike merge.riscv to see the results.