Write it, run it, read the output

This is a scratch drill — your code runs, nothing is graded or recorded. No test cases, no expected output, no verdict.

TASK

Use nested loops over the string "abc". For each start and exclusive end, print the substring on its own line using C++ substr(start, end - start), producing the six non-empty substrings in generation order.

a
ab
abc
b
bc
c