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

Complete the C++ program so it prints the running example's values 1 through 10 in rows of lengths 1, 2, 3, and 4, using single spaces between values and a newline after each row.

1
2 3
4 5 6
7 8 9 10