The answer
Reversing the outer loop (starting from N and decrementing) is usually much cleaner and easier to read, reducing the chance of off-by-one math errors.
How to Print an Inverted Right-Angled Triangle Pattern
Is it better to reverse the outer loop or use the formula?
More FAQs in How to Print an Inverted Right-Angled Triangle Pattern
If the outer loop runs from 1 to N, the number of stars per row is N - row + 1.
Use the same loop structure, but inside the inner loop, print the variable 'col' (for 1234, 123) or 'row' (for 4444, 333).
You likely used <= instead of < when checking the boundary, causing the math to yield 0 on the final iteration, or you started counting from 0 instead of 1 without adjusting the math.
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