Medium · nested loops
Star Pyramid
Row i of n: n − i spaces, then i stars. Nested loops where the leading spaces are load-bearing — the judge compares them too.
Problem
Input: one integer n (1 ≤ n ≤ 20).
Output: n rows; row i (1-based) is n − i spaces followed by i asterisks.
Sample (n = 3):
*
**
***Your solution
Custom input for "Run my input"
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Stuck? Hints
Hint 1 — three loops per row
Outer loop: rows 1..n. Inside: print spaces (n - row of them), then stars (row of them), then one Console.WriteLine().
Hint 2 — the classic failure
Spaces with Console.Write(" "), not WriteLine. And the newline goes after BOTH inner loops, inside the outer one only.
Solution (try first!)
int n = int.Parse(Console.ReadLine());
for (int row = 1; row <= n; row++)
{
for (int s = 0; s < n - row; s++) Console.Write(" ");
for (int k = 0; k < row; k++) Console.Write("*");
Console.WriteLine();
}Exact-output problems are their own discipline — the nested-loop lesson walks this exact shape. Next: GCD.