110. Pyramid

Codeforces

IDCF10269110

Time1000ms

Memory256MB

Difficulty—

English · Original

Formal · Original

Much like the previous question, you are going to be making some ASCII art. In this question your job is to make a pyramid given a number that represents the base of the pyramid. Each layer going up from the base should be 2 less in length than the previous layer. The pyramid is complete when the length of the top layer is either 1 or 2. A single number representing the base of the pyramid. Print the pyramid using "X"'s Don't forget to add spacing on the left side so that it doesn't end up looking like a right triangle. ## Input A single number representing the base of the pyramid. ## Output Print the pyramid using "X"'s [samples] ## Note Don't forget to add spacing on the left side so that it doesn't end up looking like a right triangle.

**Definitions** Let $ n \in \mathbb{Z}^+ $ denote the base width of the pyramid. **Constraints** $ n \geq 1 $, and $ n $ is odd or even; the pyramid terminates when the top layer has width 1 or 2. **Objective** Construct a pyramid with layers $ k = 0, 1, \dots, m-1 $, where: - Layer $ k $ has width $ w_k = n - 2k $, - The pyramid stops when $ w_k \in \{1, 2\} $, - Each layer is centered by prepending $ \left\lfloor \frac{n - w_k}{2} \right\rfloor $ spaces, - Each layer is composed of $ w_k $ characters 'X'. Output the pyramid as a sequence of strings, one per layer, from bottom to top.

API Response (JSON)

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