Sfida di programmazione: Number Triangle

Problema

Build a number triangle: row i (counting from 1) lists the numbers 1, 2, …, i.

Implement number_triangle(rows).

rows: The number of rows.

Return the triangle as a list of rows.

0 ≤ rows ≤ 30

Esempio 1

Input:
rows = 3

Output atteso:
expected = [
    [1],
    [1, 2],
    [1, 2, 3]
]

Input:
long long rows = 3;

Output atteso:
std::vector<std::vector<long long>> expected = {
    {1},
    {1, 2},
    {1, 2, 3}
};

Input:
long rows = 3;

Output atteso:
long[][] expected = new long[][] {
    new long[] {1},
    new long[] {1, 2},
    new long[] {1, 2, 3}
};

Rows are [1], [1, 2] and [1, 2, 3].

Esempio 2

Input:
rows = 0

Output atteso:
expected = []

Input:
long long rows = 0;

Output atteso:
std::vector<std::vector<long long>> expected = {};

Input:
long rows = 0;

Output atteso:
long[][] expected = new long[][] {};

No rows were requested, so the triangle is empty.

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