Create a matrix with the integers from 1 to n arranged in a triangular shape.

Every row i of the matrix contains i integers, and the rest of the elements are zeros.

Examples:

Input:  n = 6
Output: mat = [1 0 0
               2 3 0
               4 5 6]

Input:  n = 12
Output: mat = [1  0  0  0 
               2  3  0  0 
               4  5  6  0 
               7  8  9  10
               11 12 0  0]
Solve

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Last Solution submitted on May 29, 2026

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Chris Cleveland Paul Bower Riccardo G. Matthew Bolyard

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