Magic Square

Build a normal magic square of order n ≥ 3 (rows, columns and both diagonals all sum to the magic constant M = n(n²+1)/2).

Algorithms

• n odd — Siamese / De la Loubère
• n = 4k — doubly-even, swap-on-diagonal pattern
• n = 4k+2 — Strachey (LUX), four odd-sub-squares + Strachey swaps

The status line verifies the result and reports the algorithm cost.