Problem Description
A Magic Square is of order N is an NxN matrix containing the integers from1 to N2 arranged so that the sum of each row, column and the corner-to-corner diagonal are all equal. Write a program to create Magic Squares of odd order (1,3,5,7, etc.) up to order 51.
Background & Techniques
For small squares we could use the brute force approach as used in the 3x3 matrix in the rotating sums problem. But recall from earlier exercises that there are X! ways to arrange X numbers and 10! is approaching the upper limit that can be solved quickly (10! is about 3.6 million). This implies that finding the solution by brute force for an order 5 square would require trying up to 25! permutations of the numbers from 1 to 25. Clearly not a practical approach.
Like many puzzles of a mathematical bent, Magic Squares have been studied for hundreds of years. The algorithm used here for odd order Magic Squares was discovered at least 500 years ago. I'll leave it to the reader to search out the pertinent history.
There's the algorithm:
"Start with 1 in the middle of the top row; then go up and left assigning numbers in increasing order to empty cells; if you fall off of the square imagine the same square as tiling the plane and continue; if a cell is occupied, move down instead and continue."
From that statement, the implementation is straightforward. A couple of tricks are applied to the StringGrid used to display the results. The individual cell sizes are adjusted to contain the maximum values for a particular square. The font is set to size 8 if numbers greater than 100 need to be displayed and to size 12 for smaller squares. The C function is used to set the cell width and height for the maximum value at this font size. Finally the overall grid size is adjust to be just large enough to contain the cells (plus gridlines).
The program only has about 60 user coded statements, so we'll classify it as Beginners.
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Saturday, February 19, 2005
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Matrixz MATRIXZ 통제선 모 체 협회
Canada Invest: TCS newswire; Risk Acknowlegement
MATRIXZ ?협회
우리의 사업과 정보 서버에 환영
Ma'trixz ? (ma'triks; mat'riks), n.; 통제선 모 체 (ma'tri·sez; mat'ri -; 희소하게, ma ·tri'sez); MATRIXEZ (ma'trik-z; - siz; mat'rik-).[L ] A 장소또는 성분은 무언가가 기인하는 포 위, 모양을 가지고 가거나 개발한다. 어떤 금속, 화석, 자갈, 결정,또는 주옥이 끼워넣는 자연 물자. 무언가에게 모양, 원 천,또는 기초를 주는 저것은 그것안에 둘러싸거나 끼워넣었다
Matrixz
너 가 새로운 투자를 제조하기의 생각하고 있 다 언제든지, 너는 첫째로 회사에 관한 얼마간 만기가 되는 부 지런함, 연구및 투자를 해야 한다. 시작할 것이다 좋은 장소는 투자 규칙서 유효한 직행 너의 중개인또는 대리인 이다. 규칙 서또는 OM은 판매를 위해 제안되는 투자를 기술하는 문서 이다 . 그것은 보통적으로 회사 상호 기금의 목적의 짧은 계산서를 포함한다. 그것은 그리고 자산을 보이는금융 계산서를 포함하 고 투자자가 지불해야 하는 년의 수에 책임, 성과,및 어떤 요금 . 그러나 성과지나서 저것이 미래 성공의 개런티가아니다 것 을 생각하십시요. REITs은 좋 Titan REIT 다가오는 다음 개월 언젠가 접촉 Datalive@Gmail.com 있다
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