a pythagorean triplet is a set of three natural numbers, a
for example,
there exists exactly one pythagorean triplet for which a + b + c = 1000.
find the product abc.
這題的話思路很簡單，用for迴圈去實現，定義三個迴圈變數a，b，c，若滿足以下條件：
就把滿足條件的三個數相乘，乘積賦值給s，最後s就是輸出結果。
tic
for a = 1:1000
for b = 1:1000
for c = 1:1000
if a^(2) + b^(2) == c^(2) && a + b + c == 1000
s = a*b*c;
%%disp(a),disp(b),disp(c);
disp(s)
endend
endendtoc
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