给你一个数N，让你求出 这样的组合A,B,C，A,B,C要满足如下条件：A*A + B*B = C*C,A+B+C<=N

            int n = 100;
            Action<int, int, Action<int>> myfor = (start, end, callback) => {
                for (int i = start; i < end; i++) {
                    callback(i);
                }
            };

            myfor(1, n, (a) => myfor(1, n, (b) => myfor(1, n, (c) => {
                if (a * a + b * b == c * c)
                    Console.WriteLine("a:{0},b:{1},c:{2},n:{3}", a, b, c, n);
            })));

            for (int a = 1; a < n; a++) {
                for (int b = 1; b < n; b++) {
                    for (int c = 1; c < n; c++) {
                        if (a * a + b * b == c * c)
                            Console.WriteLine("a:{0},b:{1},c:{2},n:{3}", a, b, c, n);
                    }
                }
            }

            var r = from a in Enumerable.Range(1, n)
                    from b in Enumerable.Range(a, n)
                    from c in Enumerable.Range(b, n)
                    where a + b + c < n &&
                    a * a + b * b == c * c
                    select new { A = a, B = b, C = c };
            foreach (var item in r) {
                Console.WriteLine("a:{0},b:{1},c:{2},n:{3}", item.A, item.B, item.C, n);
            }

给你一个数N，让你求出 这样的组合A,B,C，A,B,C要满足如下条件：A*A + B*B = C*C,A+B+C<=N

最后一种方法的结果和前两种的结果不一样，不知道为啥。