一道立方和的计算题

题目大意如下：

找出满足 a = x^3 + y^3 + z^3 和 a = m^3 + n^3 + o^3 的 a 及其 x,y,z,m,n,o 的正整数值，其中 1 <= a <= 1000000。

试了用 Python 写了，代码如下：

flag={}
for x in range(1,100):
    for y in range(x+1,100):
        for z in range(y+1,100):
            a=x*x*x+y*y*y+z*z*z
            xyz="(%2d,%2d,%2d)" % (x,y,z)
            if a<=1000000:
                if a in flag:
                    mno=flag.get(a)
                    flag[a]=xyz + " vs " + mno
                else:
                    flag[a]=xyz
#for k,v in flag.iteritems():
# if v.find("vs") != -1:
# print k, v
for i in range(1,1000000):
    if i in flag:
        xyzmno = flag.get(i)
        if xyzmno.find("vs") != -1:
            print "%7d %s" % (i, xyzmno)