From 0-9 in the arbitrarily selected four non-identical number, for example, can not be 5555, which can be 1222 used the number 4 ranked the greatest number, 2221, the smallest number of 1222 maximum minus minimum: 2221-1222 = 0999 by 0999 the number of these four to continue to repeat the above steps up to 7 steps, this number will be 6174

数学黑洞\sx.cpp
........\数学黑洞.dsp
........\数学黑洞.dsw
........\数学黑洞.ncb
........\数学黑洞.opt
........\Debug
数学黑洞

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