Deep, Dark, Fantastic!

题目大意

$1/1$ , $1/2$ , $1/3$ , $1/4$, $1/5$

$2/1$, $2/2$ , $2/3$, $2/4$

$3/1$ , $3/2$, $3/3$

$4/1$, $4/2$

$5/1$

做法

$\frac{1}{1}$

$\frac{1}{2},\frac{2}{1}$

$\frac{3}{1},\frac{2}{2},\frac{1}{3}$

$\frac{1}{4},\frac{2}{3},\frac{3}{2},\frac{4}{1}$

$...$

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