1852. Ordered Fractions

单点时限: 2.0 sec

内存限制: 256 MB

Consider the set of all reduced fractions between 0 and 1 inclusive with denominators less than or equal to $N$.

Here is the set when $N = 5$:

0/1 1/5 1/4 1/3 2/5 1/2 3/5 2/3 3/4 4/5 1/1

Write a program that, given an integer $N$ between $1$ and $160$ inclusive, prints the fractions in order of increasing magnitude.

输入格式

One line with a single integer $N$.

输出格式

One fraction per line, sorted in order of magnitude.

样例

Input
5
Output
0/1
1/5
1/4
1/3
2/5
1/2
3/5
2/3
3/4
4/5
1/1

191 人解决,244 人已尝试。

275 份提交通过,共有 519 份提交。

2.3 EMB 奖励。

创建: 12 年,6 月前.

修改: 2 年,11 月前.

最后提交: 3 周,4 天前.

来源: USACO

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