#20. d013: 符号函数
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ID: 20
Type: Default
1000ms
128MiB
Tried: 3337
Accepted: 1872
Difficulty: 3
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d013: 符号函数
Description
Format
Input
一个整数
Output
一个数字（1，0，或者-1）
Samples
12
1
Related
In following homework: