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Problem1512--2.12-29:位运算实现正负数互转

1512: 2.12-29:位运算实现正负数互转

Time Limit: 1 Sec  Memory Limit: 128 MB  Submit: 0  Solved: 4
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Description

任意输入一个数，实现正数变负数，负数变正数，0依然是0

Input

一行一个整数n

Output

一行一个整数代表n * -1 的结果，位运算实现

Sample Input Copy 

3

Sample Output Copy 

-3

HINT



-2^31 + 1 <= n <= 2^31 -1

Source/Category

算法 位运算 
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