H 题为什么错误的代码也能够 AC

题目

输入 一个整数,x

输出 一个非负整数,|x|

数据范围 x 在 int 范围内,即 x∈[−2^31,2^31−1]
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一组关于椭圆曲线密钥交换的好文

http://andrea.corbellini.name/2015/05/17/elliptic-curve-cryptography-a-gentle-introduction/

http://andrea.corbellini.name/2015/05/23/elliptic-curve-cryptography-finite-fields-and-discrete-logarithms/

http://andrea.corbellini.name/2015/05/30/elliptic-curve-cryptography-ecdh-and-ecdsa/

http://andrea.corbellini.name/2015/06/08/elliptic-curve-cryptography-breaking-security-and-a-comparison-with-rsa/