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Re:求教高手 cmp函数

Posted by zpclinux at 2012-07-28 22:40:20 on Problem 2031
In Reply To:求教高手 cmp函数 Posted by:jyl890329 at 2012-04-05 09:03:22
> int cmp(const void *a, const void *b)
> {
>     return (*(edge *)a).len > (*(edge *)b).len; 
> }
> 
> int cmp(const void *a, const void *b)
> {
>     return (*(edge *)a).len > (*(edge *)b).len ? 1 : -1;
> }
> 
> 这两种有区别吗,为什么我第一种是WA,第二种是AC呢?其它部分都一样啊。

多谢提醒, 开始时候按正确写法写了,调试时候以为这错了给注上了,结果交了就wa,看到你这提示我改回来交ac了, 这里因为cmp函数返回值定义的是int类型, 如果直接相减的结果是double类型不配匹

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