Strange note-taking sauce

Excerpt from Rokua:

//0x3f3f3f3f can also bring us an unexpected bonus: if we want to clear an array, we usually use code like memset (A,0,sizeof (a)) to do it (convenient and efficient)

But when we want to assign an array all to infinity (such as the initialization of the adjacency matrix when solving the graph theory problem), you can't use the memset function to write loops.

(It's really painful to write these unimportant code.)

//We know that this is because the memset is in bytes, and it is able to clear 0 of the array because 0 of each byte is 0

//Well now, if we set infinity to 0x3f3f3f3f, then miracles happen, and every byte of 0x3f3f3f3f is 0x3f!

So to set a memory to infinity, we only need memset (A,0x3f,sizeof (a)).

http://blog.csdn.net/u011394362/article/details/39135107

Strange note-taking sauce