cannot post w/ specific wording

I am trying to write a post. When the post contains this line:

char * ch = strchr(tmp, str1[ii]);

WordPress always fails to post it. I always get a 503 Service Temporarily Unavailable error.

However when I change the above line to:

char * ch = strchr (tmp, str1[ii]);

It posts fine.

The actual post can be found at:

https://betweengo.com/java/2008/03/12/data-structures-interview-questions/

Any idea what’s going on?