1. water problem, but I wrote a very long time, fortunately it again before.
2. think for a long time, finally found, and the need to place a lot of thinking, although find the law but not very good writing. Less than that off the first pass because I have not seen a single space. The law is also very simple, that is, after a number before subtracting a number, if it is negative to print ")", is the number of prints "(", 0, then does not print the last treatment at the beginning and end of the two numbers.
3. Code knocked out, when the submitted sample display all over, but has been WA, WA 20 times, until finally did not make it.
4. totally do not understand
5. find the law began to think, and read sample ......