Could anybody help me? I have WA at 4th test!

u may try this test:
2
1 2
0 1
0 0

so output should be:
2
0 1
1 2

when WA is
2
1 2
0 1

This test helped me:
4
0 4
-5 0
3 4
-4 4
0 0
Answer is:
1
-4 4

Is the answer :
1
0 4
right?
i have wa 4 too,and i am confused about the output principles.

This test helped me:
10
-5 1
1 14
-5 2
2 3
3 19
0 0

The answer is:
2
-5 1
1 14

Now, let's fight with WA5 :D

why not this:

2
-5 2
1 14

?

Actually, what if there are several possibilites to cover?

I think that it does not matter which one you choose, as long as it has a minimum number of intervals. I guess the judge just tests whether the intervals you give cover the large interval.

Best regards, Erik

Edited by author 25.02.2013 04:56

It is right answer.

This test helped me too.
At last got AC. My solution is similar to task 1987.

Edited by author 05.09.2019 16:47