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### 10965 - Khepel's Problem

Posted: **Mon Nov 14, 2005 11:07 pm**

by **luishhh**

Hi

I think this problem is badly specified, basically I don't know how to handle questions such: does [0,1] overlaps [1,2]? I consider the time the cat is sleeping as a closed interval, as well as the times the sprinklers are pouring water in each cell. Maybe this approach is wrong and I should have considered open intervals.

This is the function I think is the main task:

Code: Select all

```
int overlap (int c, int d, int module) {
/*return 1 if there exist x in [a,b] such that x mod module is in the interval [c,d] (c,d<module), else return 0*/
if (b - a >= module) return 1;
b %= module;
a %= module;
if (a < c)
if (b >= a && b < c) return 0;
else return 1;
else if (a > d)
if (b >= a && b < module || b < c) return 0;
else return 1;
return 1;
}
```

Posted: **Tue Nov 15, 2005 1:01 am**

by **Moha**

As in problem statement, time interval for each sprinklers begin at time=0

and if a sprinkler has period p then, according to one-cycle movement, that sprinkler will pour water at it`s first direction for [0,p) and in time p it changes its direction without pouring water!

Posted: **Fri Nov 18, 2005 8:50 pm**

by **tan_Yui**

Hi, everyone.

I got WA several times.

The reason may be my misunderstanding about the problem description like as him.

Would you give me the correct answer for following input?

Code: Select all

```
10 10 1
5 5 8 3 N
7 8
10 10 1
5 5 8 3 N
8 8
10 10 1
5 5 8 3 N
8 9
10 10 1
5 5 8 3 N
8 23
10 10 1
5 5 8 3 N
8 24
10 10 1
10 10 1 3 E
8 10
10 10 1
5 5 1 1 N
0 1000000000
100 100 4
5 5 1000000 1 N
100 5 1000000 98 W
30 30 900000 5 E
30 30 900000 1 N
3456789 6000000
0 0 0
```

My output is :

Thank you.

Posted: **Sat Nov 19, 2005 11:22 pm**

by **w k**

Hi,

Another question: Is it possible that 2 sprinklers have the same coordinates (but maybe different R and/or d)?

Wojciech

Posted: **Sun Nov 20, 2005 3:59 pm**

by **w k**

Hi tan_Tui!

For Your input my code gives:

96

99

99

93

93

99

95

9874

However I got WA too!

Wojciech

Posted: **Sun Nov 20, 2005 4:52 pm**

by **Moha**

My Accpetd Solution gives me:

- 96

99

96

93

93

99

95

9874

And there is no two sprinklers have same coordinates.

Posted: **Mon Nov 21, 2005 12:29 pm**

by **tan_Yui**

Thank you for your reply, "Moha", "w k"!

I read my code again and improved, then got same answer as Moha output.

...but I keep judge WrongAnswer.

Please help again.

What is correct answer for this input?

And, if you have some special input set, please show me...

Code: Select all

```
10 10 1
5 5 8 3 N
9 17
10 10 1
5 5 8 3 N
17 17
10 10 1
5 5 8 3 N
18 18
10 10 1
5 5 8 3 N
26 26
10 10 1
5 5 8 3 N
0 0
10 10 1
5 5 1 3 N
1 1
10 10 1
5 5 8 3 N
16 18
0 0 0
```

My code outputs :

Best regards.

Posted: **Mon Nov 21, 2005 8:13 pm**

by **w k**

My program gives the same output as yours but I got WA too. I've no idea what could be the problem now.

Wojciech

Posted: **Mon Nov 21, 2005 9:30 pm**

by **w k**

Hi tan_Yui!

I had a problem with inputs like this:

1 10 1

1 1 1 3 E

1 8

10 1 1

10 1 1 3 S

5 12

0 0 0

The correct output is:

6

6

Now I got AC

Thanks to Moha and tan_Yui!

Wojciech

Posted: **Tue Nov 22, 2005 5:43 am**

by **tan_Yui**

Hello, "w k".

Your input was just a critical input of my code!

After changed to correspond, I could get Accepted!

Thank you, "w k" and Moha!

Posted: **Thu Nov 24, 2005 9:57 am**

by **kp**

I think problem statement is ambigous.

Coordinaters of sprinklers are given as <row> <column>

But size of the field as <number of columns> <number of rows>

I realize it only after online contest...

Posted: **Thu Nov 24, 2005 10:18 am**

by **tan_Yui**

kp wrote:I think problem statement is ambigous.

Coordinaters of sprinklers are given as <row> <column>

But size of the field as <number of columns> <number of rows>

I realize it only after online contest...

...? I can't find your problem.

The first line of each test case contains 3 integers 1<=m,n<=100 (the dimensions of the garden), and 0<=k<=1000 which is the number of sprinklers in it. The next lines each consist of 4 non negative integers r,c,p,R and a character d. 1<=r<=m and 1<=c<=n indicate the coordinates of the i-th sprinkler in row-column format ......

refer to :

http://online-judge.uva.es/contest/data ... et/p1.html
Best regards.

Posted: **Thu Nov 24, 2005 10:40 am**

by **kp**

My problem was that I considered m is a number of rows and n number of columns! (row-column format). When I saw here last post by w k I realized that m is a number of columns!

After changing

Code: Select all

```
for i:=1 to m do
for j:= 1 to n do
```

to

Code: Select all

```
for i:=1 to n do
for j:= 1 to m do
```

I got AC

Sample test was a square so nothing was suspicious...

Posted: **Thu Nov 24, 2005 11:44 am**

by **tan_Yui**

kp wrote:My problem was that I considered m is a number of rows and n number of columns! (row-column format). When I saw here last post by w k I realized that m is a number of columns!

Because my AC code is handled m and n as row-column format,

I think it is your code own problem.

And, I think the last post of "w k" didn't say about such things.

I want to know other solver's opinion too.

Best regards.

Posted: **Thu Nov 24, 2005 2:52 pm**

by **kp**

tan_Yui wrote:kp wrote:My problem was that I considered m is a number of rows and n number of columns! (row-column format). When I saw here last post by w k I realized that m is a number of columns!

Because my AC code is handled m and n as row-column format,

I think it is your code own problem.

And, I think the last post of "w k" didn't say about such things.

I want to know other solver's opinion too.

Best regards.

Damn, you right!

I can't believe me so stuppid

my code starts like this:

but it should be

Thats how I sometimes get WA during contest...