## 434 - Matty's Blocks

Moderator: Board moderators

scottaugust
New poster
Posts: 18
Joined: Thu Jun 20, 2002 4:54 pm

### 434 - Matty's Blocks

This is stupidly simple problem, yet I have not been accepted. There seems to be a large ratio of wa/ac, so I don't think I am the only one to have this problem. Is there any quirks to this problem? My solution is Min = Max( sum(Front), sum(Right) ), Max = sum( Min( Front, Right ) ), Extra = Max - Min.

Guru
Posts: 724
Joined: Wed Dec 19, 2001 2:00 am
Location: Germany
That was what I thought first, but it's not easy.
Consider for example this case:
4
0 0 2 2
1 1 1 2

Output:
Matty needs at least 7 blocks, and can add at most 3 extra blocks.

scottaugust
New poster
Posts: 18
Joined: Thu Jun 20, 2002 4:54 pm
Thank you, I had not considered a case like that - that does change the problem.

qndel
New poster
Posts: 13
Joined: Tue Feb 03, 2004 11:00 am
Location: Opole

### Why I get WA in 434

This is my code, if anybody know what is wrong pleas tell me.

var
temp,prawo:array[0..8] of byte;
przod:array[0..8,1..3] of byte;
s,m,t,n,k,j,i:byte;
f:text;
begin
assign(f,'dane.txt');
reset(f);
for j:=1 to n do
begin
for i:=0 to 8 do
begin
przod[i,1]:=0;
przod[i,2]:=0;
przod[i,3]:=0;
prawo:=0;
end;
for i:=1 to k do
begin
inc(przod[t,1]);
end;
for i:=1 to k do
begin
inc(prawo[t]);
temp:=t;
end;
s:=0;
for i:=1 to 8 do
if prawo>przod[i,1] then
s:=s+i*prawo
else
s:=s+i*przod[i,1];
przod[1,2]:=przod[1,1];
for i:=2 to 8 do
przod[i,2]:=przod[i,1]*i+przod[i-1,2];
przod[8,3]:=0;
for i:=7 downto 1 do
przod[i,3]:=przod[i+1,3]+przod[i+1,1];
m:=0;
for i:=1 to k do
m:=m+przod[temp,2]+temp*przod[temp,3];
writeln('Matty needs at least ',s,' blocks, and can add at most ',m-s,' extra blocks.');
end;
close(f);
end.
NOthing special

angga888
Experienced poster
Posts: 143
Joined: Sat Dec 21, 2002 11:41 am
Location: Indonesia

### Re: Why I get WA in 434

qndel wrote:var
temp,prawo:array[0..8] of byte;
przod:array[0..8,1..3] of byte;
s,m,t,n,k,j,i:byte;
Why do you use byte? change them with integer.

Jan
Guru
Posts: 1334
Joined: Wed Jun 22, 2005 10:58 pm
Contact:

### 434 - Matty's Blocks

Can anyone send me some test cases on this problem...
I cant find why I m getting WA.

Thans.
Last edited by Jan on Tue Jul 26, 2005 6:47 pm, edited 1 time in total.
Ami ekhono shopno dekhi...
HomePage

Jan
Guru
Posts: 1334
Joined: Wed Jun 22, 2005 10:58 pm
Contact:
Got Accepted...

Thanks...
Ami ekhono shopno dekhi...
HomePage

mamun
A great helper
Posts: 286
Joined: Mon Oct 03, 2005 1:54 pm
Contact:
Can anyone kindly post their output fot this input

Code: Select all

``````10
6
4 5 3 3 0 0
5 3 4 2 3 4
7
6 0 2 5 4 0 6
0 6 5 6 3 5 3
3
0 2 0
2 0 1
7
3 0 2 3 5 8 1
8 1 4 1 1 0 6
7
5 6 4 3 0 0 2
5 4 1 3 0 1 6
5
3 3 2 3 3
2 0 3 1 1
6
3 0 5 1 4 2
5 1 4 4 2 1
8
2 0 5 7 1 6 6 0
6 6 0 5 7 4 4 1
1
0
0
2
8 0
4 8
``````

Jan
Guru
Posts: 1334
Joined: Wed Jun 22, 2005 10:58 pm
Contact:
My Accepted code returns...

Output:

Code: Select all

``````Matty needs at least 21 blocks, and can add at most 54 extra blocks.
Matty needs at least 34 blocks, and can add at most 82 extra blocks.
Matty needs at least 3 blocks, and can add at most 0 extra blocks.
Matty needs at least 34 blocks, and can add at most 43 extra blocks.
Matty needs at least 22 blocks, and can add at most 58 extra blocks.
Matty needs at least 16 blocks, and can add at most 18 extra blocks.
Matty needs at least 20 blocks, and can add at most 42 extra blocks.
Matty needs at least 35 blocks, and can add at most 111 extra blocks.
Matty needs at least 0 blocks, and can add at most 0 extra blocks.
Matty needs at least 12 blocks, and can add at most 0 extra blocks.``````
Hope it works.
Ami ekhono shopno dekhi...
HomePage

mamun
A great helper
Posts: 286
Joined: Mon Oct 03, 2005 1:54 pm
Contact:
Thanks.
Seems my minimal calculation is wrong. Can you tell me the correct way to find it?

mamun
A great helper
Posts: 286
Joined: Mon Oct 03, 2005 1:54 pm
Contact:
Forget it. I got it accepted now.
It was so simple. But somehow I managed to overlook it and was doing what not. Found the maximal easily though.
Thanks.

stcheung
Experienced poster
Posts: 114
Joined: Mon Nov 18, 2002 6:48 am
Contact:
I spent quite some time on this problem, so just want to share my thoughts on this. Basically, finding the maximum isn't as hard as it may seem and finding the minimum may be slightly harder than you thought. For me, I actually got stuck for quite some time on finding the minimum. But after manually verifying why the following input would yield a minimum of 34, the solution was immediately obvious So for those of you who got stuck on the minimum like I did, I urge you to take the time to work out the answer on paper first.

7
3 0 2 3 5 8 1
8 1 4 1 1 0 6

sijal
New poster
Posts: 9
Joined: Fri Jul 18, 2008 12:10 pm
Location: Iran-shiraz
Contact:

### Re: 434 - Matty's Blocks

I agree with stcheuung. This problem is so simple.

metaphysis
Experienced poster
Posts: 139
Joined: Wed May 18, 2011 3:04 pm

### Re: 434 - Matty's Blocks

For minimum blocks, make sure the blocks viewed from front and right are same, and make the cross point shared by front view and right view.
For example:

7
3 0 2 3 5 8 1
8 1 4 1 1 0 6

8 pairs to 8, 1 pairs to 1, 0 pairs to 0

and remains have no pair, so they should be placed singlely, so total minimum blocks is
8 + 1 + 0 + (3 + 2 + 3 + 5) + (1 + 4 + 1 + 6) = 34