## 386 - Perfect Cubes

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deddy one
Experienced poster
Posts: 120
Joined: Tue Nov 12, 2002 7:36 pm

### 386 so simple BUT...

my program gives me 216 lines of output and
it gives me WA

how many output lines it should be ?????
the sorting method is based ascending value of
"b" right??
Jalal
Learning poster
Posts: 65
Joined: Sun Jun 02, 2002 8:41 pm
Contact:
Cheak ur inner loops!
yes the sorting method is based ascending value of
"b"
deddy one
Experienced poster
Posts: 120
Joined: Tue Nov 12, 2002 7:36 pm
so, how many lines of output are there in this problem??

I try to use double data type to guard against miscalculation
and it gives me 216 lines.

thanks.
angga888
Experienced poster
Posts: 143
Joined: Sat Dec 21, 2002 11:41 am
Location: Indonesia
My output gives 223 lines.
I just use long, not double.
Try to check your loop again. You should get AC.

Good Luck
deddy one
Experienced poster
Posts: 120
Joined: Tue Nov 12, 2002 7:36 pm
thx guys
got AC now

I made stupid mistake in my loop

using long data type making the calculation faster too.
the900
New poster
Posts: 3
Joined: Tue Apr 29, 2003 5:03 pm

### 386 - keep getting wrong answer

My program has 223 lines of output, and the first ones are exactly the same as in the problem set, but I keep getting wrong answer. Does anyone know what could be wrong?
szymcio2001
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Posts: 38
Joined: Mon Dec 09, 2002 1:53 pm
Location: Poznan, Poland

### Re: 386 so simple BUT...

Rong wrote:Why does give 222 lines in my output ?
I compiled it and it printed 223 line on my computer.
Rong wrote: [cpp]
for(d=c;d<a;d++)
{
if(i==(pow(b,3)+pow(c,3)+pow(d,3)))
{
printf("Cube = %d, Triple = (%d,%d,%d)\n",a,b,c,d);
break;
}
}
}[/cpp]
This isn't verry efficient. You should check using math functions if exists a such integer d that a^3-b^3-c^3=d^3
the900
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Joined: Tue Apr 29, 2003 5:03 pm
I get 223 lines of output but the judge tells me WA. Here's the code, could you help me
szymcio2001
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Joined: Mon Dec 09, 2002 1:53 pm
Location: Poznan, Poland
[quote="the900"]I get 223 lines of output but the judge tells me WA. Here's the code, could you help me
aakash_mandhar
New poster
Posts: 38
Joined: Thu Dec 11, 2003 3:40 pm
Location: Bangalore

### 386 - Perfect Cubes

What is wrong with this code plz help.. i thought this was a cool logic but got wa....

It seems to work and gives me 223 answers.. Plz help...
Plzz help

[cpp]

# include<iostream.h>

long a;
long init,temp;
int i,j1,j2,j3;
long cube[201];
long sol[300][3];
long sc;

int find(int x,int y,int z)
{
for(int i=0;i<sc;i++)
if((sol[0]==x && sol[1]==y && sol[2]==z) || (sol[0]==x && sol[2]==y && sol[1]==z)|| (sol[2]==x && sol[1]==y && sol[0]==z) || (sol[2]==x && sol[i][0]==y && sol[i][1]==z)|| (sol[i][1]==x && sol[i][2]==y && sol[i][0]==z) || (sol[i][1]==x && sol[i][0]==y && sol[i][2]==z)) return 1;
return 0;
}

int main()
{
sc=0;
a=1;
init=7;
temp=6;
for(i=1;i<=200;i++)
{
cube[i]=a;
//cout<<a<<",\n";
a+=init;
temp+=6;
init+=temp;
}

for(i=6;i<=200;i++)
{
//cout<<cube[i]<<"\n";

for(j1=2;j1<=i-3;j1++)
{
for(j2=j1+1;j2<=i-2;j2++)
{
for(j3=j2+1;j3<=i-1;j3++)
{
if(cube[i]==cube[j1]+cube[j2]+cube[j3])
{
if(find(j1,j2,j3)==0)
{
sol[sc][0]=j1;sol[sc][1]=j2;sol[sc][2]=j3;sc++;
cout<<"Cube = "<<i<<", Triple = ("<<j1<<","<<j2<<","<<j3<<")\n";
}
}

}

}

}
}

return 1;
}

//@end_of_source_code

[/cpp]
Last edited by aakash_mandhar on Mon Jan 05, 2004 12:48 am, edited 1 time in total.
...I was born to code...
sohel
Guru
Posts: 856
Joined: Thu Jan 30, 2003 5:50 am
Location: New York

### Nothing is wrong.

I have gone through your code and found no mistakes in it. So I decided to submit it and was not surprised to see 'accepted' as the reply. It means yours was a cool logic.
aakash_mandhar
New poster
Posts: 38
Joined: Thu Dec 11, 2003 3:40 pm
Location: Bangalore

### AC

Thx for the help..

I have removed my id from the post..
Thx again

...I was born to code...
WR
Experienced poster
Posts: 145
Joined: Thu Nov 27, 2003 9:46 am

### WA 386

Hi,

using brute force (or ''complete enumeration'' as I prefer to call it)
I get 223 lines of output - but a WA.

Summarizing the rules:

1) sort by non-descending a
2) b <= c <= d
3) if there's more than one triple for a specific a,
sort by the value of b (ascending)

Example:

Cube = 150, Triple = (24,102,132)
Cube = 150, Triple = (71,73,138)
Cube = 150, Triple = (75,100,125)
Cube = 150, Triple = (76,86,132)

So what's my mistake?!

Any hints?
pavelph
Learning poster
Posts: 57
Joined: Wed Dec 10, 2003 7:32 pm
Location: Russia, Saint-Petersburg
First outputs for this problem:
[pascal]program acm386; {a^3=b^3+c^3+d^3}
begin
writeln('Cube = 6, Triple = (3,4,5)');
writeln('Cube = 12, Triple = (6,8,10)');
writeln('Cube = 18, Triple = (2,12,16)');
writeln('Cube = 18, Triple = (9,12,15)');
writeln('Cube = 19, Triple = (3,10,18)');
writeln('Cube = 20, Triple = (7,14,17)');
writeln('Cube = 24, Triple = (12,16,20)');
writeln('Cube = 25, Triple = (4,17,22)');
writeln('Cube = 27, Triple = (3,18,24)');
writeln('Cube = 28, Triple = (18,19,21)');
writeln('Cube = 29, Triple = (11,15,27)');
writeln('Cube = 30, Triple = (15,20,25)');
writeln('Cube = 36, Triple = (4,24,32)');
writeln('Cube = 36, Triple = (18,24,30)');
[/pascal]
I hope it helps you.
WR
Experienced poster
Posts: 145
Joined: Thu Nov 27, 2003 9:46 am
Thanks for the post pavelph,

but it doesn't help because my output is exactly the same.

Code: Select all

``````#include <stdio.h>         /* printf */

/*****************************
* ACM Contest - Problem 386       *
*****************************/

int main(void)
{
const int max = 200;
long a, b, c, d;
long a3, b3, c3, d3;

for (a=2;a<=max;a++){
a3 = a*a*a;
for (b=2;b<=a;b++){
b3 = b*b*b;
for (c=b;c<=a;c++){
c3 = c*c*c;
for (d=c;d<=a;d++){
d3 = d*d*d;
if (b3+c3+d3 == a3)
printf("Cube = %ld, Triple = (%ld,%ld,%ld)\n",a,b,c,d);
}
}
}
}
return 0;
}``````