Εργασία E 2007

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[Ανεβάζετε τα θέματα των εξετάσεων στον τομέα Downloads]

Είσαι πρωτοετής;... Καλώς ήρθες! Μπορείς να βρεις πληροφορίες εδώ. Βοήθεια για τους καινούργιους μέσω χάρτη.

Κατεβάστε εδώ το Android Application για εύκολη πρόσβαση στο forum.

Ανεβάζετε τα θέματα των εξετάσεων στον τομέα Downloads με προσοχή στα ονόματα των αρχείων!

Για ανανέωση (ή προσθήκη νέου) avatar, πρέπει η μεγαλύτερη διάσταση της εικόνας να είναι 110 pixels.

[^^DaRk_HunTeR]

Code:

/* This code Provided to you by A.B.US.E. (a.k.a. Addicted to Binary USage Entertainment)
 *
 * It's been an hour of stupidity and laming around until we got this piece of garbage
 * work. We, of course, obfuscated the code just to make sure you guys really try to
 * write that thing down.
 * 
 * For those who believe that this program is a useless piece of junk that all it does
 * is irritating you... You're absolutely right...
 *
 * Kisses fly to all those who try hard to learn something out of these junks...
 * Flames fly to all those who enforce people to work on such useless programs...
 * Think differently...
 *
 * We will release the original code once your deadline is over... :-)
 * Until then enjoy the summer :-)
 */

/* $ABUSE.Code: test.c,v 1.0 2007/06/28 7:17:31 ABUSE Exp $ */

#include<stdio.h>
#include<stdlib.h>
#include<sys/types.h>
#include<unistd.h>

#define le float
#define lg int
#define lq void
#define lf for
#define ls if
#define lv break
#define lw main
#define lo fprintf
#define ln stderr
#define lr scanf
#define lp malloc
#define lm sizeof
#define lt memset

le* *ld;lg*lh;lg lc;lq lu(lq){lg la,lb,li,lk;le lj;lf(la=0;la<lc;la++
){ls(la+1==lc)lv;lf(lb=0;lb<lh[la];lb++){lj=ld[la][lb];lf(li=la+1;li<
lc;li++){lf(lk=0;lk<lh[li];lk++){ls(lj==ld[li][lk])ld[li][lk]=0;}}}}}
lg lw(lq){le lj, *lx;lg la,lb,ll;lo(ln,"\x54\x79\x70\x65\x20\x74\x68"
"\x65\x20\x6e\x75\x6d\x62\x65\x72\x20\x6f\x66\x20\x53\x74\x61\x74\x69"
"\x6f\x6e\x73\x20\x3a\x20");lr("\x25\x69",&lc);lh=(lg* )lp(lc*lm(lg));
lt(lh,0,lm(lg) *lc);ld=(le* * )lp(lc*lm(le* ));lt(ld,0,lc*lm(le* ));
lf(la=0;la<lc;la++){lo(ln,"\x54\x79\x70\x65\x20\x74\x68\x65\x20\x6e"
"\x75\x6d\x62\x65\x72\x20\x6f\x66\x20\x66\x72\x65\x71\x75\x65\x6e\x63"
"\x69\x65\x73\x20\x66\x6f\x72\x20\x73\x74\x61\x74\x69\x6f\x6e\x20\x25"
"\x64\x20\x3a\x20",la);lr("\x25\x69",&lb);lh[la]=lb;ld[la]=(le* )lp(
lb*lm(le));lf(ll=0;ll<lb;ll++){lo(ln,"\x54\x79\x70\x65\x20\x74\x68"
"\x65\x20\x66\x72\x65\x71\x75\x65\x6e\x63\x79\x20\x25\x64\x20\x66\x6f"
"\x72\x20\x73\x74\x61\x74\x69\x6f\x6e\x20\x25\x64\x20\x3a\x20",ll,la);
lr("\x25\x66",&lj);ld[la][ll]=lj;}}lu();lf(la=0;la<lc;la++){lf(lb=0;
lb<lh[la];lb++){ls(ld[la][lb])lo(ln,"\x53\x74\x61\x74\x69\x6f\x6e\x20"
"\x25\x64\x20\x63\x61\x6e\x20\x67\x65\x74\x20\x66\x72\x65\x71\x75\x65"
"\x6e\x63\x79\x20\x25\x66\x20\x28\x25\x64\x29\n",la,ld[la][lb],lb);}}
}

Quote of the month :

έστω i η σειρά και j η στήλη

Τότε 

scanf(" % f ", & p [ i ] [j ] );
ή
scanf(" % f ", ( p [ i]  + j ) );
ή
scanf(" % f ", ( * ( p + i ) + j ) );

'ολα το ίδιο είναι,διαλέγεις κ παίρνεις!

Best regards...

Addicted to Binary USage Entertainment...
"Sniffing your bits since 1952..."

the time has come let us see.................enlighten us

[A.B.US.E]

We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty, and the pursuit of Happiness. ... hat whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government, having its foundation on such principles and organizing its powers in such form, as to them shall seem most likely to effect their Safety and Happiness.
The Decleration of Independence - July 4th, 1776

We decided to post two codes one that uses realloc() and one that doesn't

The obfuscated source code came from the one which doesn't use realloc().

Both programs work

Some Remarks :
What one should do here is to create a pointer that each of its members will hold memories to other pointers. Memory is allocated linearly (using malloc()) and thus the pointers can be used as arrays. Note that after each allocation we call memset() to initialize to 0 unless we immediately initialize our data by other means.
Using stderr instead of stdout allows for unbuffered output (thus we use fprintf() instead of printf()). That's an explanation cause some people got really perplexed with this..

Have fun and ask any questions here

Without realloc() :

Code:

/* This code Provided to you by A.B.US.E. (a.k.a. Addicted to Binary USage Entertainment)
 *
 * It's been an hour of stupidity and laming around until we got this piece of garbage
 * work. We, of course, obfuscated the code just to make sure you guys really try to
 * write that thing down.
 * 
 * For those who believe that this program is a useless piece of junk that all it does
 * is irritating you... You're absolutely right...
 *
 * Kisses fly to all those who try hard to learn something out of these junks...
 * Flames fly to all those who enforce people to work on such useless programs...
 * Think differently...
 *
 * We will release the original code once your deadline is over... :-)
 * Until then enjoy the summer :-)
 */

/* $ABUSE.Code: t.c,v 1.0 2007/06/28 19:17:31 ABUSE Exp $ */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

float **stations_freqs;
int *n_freqs;
int station_num;

/* Check all frequencies as follows :
 * Take current station and zero out all matching frequencies to the
 * above stations. Frequencies that are zero should not be checked.
 */
void check (void)
{
	int i, c, s, x;
	float freq;

	for (i = 0; i < station_num; i++)
	{
		if (i + 1 == station_num)
			break;

		for (c = 0; c < n_freqs[i]; c++)
		{
			freq = stations_freqs[i][c];

			/* Speed Hack */
			if (!freq)
				continue;

			for (s = i+1; s < station_num; s++)
			{
				for (x = 0; x < n_freqs[s]; x++)
				{
					if (freq == stations_freqs[s][x])
						stations_freqs[s][x] = 0;
				}
			}
		}
	}
}

int main (void)
{
	float freq, *pos;
	int i, c, p;

	/* Read the number of Stations */
	fprintf(stderr, "Type the number of Stations : ");
	scanf("%i", &station_num);

	n_freqs = (int *)malloc(station_num * sizeof(int));
	memset(n_freqs, 0, sizeof(int) * station_num);

	stations_freqs = (float **)malloc(station_num * sizeof(float *));
	memset(stations_freqs, 0, station_num * sizeof(float *));

	/* Now for each station read the number of freqs
	 * then read each freq.
	 */

	for (i = 0; i < station_num; i++)
	{
		fprintf(stderr, "Type the number of frequencies for station %d : ", i);
		scanf("%i", &c);
		n_freqs[i] = c;

		/* Allocate enough space for them */
		stations_freqs[i] = (float *)malloc(c*sizeof(float));

		/* Read them and place them */
		for (p = 0; p < c; p++)
		{
			fprintf(stderr, "Type the frequency %d for station %d : ", p, i);
			scanf("%f", &freq);
			stations_freqs[i][p] = freq;
		}
	}

	check();

	for (i = 0; i < station_num; i++)
	{
		for (c = 0; c < n_freqs[i]; c++)
		{
			if (stations_freqs[i][c])
				fprintf(stderr, "Station %d can get frequency %f (%d)\n", i, stations_freqs[i][c], c);
		}
	}

	return 0;
}

With realloc() :

Code:

/* This code Provided to you by A.B.US.E. (a.k.a. Addicted to Binary USage Entertainment)
 *
 * It's been an hour of stupidity and laming around until we got this piece of garbage
 * work. We, of course, obfuscated the code just to make sure you guys really try to
 * write that thing down.
 * 
 * For those who believe that this program is a useless piece of junk that all it does
 * is irritating you... You're absolutely right...
 *
 * Kisses fly to all those who try hard to learn something out of these junks...
 * Flames fly to all those who enforce people to work on such useless programs...
 * Think differently...
 *
 * We will release the original code once your deadline is over... :-)
 * Until then enjoy the summer :-)
 */

/* $ABUSE.Code: t-realloc.c,v 1.0 2007/07/02 16:18:43 ABUSE Exp $ */

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>

float **stations_freqs;
int *n_freqs;
int station_num;

/* Check all frequencies as follows :
 * Create a new array. Any frequency that did not
 * match is qualified to enter that array. This is
 * called straight insertion. We simply keep the new
 * size of that array and realloc() it later.
 * Make sure to free() the old array before assigning the
 * new address to it.
 */
void check (void)
{
	int i, c, s, x, n_f;
	float freq, *freqs, *p;

	for (i = 0; i < station_num; i++)
	{
		if (i + 1 == station_num)
			break;

		for (c = 0; c < n_freqs[i]; c++)
		{
			freq = stations_freqs[i][c];

			/* Speed Hack */
			if (!freq)
				continue;

			for (s = i+1; s < station_num; s++)
			{
				n_f = 0;
				freqs = (float *)malloc(n_freqs[s] * sizeof(float));
				memset(freqs, 0, n_freqs[s] * sizeof(float));
				
				for (x = 0; x < n_freqs[s]; x++)
				{
					if (freq != stations_freqs[s][x])
					{
						freqs[n_f] = stations_freqs[s][x];
						n_f++;
					}
				}

				p = (float *)realloc(freqs, n_f * sizeof(float));
				free(stations_freqs[s]);
				stations_freqs[s] = p;
				n_freqs[s] = n_f;
			}
		}
	}
}

int main (void)
{
	float freq, *pos;
	int i, c, p;

	/* Read the number of Stations */
	fprintf(stderr, "Type the number of Stations : ");
	scanf("%i", &station_num);

	n_freqs = (int *)malloc(station_num * sizeof(int));
	memset(n_freqs, 0, sizeof(int) * station_num);

	stations_freqs = (float **)malloc(station_num * sizeof(float *));
	memset(stations_freqs, 0, station_num * sizeof(float *));

	/* Now for each station read the number of freqs
	 * then read each freq.
	 */

	for (i = 0; i < station_num; i++)
	{
		fprintf(stderr, "Type the number of frequencies for station %d : ", i);
		scanf("%i", &c);
		n_freqs[i] = c;

		/* Allocate enough space for them */
		stations_freqs[i] = (float *)malloc(c*sizeof(float));

		/* Read them and place them */
		for (p = 0; p < c; p++)
		{
			fprintf(stderr, "Type the frequency %d for station %d : ", p, i);
			scanf("%f", &freq);
			stations_freqs[i][p] = freq;
		}
	}

	check();

	for (i = 0; i < station_num; i++)
	{
		if (!n_freqs[i])
			continue;
		
		for (c = 0; c < n_freqs[i]; c++)
		{
			if (stations_freqs[i][c]) /* Sanity Check */
				fprintf(stderr, "Station %d can get frequency %f (%d)\n", i, stations_freqs[i][c], c);
		}
	}

	return 0;
}

Blessed is he who, in the name of charity and good will, shepherds the weak through the Valley of Darkness; for he is truly his brother's keeper, and the finder of lost children.
Ezekiel 25:17

[anonymous-root]

@ABUSE θα μπορούσες να γράφεις ελληνικά; Ευχαριστούμε. 



@ ΠΟΙΟΣ ΣΥΓΧΩΝΕΥΣΕ ΤΑ ΘΕΜΑΤΑ ΤΩΝ ΕΡΓΑΣΙΩΝ????

[SolidSNK]

Using stderr instead of stdout allows for unbuffered output (thus we use fprintf() instead of printf()). That's an explanation cause some people got really perplexed with this..

Y I already got that, u don't have to bang me in teh head...

What I liked most in ur code was the 'speed hack', I knew my code there was sloppy and needed smth like that to minimize the execution time

Where's ur frustrating 'constant-party' code now anywayz?

[^^DaRk_HunTeR]

btw memset()"should have a prototype" is not recognized by my compilers neither <unistd.h>"unable to open".....borland C++ (and dev C++)

[^^DaRk_HunTeR]

@ABUSE θα μπορούσες να γράφεις ελληνικά; Ευχαριστούμε. 



@ ΠΟΙΟΣ ΣΥΓΧΩΝΕΥΣΕ ΤΑ ΘΕΜΑΤΑ ΤΩΝ ΕΡΓΑΣΙΩΝ????

οι mods του topic προφανως

[Καμένος]

What one should do here is to create a pointer that each of its members will hold memories to other pointers.

Ναί.. κρατάει αναμνήσεις σε άλλους pointers.. Τι το παίζεις αμερικανάκι αφού δε τραβάει??

[Wanderer]

Αναμνήσεις μιας ζωής...για πάντα καταχωρημένοι...μέσα στη μεταβλητή...ποτέ μή δεσμευμένη