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This commit is contained in:
Damián Korpesio 2022-01-19 22:29:10 +01:00
parent d29e995d9a
commit 57b6d692fd
6 changed files with 356 additions and 84 deletions
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11
sk1a/main.c
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@ -10,16 +10,15 @@ void print_solution(char* matrix,int sz){
printf("\n");
}
}
}
int main(){
char tmaze[SZ+1][SZ+1]={
"*x ",
" xx ",
" x ",
" x ",
" ",
"*x ",
" x ",
" x ",
" x ",
" ",
};
char maze[SZ*SZ];
memset(maze,' ',SZ*SZ);

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sk1a/main.o
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145
sk1a/maze.c
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@ -3,86 +3,75 @@
#include "maze.h"
#include <assert.h>
int solve_maze(char* maze,int size) {
int i = 0;
int p, l, h, d = 0;
while(i != size*size-1){
//if (i % size - 1 != 0){l = 1;}
//else if (i < size*size - size){h = 1;}
//else if (i % size){p = 1;}
//else if (i >= size){d =1;}
if (maze[i + 1] == ' ' /*&& i % size - 1 != 0 */&& l != 1) {
maze[i + 1] = '*';
i++;
p = 0;
l = 0;
h = 0;
d = 0;
} else if (maze[i + size] == ' ' /*&& i < (size*size - size) != 0 */&& h != 1) {
maze[i + size] = '*';
i = i + size;
p = 0;
l = 0;
h = 0;
d = 0;
} else if (maze[i - 1] == ' ' /*&& i % size != 0 */&& p != 1) {
maze[i - 1] = '*';
i--;
p = 0;
l = 0;
h = 0;
d = 0;
} else if (maze[i - size] == ' ' /*&& i >= size */&& d != 1) {
maze[i - size] = '*';
i = i - size;
p = 0;
l = 0;
h = 0;
d = 0;
int issafe(char* maze, int x, int y, int size) {
if ((x >= 0 && x < size) && (y >= 0 && y < size) && maze[x * size + y] == ' '){
return 1;
}
return 0;
}
int backtracking(char* maze, int x, int y, int size){
if(x == size - 1 && y == size - 1 && maze[x * size + y] == ' '){
maze[x * size + y] = '*';
return 1;
}
if(issafe(maze, x, y, size) == 1) {
maze[x * size + y] = '*';
if (backtracking(maze, x, y + 1, size) == 1) {
return 1;
}
if (backtracking(maze, x + 1, y, size) == 1) {
return 1;
}
if (backtracking(maze, x - 1, y, size) == 1) {
return 1;
}
if (backtracking(maze, x, y - 1, size) == 1) {
return 1;
}
maze[x * size + y] = ' ';
}
return 0;
}
int solve_maze(char* maze, int size) {
if (maze[0] == '*'){
assert(maze[0] == '*');
maze[0] = ' ';
}
int x,y = 0;
while(x * size + y <= size*size - 1 ){
printf("%d\n%d", x * size + y, y);
//issafe(maze, x, y, size);
if (maze[x * size + y + 1] == ' ' /*&& y != 5*/){
assert(maze[x * size + y + 1] == ' ');
maze[x * size + y + 1] = '*';
y++;
}
if (maze[(x + 1) * size + y] == ' ' /*&& x != 5*/){
assert(maze[(x + 1) * size + y] == ' ');
maze[(x + 1) * size + y] = '*';
x++;
}
if (maze[x * size + y - 1] == ' ' && y != 0){
assert(maze[x * size + y - 1] == ' ');
maze[x * size + y - 1] = '*';
y--;
}
if (maze[(x - 1) * size + y] == ' ' /*&& x != 0*/){
assert(maze[(x - 1) * size + y] == ' ');
maze[(x - 1) * size + y] = '*';
x--;
}
else{
while(1){
if (maze[i + 1] == ' ' && i != size - 1 && l != 1) {
//i++;
break;
}
if (maze[i + size] == ' ' && i != size - 1 && h != 1) {
//i = i + size;
break;
}
if (maze[i - 1] == ' ' && i != 0 && p != 1) {
//i--;
break;
}
if (maze[i - size] == ' ' && i > size && d != 1) {
//i = i - size;
break;
}
p = 0;
l = 0;
h = 0;
d = 0;
if (maze[i + 1] == '*' && i != size - 1) {
maze[i] = ' ';
i++;
p = 1;
} else if (maze[i + size] == '*' && i != size - 1) {
maze[i] = ' ';
i = i + size;
d = 1;
} else if (maze[i - 1] == '*' && i != 0) {
maze[i] = ' ';
i--;
l = 1;
} else if (maze[i - size] == '*' && i > size) {
maze[i] = ' ';
i = i - size;
h = 1;
}
}
backtracking(maze,x , y, size);
}
}
maze[0] = '*';
return 1;
return 1;
}

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sk1a/maze.o
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sk1a/program
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284
sk2a/readme.md Normal file
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@ -0,0 +1,284 @@
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "compressor.h"
#define BUFSIZE 1024
#define SIZE 256
#define MAX_WORDS 100000
// One codeword is previous index - new index -character
// Trie (a.k.a prefix tree)
struct dict {
int index;
// Character is encoded as non zero value in characters
struct dict* characters[SIZE];
};
// Free trie
void delete(struct dict* tree){ //skopirovane z lz78, vymaze strukturu co sa pouziva v lz78
if (tree == NULL){ //maze to pamat stromu
return;
}
for (int i = 0 ;i < SIZE; i++){
delete(tree-> characters[i]);
}
free(tree);
}
void get_words (struct dict* tree,char* words[]){ //posielam cely strom a smernik na dvojrozmerne pole
if (tree == NULL){
return;
}
for (int i = 0 ;i < SIZE; i++){ //prejdeme vsetkych potomkov
if (tree-> characters[i] > 0){ //zistime ci tam je nieco naalokovane
int need_size = snprintf(NULL,0,"-%d-%c\n",tree->index,i); //kolko pamate
words[tree->characters[i]->index] = calloc(need_size + 1,sizeof(char)); //naalokujeme pamat
memset(words[tree->characters[i]->index],0,need_size + 1);
sprintf(words[tree->characters[i]->index],"-%d-%c\n",tree->index,i); //napise sa vo formate -index predosleho notu - aktualny znak
get_words(tree-> characters[i],words); //zavolam na kazdeho potomka a potom na dalsich potomkov alebo syna
}
}
}
int mylz78compress(char* buff,int size,char** outbuf){
// https://medium.com/@dbudhrani/how-data-compression-works-exploring-lz78-e97e539138
// The trie represents the current phrase
// The first node represents the empty string with index 0
struct dict* root = calloc(1,sizeof(struct dict));
struct dict* current = root;
int index = 1;
int c = 0;
char *last = NULL;
for(int i = 0; i < size; i++){
c = buff[i];
// Current character is in dictionary, continue searching
if (current->characters[c] > 0){
// ak este nieco ostalo a toto je koniec
if (i == size - 1){ // pridem na koniec suboru a musim si to zapamatat, inac to stratim
int sz_needed = snprintf(NULL,0,"-%d-%c\n",current->index,c); //kolko bajtov to bude zaberat
last = calloc(sz_needed + 1,sizeof(char)); //alokuje do do last
sprintf(last,"-%d-%c\n",current->index,c); //
}
current = current->characters[c];
}
else {
current->characters[c] = calloc(1,sizeof(struct dict));
current->characters[c]->index = index;
index += 1;
current = root;
}
}
char **words = calloc(index,sizeof(char*)); // z stromu vytvori format
get_words(root,words);
int size_needed = 0;
for(int i=1; i < index; i++){ //nastavime velkost aku bude mat vystupny buffer
if(words[i] != NULL){
size_needed += strlen(words[i]); //poscitavame velkosti vsetkych stringov
}
}
if (last != NULL){ //mame string last?
size_needed += strlen(last); //priratam
}
char *temp = calloc(size_needed + 10,sizeof(char)); //alokujem velkost, padalo mi to ked som mal mensie cislo ako 10
int pos = 0; //pamatam kde som to uz vypisal
for(int i=0; i < index; i++){
if (words[i] != NULL){
strcpy(temp + pos,words[i]); //nebude sa to pisat na zaciatok ale az za tym
pos += strlen(words[i]);
}
}
if (last != NULL){ // zapisem aj last
strcpy(temp + pos,last);
pos += strlen(last);
}
delete(root); //nepotrebujeme strom, uvolnime pamat
free(words);
*outbuf = temp; //adresa sa zapise do outbuffer
return strlen(temp);
}
int myrlcompress(char* buff,int size,char** outbuf){
// 2 * size je urcite dost, kedze v najhorsom pripade bude kazdy znak osamote
*outbuf = calloc(2 * size + 1,sizeof(char)); //smernik na smernik, napisem adresu novej pamate
memset(*outbuf,0,size + 1); //vymaze
int head = -1;
int length = 0;
int pos = 0;
for(int i = 0; i < size; i++){
int c = buff[i];
if (c == head){
length += 1;
if (i == size - 1){ //posledne pismenko
(*outbuf)[pos] = head;
(*outbuf)[pos + 1] = length;
pos += 2; //aby som vedel kde to zapisovat
break;
}
}
else {
if (head != -1){
(*outbuf)[pos] = head;
(*outbuf)[pos + 1] = length;
pos += 2;
}
if (i == size - 1){ //posledne pismenko
(*outbuf)[pos] = c;
(*outbuf)[pos + 1] = 1;
pos += 2;
break;
}
head = c;
length = 1;
}
// ak sme blizko preteceniu, vypiseme aktualny znak
if (length == 255){ //nemozme ist viac, vynulujem a idem od nuly
(*outbuf)[pos] = head;
(*outbuf)[pos + 1] = length;
pos += 2;
head = -1;
length = 0;
}
}
return pos; //velkost vystupneho buffera
}
void compress(FILE* infile,FILE* outfile){
fseek(infile, 0, SEEK_END); //vstupny subor, a chceme presunut kurzor na konci suboru
int insize = ftell(infile) + 1; // na akej pozicii je kurzor, zistime velkost suboru
rewind(infile); //vrati kurzor na zaciatok
char *buffer = calloc(insize,sizeof(char)); //alokuje pamat
memset(buffer,0,insize);
insize = fread(buffer,sizeof(char),insize - 1,infile); //nacita obsah do bufferu
if (insize == 0){
assert(!ferror(infile));
}
char *tempbuf = NULL; // az vo funkcii to alokujem
int tempsize = myrlcompress(buffer,insize,&tempbuf); //vstupny buffer, velkost a adresu bufferu
char *outbuf = NULL;
int outsize = mylz78compress(tempbuf,tempsize,&outbuf);
if (outsize > 0){
fwrite(outbuf,sizeof(char),outsize,outfile); //napise sa do suboru, z akeho buffera do akeho suboru
}
free(buffer);
free(tempbuf);
free(outbuf);
}
int myrldecompress(char* buff,int size,char** outbuf){
*outbuf = calloc(size + 1,sizeof(char));
memset(*outbuf,0,size + 1);
int pos = 0;
for(int i = 0; i < size; i+=2){
char c = buff[i];
char length = buff[i + 1];
// ak nam nebude stacit miesto v *outbuf, treba allocovat viac
while((length + pos) > (size - 1)){
size *= 2;
char *tempbuf = calloc(size,sizeof(char));
memset(tempbuf,'\0',size);
strcpy(tempbuf,*outbuf);
free(*outbuf);
*outbuf = tempbuf;
}
for (int j = 0; j < length; j++){ //tolko krat ho pridavam, kolko mam cisielko
(*outbuf)[pos] = c;
pos += 1;
}
}
return pos;
}
int mylz78decompress(char* buff,int size,char** outbuf){ //nepotrebujem pouzivat strom
*outbuf = calloc(size,sizeof(char)); //taka ista velkost ako vstup
memset(*outbuf,0,size);
char *words[MAX_WORDS]; //dvojrozmerne pole
words[0] = "";
char c;
int index = 1;
int number;
int pos = 0;
int bytes_read, bytes_read_all = 0; //citame vstupny buffer, necitame po bajtoch, viac ciferne cisla
while (sscanf(buff + bytes_read_all,"-%d-%c\n%n",&number,&c,&bytes_read) == 2){ //formatovacie citanie, pusaveme o bajty, ktore sa precitali ak vrati ine cislo ako 2 tak je nakocni
bytes_read_all += bytes_read; //o tolko sme sa posunuli
words[index] = calloc(strlen(words[number]) + 2,sizeof(char*)); //vo words sa vytvoria prefixi
strcpy(words[index],words[number]); //nakopirujeme words number a pridame nakoniec c
words[index][strlen(words[number])] = c;
// ak nam nebude stacit miesto v *outbuf, treba allocovat viac
while((strlen(words[index]) + pos) > (size - 1)){
size *= 2;
char *tempbuf = calloc(size,sizeof(char));
memset(tempbuf,'\0',size);
strcpy(tempbuf,*outbuf);
free(*outbuf);
*outbuf = tempbuf;
}
strcpy(*outbuf + pos,words[index]); //nakopiruje najnovsie slovo
pos += strlen(words[index]);
index += 1;
}
return strlen(*outbuf); //vratim velkost
}
void decompress(FILE* infile,FILE* outfile){
fseek(infile, 0, SEEK_END);
int insize = ftell(infile) + 1;
rewind(infile);
char *buffer = calloc(insize,sizeof(char));
memset(buffer,0,insize);
insize = fread(buffer,sizeof(char),insize - 1,infile);
if (insize == 0){
assert(!ferror(infile));
}
char *tempbuf = NULL;
int tempsize = mylz78decompress(buffer,insize,&tempbuf); //najprv lz78
char *outbuf = NULL;
int outsize = myrldecompress(tempbuf,tempsize,&outbuf);
if (outsize > 0){
fwrite(outbuf,sizeof(char),outsize,outfile);
}
free(buffer);
free(tempbuf);
free(outbuf);
}