Init

a1/program.c

@@ -0,0 +1,92 @@
+#include <stdio.h>
+#include <string.h>
+
+#define MAX_LEN 101
+
+typedef struct {
+    char bracket;
+    int position;
+} StackItem;
+
+int is_opening(char ch) {
+    return ch == '(' || ch == '{' || ch == '[' || ch == '<';
+}
+
+int is_closing(char ch) {
+    return ch == ')' || ch == '}' || ch == ']' || ch == '>';
+}
+
+char matching_bracket(char ch) {
+    switch (ch) {
+        case ')': return '(';
+        case '}': return '{';
+        case ']': return '[';
+        case '>': return '<';
+        default: return 0;
+    }
+}
+
+char expected_closing(char ch) {
+    switch (ch) {
+        case '(': return ')';
+        case '{': return '}';
+        case '[': return ']';
+        case '<': return '>';
+        default: return 0;
+    }
+}
+
+void check_brackets(const char *line) {
+    StackItem stack[MAX_LEN];
+    int stack_top = -1;
+    
+    printf("Read: %s\n", line);
+
+    for (int i = 0; line[i] != '\0'; i++) {
+        char ch = line[i];
+
+        if (is_opening(ch)) {
+            if (stack_top < MAX_LEN - 1) {
+                stack[++stack_top].bracket = ch;
+                stack[stack_top].position = i;
+            } else {
+                printf("Error: Stack overflow\n");
+                return;
+            }
+        } else if (is_closing(ch)) {
+            if (stack_top == -1) {
+                printf("Unexpected closing bracket %c in %d\n", ch, i);
+                return;
+            } else if (stack[stack_top].bracket == matching_bracket(ch)) {
+                stack_top--;
+            } else {
+                printf("Crossed bracket %c in %d, expected %c \n", ch, i,
+                       expected_closing(stack[stack_top].bracket));
+                return;
+            }
+        }
+    }
+
+    if (stack_top >= 0) {
+        printf("Missing closing brackets:");
+        printf(" ");
+	while (stack_top >= 0) {
+            printf("%c", expected_closing(stack[stack_top].bracket));
+            stack_top--;
+        }
+        printf("\n");
+    } else {
+        printf("All brackets OK\n");
+    }
+}
+
+int main() {
+    char line[MAX_LEN];
+    if (fgets(line, sizeof(line), stdin)) {
+        line[strcspn(line, "\n")] = '\0';
+        check_brackets(line);
+    }
+    return 0;
+}
+
+

a4/program.c

@@ -0,0 +1,34 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+int is_heap(int* arr, int size ){
+    for(int i = 0; i < size; i++){
+        int l = i * 2 + 1;
+        int r = i * 2 + 2;
+    }
+    
+    if (l < size && arr[i] < arr[l]){
+        return 0;
+    }
+    
+    if (r < size && arr[i] < arr[r]){
+        return 0;
+    }
+    return 1;
+}
+
+int main() {
+    int arr[] = 100; 
+    int size = 0;
+    
+    while (scanf("%d", &num) != EOF){
+        arr[size++] = num;
+    }
+    
+    if (!is_heap(arr, size)){
+        printf("Nie je kopa.");
+    }
+    
+    return 0;
+}
+

cv1/program.c

@@ -0,0 +1,92 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+
+#define LINESIZE 100
+#define MENU_SIZE 100
+
+struct pizza {
+    char name[LINESIZE];
+    float price;
+};
+
+char hacker_script(char l) {
+    switch (l) {
+        case '0': return 'o';
+        case '1': return 'i';
+        case '2': return 'z';
+        case '3': return 'e';
+        case '4': return 'a';
+        case '5': return 's';
+        case '6': return 'b';
+        case '7': return 't';
+        case '8': return 'b';
+        case '9': return 'q';
+        default: return l;
+    }
+}
+
+void transform_to_hacker_script(const char *src, char *dest) {
+    while (*src) {
+        *dest++ = hacker_script(*src++);
+    }
+    *dest = '\0';
+}
+
+int contains_normalized(const char *name, const char *search) {
+    char transformed_name[LINESIZE], transformed_search[LINESIZE];
+    transform_to_hacker_script(name, transformed_name);
+    transform_to_hacker_script(search, transformed_search);
+
+    for (int i = 0; transformed_name[i]; i++) {
+        transformed_name[i] = tolower(transformed_name[i]);
+    }
+    for (int i = 0; transformed_search[i]; i++) {
+        transformed_search[i] = tolower(transformed_search[i]);
+    }
+
+    return strstr(transformed_name, transformed_search) != NULL;
+}
+
+int read_pizza(struct pizza *item) {
+    char line[LINESIZE];
+    if (!fgets(item->name, LINESIZE, stdin)) {
+        return 0;
+    }
+    item->name[strcspn(item->name, "\n")] = '\0';
+    if (!fgets(line, LINESIZE, stdin)) {
+        return 0;
+    }
+    item->price = strtof(line, NULL);
+    return 1;
+}
+
+int main() {
+    struct pizza menu[MENU_SIZE];
+    char search[LINESIZE];
+    int count = 0;
+
+    printf("Zadaj hladanu surovinu:\n");
+    if (!fgets(search, LINESIZE, stdin)) {
+        return 1;
+    }
+    search[strcspn(search, "\n")] = '\0';
+
+    printf("Zadaj jedalny listok:\n");
+    while (count < MENU_SIZE && read_pizza(&menu[count])) {
+        count++;
+    }
+
+    int found_count = 0;
+    for (int i = 0; i < count; i++) {
+        if (contains_normalized(menu[i].name, search)) {
+            printf("%s\n%.2f\n", menu[i].name, menu[i].price);
+            found_count++;
+        }
+    }
+
+
+    printf("Nacitanych %d poloziek.\n", count);
+    return 0;
+}

cv2/program.c

@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_NAME_LENGTH 100
+#define MAX_ITEMS 100
+
+typedef struct {
+    char name[MAX_NAME_LENGTH];
+    float price;
+} Pizza;
+
+int compare(const void *a, const void *b) {
+    Pizza *pizzaA = (Pizza *)a;
+    Pizza *pizzaB = (Pizza *)b;
+
+    if (pizzaA->price != pizzaB->price) {
+        return (pizzaA->price > pizzaB->price) - (pizzaA->price < pizzaB->price);
+    }
+    return strcasecmp(pizzaA->name, pizzaB->name);
+}
+
+int read_pizza_list(Pizza *menu) {
+    int count = 0;
+    char input[MAX_NAME_LENGTH];
+    
+    // Nacitame pizza
+    while (count < MAX_ITEMS && fgets(input, sizeof(input), stdin)) {
+        input[strcspn(input, "\n")] = 0; // Odstran znak noveho riadku
+        
+        // Nacitame cenu pizze
+        char price_str[10];
+        if (fgets(price_str, sizeof(price_str), stdin) == NULL) {
+            break;
+        }
+        
+        float price = atof(price_str);
+        if (price <= 0) {
+            break;
+        }
+        
+        strncpy(menu[count].name, input, MAX_NAME_LENGTH - 1);
+        menu[count].price = price;
+        count++;
+    }
+    return count;
+}
+
+int main() {
+    Pizza menu[MAX_ITEMS];
+    
+    int item_count = read_pizza_list(menu);
+    
+    qsort(menu, item_count, sizeof(Pizza), compare);
+    
+    for (int i = 0; i < item_count; i++) {
+        printf("%s\n%.6f\n", menu[i].name, menu[i].price);
+    }
+    
+    return 0;
+}

cv3/program.c

@@ -0,0 +1,105 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+
+#define STACK_SIZE 10
+
+struct stack {
+    float values[STACK_SIZE];
+    int size;
+};
+
+void print_stack(struct stack* s) {
+    for (int i = 0; i < s->size; i++) {
+        printf("%.2f", s->values[i]);
+        if (i < s->size - 1) {
+            printf(" ");
+        } else {
+            printf(" ");
+        }
+    }
+    printf("\n");
+}
+
+void push_stack(struct stack* s, float value) {
+    if (s->size >= STACK_SIZE) {
+        printf("full stack\n");
+        exit(0);
+    }
+    s->values[s->size++] = value;
+}
+
+float pop_stack(struct stack* s) {
+    if (s->size == 0) {
+        printf("empty stack\n");
+        exit(0);
+    }
+    return s->values[--s->size];
+}
+
+int is_operator(char* input) {
+    return (strcmp(input, "+") == 0 || strcmp(input, "-") == 0 ||
+            strcmp(input, "*") == 0 || strcmp(input, "/") == 0);
+}
+
+int is_valid_float(char* input) {
+    char* endptr;
+    strtod(input, &endptr);
+    return *endptr == '\0';
+}
+
+void perform_operation(struct stack* s, char* operator) {
+    if (s->size < 2) {
+        printf("not enough operands\n");
+        exit(0);
+    }
+
+    float b = pop_stack(s);
+    float a = pop_stack(s);
+    float result;
+
+    if (strcmp(operator, "+") == 0) {
+        result = a + b;
+    } else if (strcmp(operator, "-") == 0) {
+        result = a - b;
+    } else if (strcmp(operator, "*") == 0) {
+        result = a * b;
+    } else if (strcmp(operator, "/") == 0) {
+        if (b == 0) {
+            printf("division by zero\n");
+            exit(0);
+        }
+        result = a / b;
+    } else {
+        printf("Chyba: neplatna operacia\n");
+        exit(0);
+    }
+
+    push_stack(s, result);
+}
+
+int main() {
+    char input[100];
+    struct stack mystack;
+    mystack.size = 0;
+
+    while (fgets(input, sizeof(input), stdin) != NULL) {
+        input[strlen(input) - 1] = '\0';
+
+        if (is_valid_float(input)) {
+            float value = atof(input);
+            push_stack(&mystack, value);
+        } else if (is_operator(input)) {
+            perform_operation(&mystack, input);
+        } else {
+            printf("bad input\n");
+            return 0;
+        }
+
+        print_stack(&mystack);
+    }
+
+    printf("no input\n");
+    return 0;
+}

cv4/Makefile

@@ -0,0 +1,29 @@
+# Compiler and flags
+CC = gcc
+CFLAGS = -std=c99 -g -Wall
+
+# Source files and object files
+SRCS = main.c a_train.c
+OBJS = $(SRCS:.c=.o)
+
+# Target executable
+TARGET = main
+
+# Default rule to build the executable
+all: $(TARGET)
+
+# Rule to link object files and create the executable
+$(TARGET): $(OBJS)
+	$(CC) $(OBJS) -o $(TARGET)
+
+# Rule to compile .c files into .o files
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+# Clean up generated files
+clean:
+	rm -f $(OBJS) $(TARGET)
+
+# Phony targets (targets that are not actual files)
+.PHONY: all clean
+

cv4/a_train.c

@@ -0,0 +1,70 @@
+#include "a_train.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct car* add_car(struct car* first, const char* target) {
+    struct car* newcar = calloc(1, sizeof(struct car));
+    strcpy(newcar->value, target);
+    newcar->next = NULL;
+
+    if (first == NULL) {
+        first = newcar;
+    } else {
+        struct car* current = first;
+        while (current->next != NULL) {
+            current = current->next;
+        }
+        current->next = newcar;
+    }
+
+    return first;
+}
+
+void print_train(struct car* first) {
+    if(first != NULL){
+        struct car* current = first;
+        while(current != NULL){
+            printf("%s\n", current->value);
+            current = current->next;
+        }
+    }
+}
+
+void cancel_train(struct car* first) {
+    struct car* current = first;
+    while(first != NULL){
+        current = current->next;
+        free(first);
+        first = current;
+    }
+}
+
+struct car* clear_train(struct car* first, const char* target) {
+    if (first == NULL) {
+        return NULL;
+    }
+
+    struct car* current = first;
+    struct car* previous = NULL;
+
+    while (current != NULL && strcmp(current->value, target) == 0) {
+        struct car* temp = current;
+        first = current->next;
+        current = first;
+        free(temp);
+    }
+
+    while (current != NULL) {
+        if (strcmp(current->value, target) == 0) {
+            previous->next = current->next;
+            free(current);
+            current = previous->next;
+        } else {
+            previous = current;
+            current = current->next;
+        }
+    }
+
+    return first;
+}

cv4/a_train.h

@@ -0,0 +1,51 @@
+#ifndef TRAIN_H
+#define TRAIN_H
+#define SIZE 100
+
+/**
+ * Jeden vozen vlaku
+ */
+struct car {
+    /**
+     * Nazov cielovej  stanice
+     */
+    char value[SIZE];
+    /**
+     * Smenik na dalsi vozen
+     */
+    struct car* next;
+};
+
+/**
+ * Prida vozen na koniec vlaku.
+ *
+ * @arg nazov cielovej stanice, ktory sa ma priradit novemu voznu.
+ * @return smernik na zaciatok vlaku.
+ */
+struct car* add_car(struct car* first,const char* target);
+
+
+/**
+ * Vypise vsetky vozne vo vlaku
+ *
+ * @arg smernik na prvy vozen
+ */
+void print_train(struct car* first);
+
+/**
+ * Zrusenie vsetkych voznov vo vlaku.
+ * @arg smernik na prvy vozen
+ */
+void cancel_train(struct car* first);
+
+/**
+ * Vyradenie vsetkych voznov, ktorych cielova stanica je target
+ *
+ * @arg smernik na prvy vozen
+ * @arg cielova stanica, ktora sa ma vyradit z vlaku.
+ * @return smernik na novy prvy vozen
+ *
+ */
+struct car* clear_train(struct car* first,const char* target);
+
+#endif // TRAIN_H

cv4/main.c

@@ -0,0 +1,85 @@
+#include "a_train.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main() {
+    struct car* train = NULL;
+    int choice;
+    char station[100];
+    
+    while (1) {
+        printf("\nMenu:\n");
+        printf("1. Add station\n");
+        printf("2. Remove a station\n");
+        printf("3. Print route\n");
+        printf("4. Cancel train\n");
+        printf("5. Exit\n");
+        printf("Enter your choice: ");
+        scanf("%d", &choice);
+        getchar();
+        
+        switch(choice) {
+            case 1:
+                while (1) {
+                    printf("Enter the station name to add (or press Enter to stop): ");
+                    fgets(station, sizeof(station), stdin);
+                    station[strcspn(station, "\n")] = '\0';  // Remove newline character
+                    
+                    if (station[0] == '\0') {
+                        break;  // Exit the loop if input is empty
+                    }
+                    
+                    train = add_car(train, station);
+                    printf("Station '%s' added to the train.\n", station);
+                }
+                break;
+            case 2:
+                while (1) {
+                    printf("Enter the station name to clear (or press Enter to stop): ");
+                    fgets(station, sizeof(station), stdin);
+                    station[strcspn(station, "\n")] = '\0';  // Remove newline character
+                    
+                    if (station[0] == '\0') {
+                        break;  // Exit the loop if input is empty
+                    }
+                    
+                    struct car* temp = train;
+                    int found = 0;
+                    while (temp != NULL) {
+                        if (strcmp(temp->value, station) == 0) {
+                            found = 1;
+                            break;
+                        }
+                        temp = temp->next;
+                    }
+                    
+                    if (found) {
+                        train = clear_train(train, station);
+                        printf("Station '%s' deleted from the train.\n", station);
+                    } else {
+                        printf("Station '%s' does not exist in the train.\n", station);
+                    }
+                }
+                break;
+            case 3:
+                printf("\nRoute List:\n");
+                print_train(train);
+                break;
+            case 4:
+                printf("\nCanceling the train...\n");
+                cancel_train(train);
+                train = NULL;
+                break;
+            case 5:
+                printf("Exiting program...\n");
+                cancel_train(train);
+                return 0;
+            default:
+                printf("Invalid choice, please try again.\n");
+        }
+    }
+
+    return 0;
+}
+

cv6/Makefile

@@ -0,0 +1,13 @@
+CFLAGS= -std=c99 -g -Wall -Werror
+
+all: station
+
+%.o: %.c
+	gcc -c -o $@ $< $(CFLAGS)
+
+station: main.o a_station.o
+	gcc $(CFLAGS) main.o a_station.o -o station
+
+clean:
+	rm *.o station
+

cv6/a_station.c

@@ -0,0 +1,93 @@
+#include <stdio.h>
+#include "a_station.h"
+#include <stdlib.h>
+#include <string.h>
+
+struct station* create_station(){
+   struct station* station = (struct station*)calloc(1,sizeof(struct station));
+   station->tracks = (struct car**)calloc(STATION_SIZE, sizeof(struct car*));
+   station->track_count = STATION_SIZE;
+   return station;
+}
+
+void destroy_station(struct station* station){
+    for (int i = 0; i < station->track_count; i++) {
+        struct car* current = station->tracks[i];
+        while (current) {
+            struct car* temp = current;
+            current = current->next;
+            free(temp);
+        }
+    }
+    free(station->tracks);
+    free(station);
+}
+
+int select_track(struct station* station, const char* target){
+    size_t length = strlen(target);
+    int sum = 0;
+    for (size_t i = 0; i < length; i++) {
+        sum += target[i];
+    }
+    return sum % station->track_count;
+}
+
+void add_target_capacity(struct station* station,const char* target, int capacity){
+    int track = select_track(station, target);
+    struct car* current = station->tracks[track];
+
+    while (current) {
+        if (strcmp(current->value, target) == 0) {
+            current->capacity += capacity;
+            return;
+        }
+        current = current->next;
+    }
+
+    struct car* new_car = malloc(sizeof(struct car));
+    strncpy(new_car->value, target, TARGET_SIZE - 1);
+    new_car->value[TARGET_SIZE - 1] = '\0';
+    new_car->capacity = capacity;
+    new_car->next = station->tracks[track];
+    station->tracks[track] = new_car;
+}
+
+int get_target_capacity(struct station* station, const char* target) {
+    int track = select_track(station, target);
+    struct car* current = station->tracks[track];
+
+    while (current) {
+        if (strcmp(current->value, target) == 0) {
+            return current->capacity;
+        }
+        current = current->next;
+    }
+
+    return 0;
+}
+
+int count_targets(struct station* station) {
+    int count = 0;
+    for (int i = 0; i < station->track_count; i++) {
+        struct car* current = station->tracks[i];
+        while (current) {
+            count++;
+            current = current->next;
+        }
+    }
+    return count;
+}
+
+int count_capacity(struct station* station) {
+    int total_capacity = 0;
+    for (int i = 0; i < station->track_count; i++) {
+        struct car* current = station->tracks[i];
+        while (current) {
+            total_capacity += current->capacity;
+            current = current->next;
+        }
+    }
+    return total_capacity;
+}
+
+

cv6/a_station.h

@@ -0,0 +1,91 @@
+#ifndef STATION_H
+#define STATION_H
+// Pocet trati k dispozicii
+#define STATION_SIZE 10
+// Maximalny pocet znakov pre ulozenie nazvu cielovej stanice
+#define TARGET_SIZE 36
+
+/**
+ * Jeden zaznam o kapacite do cielovej stanice
+ */
+struct car {
+    // Cielova stanica / nazov
+    char value[TARGET_SIZE];
+    // Pocet cestujuchich
+    int capacity;
+    // Smernik na dalsi zaznam
+    struct car* next;
+};
+
+/**
+ * Cela databaza zaznamov
+ */
+struct station {
+    // Dynamicke pole smernikov na zaznamy
+    // jeden zaznam ma typ struct car*
+    struct car** tracks;
+    // Velkost pola tracks
+    int track_count;
+};
+
+
+/**
+ * Vytvori prazdnu stanicu.
+ * Alokuje pole smernikov tracks na pociatocnu kapacitu STATION_SIZE
+ * nastavi velkost capacity na STATION_SIZE
+ * @return smernik na prazdnu stanicu
+ */
+struct station* create_station();
+
+/**
+ * Uvolni pamat
+ * @param smernik na databazu
+ */
+void destroy_station(struct station* station);
+
+/**
+ * Vyberie poziciu v poli station->tracks pre ulozenie zaznamu target
+ *
+ * Proces vyberu by mal splnat kriteria pre hash funkciu:
+ * - rovnaky retazec by mal vzdy mat rovnaky vysledok
+ * - pre rozne retazce by mali byt vysledky co najviac rozne
+ *
+ * @param smernik na databazu
+ * @param nazov cielovej stanice
+ * @return cislo v intervale 0 az N-1, kde N je  station->track_count
+ */
+int select_track(struct station* station, const char* target);
+
+/**
+ * Zvysi zaznam o pocte cestujucich do danej cielovej stanice.
+ *
+ * Najprv sa vyberie cielova trat pomocou select_track(). Ak zaznam neexistuje, 
+ * vytvori sa novy. Ak zaznam na danej trati (spojkovom zozname) existuje, cislo sa pripocita.
+ * V databaze nesmu byt dva zaznamy s rovnakou cielovou stanicou.
+ *
+ * @param smernik na databazu
+ * @param nazov cielovej stanice
+ */
+void add_target_capacity(struct station* station,const char* target, int capacity);
+
+/**
+ * Ziska zaznam o cielovej stanici.
+ * @param smernik na databazu
+ * @param nazov cielovej stanice
+ *
+ * @return kapacitu do cielovej stanice. Ak sa zaznam nenachedza, vrati nula.
+ */
+int get_target_capacity(struct station* station,const char* target);
+
+/**
+ * Spocita pocet cielovych stanic
+ * @param smernik na databazu
+ */
+int count_targets(struct station* station);
+
+/**
+ * Spocita kapacitu vo vsetkych zaznamoch
+ * @param smernik na databazu
+ */
+int count_capacity(struct station* station);
+#endif

cv6/main.c

@@ -0,0 +1,53 @@
+#include "a_station.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define MAX_INPUT 100
+
+void test_station(struct station* station) {
+    char station_name[MAX_INPUT];
+    int capacity;
+
+    while (1) {
+	printf("Enter station name and capacity (or 'exit' to stop):\n");
+        printf("Station name: ");
+        if (!fgets(station_name, MAX_INPUT, stdin)) break;
+
+        // Remove trailing newline
+        station_name[strcspn(station_name, "\n")] = '\0';
+
+        if (strcmp(station_name, "exit") == 0) break;
+
+        printf("Capacity: ");
+        if (scanf("%d", &capacity) != 1) {
+            printf("Invalid input. Try again.\n");
+            while (getchar() != '\n'); // Clear input buffer
+            continue;
+        }
+
+        // Clear input buffer
+        while (getchar() != '\n');
+
+        add_target_capacity(station, station_name, capacity);
+
+        int track = select_track(station, station_name);
+        printf("Track for %s: %d\n", station_name, track);
+
+        int current_capacity = get_target_capacity(station, station_name);
+        printf("Current capacity to %s: %d\n\n", station_name, current_capacity);
+    }
+
+    printf("Final Statistics:\n");
+    printf("Total number of targets: %d\n", count_targets(station));
+    printf("Total capacity: %d\n", count_capacity(station));
+}
+
+int main() {
+    struct station* station = create_station();
+    test_station(station);
+    destroy_station(station);
+
+    return 0;
+}
+

cv7/program.c

@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define SIZE 100
+
+struct tree {
+    char value[SIZE];
+    struct tree* left;
+    struct tree* right;
+};
+
+struct tree* read_tree() {
+    char buffer[SIZE];
+    memset(buffer, 0, SIZE);
+    char* r = fgets(buffer, SIZE, stdin);
+    if (!r || buffer[0] == '\n') {
+        return NULL;
+    }
+    buffer[strcspn(buffer, "\n")] = 0;
+    struct tree* node = calloc(1, sizeof(struct tree));
+    strncpy(node->value, buffer, SIZE - 1);
+    return node;
+}
+
+struct tree* load_tree() {
+    struct tree* node = read_tree();
+    if (!node) {
+        return NULL;
+    }
+    if (node->value[0] != '*') {
+        node->left = load_tree();
+        node->right = load_tree();
+    } else if (node->left != NULL || node->right != NULL) {
+        printf("Chybna databaza\n");
+        free(node);
+        return NULL;
+    }
+    return node;
+}
+
+void run_tree(struct tree* tree) {
+    if (!tree) {
+        return;
+    }
+
+    if (tree->value[0] == '*') {
+        printf("*%s\nKoniec\n", tree->value + 1);
+        return;
+    }
+
+    printf("%s\n", tree->value);
+
+    char response;
+    if (scanf(" %c", &response) != 1) {
+        printf("Koniec vstupu\n");
+        return;
+    } else if (response != 'a' && response != 'n') {
+        printf("Nerozumiem\n");
+        return;
+    }
+
+    if (response == 'a') {
+        run_tree(tree->left);
+    } else {
+        run_tree(tree->right);
+    }
+}
+
+void destroy_tree(struct tree* tree) {
+    if (tree) {
+        destroy_tree(tree->left);
+        destroy_tree(tree->right);
+        free(tree);
+    }
+}
+
+void count_items(struct tree* tree, int* count) {
+    if (tree) {
+        if (tree->left == NULL && tree->right == NULL) {
+            (*count)++;
+        } else {
+            count_items(tree->left, count);
+            count_items(tree->right, count);
+        }
+    }
+}
+
+int main() {
+    struct tree* root = load_tree();
+    
+    printf("Expert z bufetu to vie.\n");
+
+    if (!root) {
+        printf("Chybna databaza\n");
+        return 0;
+    }
+
+
+    int count = 0;
+    count_items(root, &count);
+    printf("Pozna %d druhov ovocia a zeleniny.\n", count);
+    printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.\n");
+
+    run_tree(root);
+
+    destroy_tree(root);
+    return 0;
+}

sk1/Makefile

@@ -0,0 +1,18 @@
+CC = gcc
+CFLAGS = -Wall -Wextra -std=c11
+TARGET = compressor
+
+all: $(TARGET)
+
+$(TARGET): main.o compressor.o
+	$(CC) $(CFLAGS) -o $(TARGET) main.o compressor.o
+
+main.o: main.c compressor.h
+	$(CC) $(CFLAGS) -c main.c
+
+compressor.o: compressor.c compressor.h
+	$(CC) $(CFLAGS) -c compressor.c
+
+clean:
+	rm -f *.o $(TARGET)
+

sk1/compressed.txt

@@ -0,0 +1,11 @@
+0-A
+0-n
+0-t
+0-o
+2- 
+0-K
+4-z
+0-a
+0-r
+0-
+

sk1/compressor.c

@@ -1,43 +1,64 @@
+#include "compressor.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <stdbool.h>
+#include <stddef.h>
 
-#define BUFFER_SIZE 1024
-#define LZ78_DICT_SIZE 256
+// Trie (prefix tree) structure for LZ78 compression
+struct dict {
+    int index;
+    struct dict* characters[LZ78_DICT_SIZE];
+};
 
-// Function prototypes
-int compress(const char* input_file_name, const char* output_file_name);
-int decompress(const char* input_file_name, const char* output_file_name);
-void lz78_compress(FILE* in, FILE* out);
-void lz78_decompress(FILE* in, FILE* out);
-
-void print_usage() {
-    printf("Usage:\n");
-    printf("  ./compressor -c infile outfile   Compress infile into outfile\n");
-    printf("  ./compressor -d compressed uncompressed   Decompress compressed into uncompressed\n");
+// Free the dictionary trie
+void delete_dict(struct dict* tree) {
+    if (!tree) {
+        return;
+    }
+    for (int i = 0; i < LZ78_DICT_SIZE; i++) {
+        delete_dict(tree->characters[i]);
+    }
+    free(tree);
 }
 
-int main(int argc, char* argv[]) {
-    if (argc != 4) {
-        print_usage();
-        return 1;
+// LZ78 Compression
+void lz78_compress(FILE* in, FILE* out) {
+    struct dict* root = calloc(1, sizeof(struct dict));
+    struct dict* current = root;
+    int index = 1;
+    int c;
+
+    while ((c = fgetc(in)) != EOF) {
+        if (current->characters[c]) {
+            current = current->characters[c];
+        } else {
+            current->characters[c] = calloc(1, sizeof(struct dict));
+            current->characters[c]->index = index++;
+            fprintf(out, "%d-%c\n", current->index, c);
+            current = root;
+        }
     }
 
-    const char* mode = argv[1];
-    const char* infile = argv[2];
-    const char* outfile = argv[3];
+    delete_dict(root);
+}
 
-    if (strcmp(mode, "-c") == 0) {
-        return compress(infile, outfile);
-    } else if (strcmp(mode, "-d") == 0) {
-        return decompress(infile, outfile);
-    } else {
-        print_usage();
-        return 1;
+// LZ78 Decompression
+void lz78_decompress(FILE* in, FILE* out) {
+    char buffer[LZ78_DICT_SIZE][BUFFER_SIZE] = {""};
+    int index, dict_index = 1;
+    char c;
+
+    while (fscanf(in, "%d-%c\n", &index, &c) == 2) {
+        if (index > 0) {
+            fprintf(out, "%s", buffer[index]);
+        }
+        fputc(c, out);
+        snprintf(buffer[dict_index], BUFFER_SIZE, "%s%c", buffer[index], c);
+        dict_index++;
     }
 }
 
+// Compress function
 int compress(const char* input_file_name, const char* output_file_name) {
     FILE* input_file = fopen(input_file_name, "rb");
     if (!input_file) {
@@ -61,6 +82,7 @@ int compress(const char* input_file_name, const char* output_file_name) {
     return 0;
 }
 
+// Decompress function
 int decompress(const char* input_file_name, const char* output_file_name) {
     FILE* input_file = fopen(input_file_name, "rb");
     if (!input_file) {
@@ -84,54 +106,3 @@ int decompress(const char* input_file_name, const char* output_file_name) {
     return 0;
 }
 
-// LZ78 compression
-struct dict {
-    int index;
-    struct dict* characters[LZ78_DICT_SIZE];
-};
-
-void delete_dict(struct dict* tree) {
-    if (!tree) {
-        return;
-    }
-    for (int i = 0; i < LZ78_DICT_SIZE; i++) {
-        delete_dict(tree->characters[i]);
-    }
-    free(tree);
-}
-
-void lz78_compress(FILE* in, FILE* out) {
-    struct dict* root = calloc(1, sizeof(struct dict));
-    struct dict* current = root;
-    int index = 1;
-    int c;
-
-    while ((c = fgetc(in)) != EOF) {
-        if (current->characters[c]) {
-            current = current->characters[c];
-        } else {
-            current->characters[c] = calloc(1, sizeof(struct dict));
-            current->characters[c]->index = index++;
-            fprintf(out, "%d-%c\n", current->index, c);
-            current = root;
-        }
-    }
-
-    delete_dict(root);
-}
-
-// LZ78 decompression
-void lz78_decompress(FILE* in, FILE* out) {
-    char buffer[LZ78_DICT_SIZE][BUFFER_SIZE] = {""};
-    int index;
-    char c;
-
-    while (fscanf(in, "%d-%c\n", &index, &c) == 2) {
-        if (index > 0) {
-            fprintf(out, "%s", buffer[index]);
-        }
-        fputc(c, out);
-        snprintf(buffer[index], BUFFER_SIZE, "%s%c", buffer[index], c);
-    }
-}
-

sk1/compressor.h

@@ -8,4 +8,3 @@ int compress(const char* input_file_name, const char* output_file_name);
 int decompress(const char* input_file_name, const char* output_file_name);
 
 #endif // COMPRESSOR_H
-

sk1/input.txt

@@ -0,0 +1 @@
+Anton Kozar

sk1/main.c

@@ -0,0 +1,30 @@
+#include "compressor.h"
+#include <stdio.h>
+#include <string.h>
+
+void print_usage() {
+    printf("Usage:\n");
+    printf("  ./compressor -c infile outfile   Compress infile into outfile\n");
+    printf("  ./compressor -d compressed uncompressed   Decompress compressed into uncompressed\n");
+}
+
+int main(int argc, char* argv[]) {
+    if (argc != 4) {
+        print_usage();
+        return 1;
+    }
+
+    const char* mode = argv[1];
+    const char* infile = argv[2];
+    const char* outfile = argv[3];
+
+    if (strcmp(mode, "-c") == 0) {
+        return compress(infile, outfile);
+    } else if (strcmp(mode, "-d") == 0) {
+        return decompress(infile, outfile);
+    } else {
+        print_usage();
+        return 1;
+    }
+}
+

sk1/output.txt

@@ -0,0 +1 @@
+Anton Kozar