From b6150ab95ceb736c43fbcd0371e3a2b6916d781c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Slobodan=20Jeli=C4=87?= <sjelic@grf.bg.ac.rs>
Date: Tue, 24 Dec 2024 16:23:07 +0100
Subject: [PATCH] pc

---
 .vscode/settings.json   |   3 +-
 example1.txt            | 501 ++++++++++++++++++++++++++++++++++++++++
 include/random_graph.h  |   1 +
 include/random_groups.h |  16 ++
 src/main.c              |  18 +-
 src/random_groups.c     |  87 +++++++
 6 files changed, 624 insertions(+), 2 deletions(-)
 create mode 100644 example1.txt
 create mode 100644 include/random_groups.h
 create mode 100644 src/random_groups.c

diff --git a/.vscode/settings.json b/.vscode/settings.json
index 9ed3626..9d395b2 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,5 +1,6 @@
 {
     "files.associations": {
-        "random_graph.h": "c"
+        "random_graph.h": "c",
+        "random_groups.h": "c"
     }
 }
\ No newline at end of file
diff --git a/example1.txt b/example1.txt
new file mode 100644
index 0000000..4cb9f90
--- /dev/null
+++ b/example1.txt
@@ -0,0 +1,501 @@
+Generated graph edges:
+Edge 0 -> 2
+Edge 0 -> 3
+Edge 0 -> 7
+Edge 0 -> 11
+Edge 0 -> 16
+Edge 0 -> 17
+Edge 0 -> 25
+Edge 0 -> 28
+Edge 0 -> 29
+Edge 0 -> 30
+Edge 0 -> 32
+Edge 0 -> 33
+Edge 0 -> 34
+Edge 0 -> 37
+Edge 0 -> 42
+Edge 0 -> 43
+Edge 0 -> 52
+Edge 0 -> 59
+Edge 1 -> 5
+Edge 1 -> 6
+Edge 1 -> 11
+Edge 1 -> 13
+Edge 1 -> 18
+Edge 1 -> 20
+Edge 1 -> 23
+Edge 1 -> 29
+Edge 1 -> 35
+Edge 1 -> 36
+Edge 1 -> 45
+Edge 1 -> 53
+Edge 1 -> 54
+Edge 1 -> 57
+Edge 1 -> 58
+Edge 1 -> 59
+Edge 2 -> 3
+Edge 2 -> 8
+Edge 2 -> 11
+Edge 2 -> 13
+Edge 2 -> 16
+Edge 2 -> 26
+Edge 2 -> 27
+Edge 2 -> 29
+Edge 2 -> 30
+Edge 2 -> 31
+Edge 2 -> 32
+Edge 2 -> 36
+Edge 2 -> 41
+Edge 2 -> 43
+Edge 2 -> 45
+Edge 2 -> 46
+Edge 2 -> 48
+Edge 2 -> 50
+Edge 2 -> 52
+Edge 3 -> 6
+Edge 3 -> 18
+Edge 3 -> 19
+Edge 3 -> 21
+Edge 3 -> 23
+Edge 3 -> 25
+Edge 3 -> 28
+Edge 3 -> 38
+Edge 3 -> 39
+Edge 3 -> 41
+Edge 3 -> 42
+Edge 3 -> 43
+Edge 3 -> 54
+Edge 3 -> 57
+Edge 4 -> 5
+Edge 4 -> 7
+Edge 4 -> 8
+Edge 4 -> 12
+Edge 4 -> 13
+Edge 4 -> 14
+Edge 4 -> 16
+Edge 4 -> 17
+Edge 4 -> 21
+Edge 4 -> 25
+Edge 4 -> 30
+Edge 4 -> 33
+Edge 4 -> 35
+Edge 4 -> 42
+Edge 4 -> 43
+Edge 4 -> 45
+Edge 4 -> 48
+Edge 4 -> 51
+Edge 4 -> 54
+Edge 4 -> 59
+Edge 5 -> 10
+Edge 5 -> 12
+Edge 5 -> 13
+Edge 5 -> 16
+Edge 5 -> 17
+Edge 5 -> 30
+Edge 5 -> 36
+Edge 5 -> 43
+Edge 5 -> 47
+Edge 5 -> 48
+Edge 5 -> 49
+Edge 5 -> 51
+Edge 5 -> 54
+Edge 5 -> 59
+Edge 6 -> 7
+Edge 6 -> 8
+Edge 6 -> 9
+Edge 6 -> 11
+Edge 6 -> 14
+Edge 6 -> 17
+Edge 6 -> 20
+Edge 6 -> 21
+Edge 6 -> 34
+Edge 6 -> 35
+Edge 6 -> 37
+Edge 6 -> 41
+Edge 6 -> 51
+Edge 6 -> 54
+Edge 6 -> 56
+Edge 6 -> 57
+Edge 6 -> 59
+Edge 7 -> 9
+Edge 7 -> 13
+Edge 7 -> 14
+Edge 7 -> 16
+Edge 7 -> 30
+Edge 7 -> 35
+Edge 7 -> 39
+Edge 7 -> 40
+Edge 7 -> 43
+Edge 7 -> 46
+Edge 7 -> 47
+Edge 7 -> 48
+Edge 7 -> 49
+Edge 8 -> 9
+Edge 8 -> 10
+Edge 8 -> 17
+Edge 8 -> 20
+Edge 8 -> 24
+Edge 8 -> 27
+Edge 8 -> 30
+Edge 8 -> 32
+Edge 8 -> 33
+Edge 8 -> 34
+Edge 8 -> 37
+Edge 8 -> 40
+Edge 8 -> 42
+Edge 8 -> 43
+Edge 8 -> 45
+Edge 8 -> 49
+Edge 8 -> 52
+Edge 8 -> 57
+Edge 8 -> 58
+Edge 9 -> 10
+Edge 9 -> 11
+Edge 9 -> 16
+Edge 9 -> 20
+Edge 9 -> 22
+Edge 9 -> 23
+Edge 9 -> 24
+Edge 9 -> 31
+Edge 9 -> 34
+Edge 9 -> 35
+Edge 9 -> 38
+Edge 9 -> 40
+Edge 9 -> 41
+Edge 9 -> 44
+Edge 9 -> 48
+Edge 9 -> 49
+Edge 9 -> 52
+Edge 10 -> 16
+Edge 10 -> 19
+Edge 10 -> 22
+Edge 10 -> 23
+Edge 10 -> 25
+Edge 10 -> 28
+Edge 10 -> 30
+Edge 10 -> 32
+Edge 10 -> 41
+Edge 10 -> 43
+Edge 10 -> 46
+Edge 10 -> 50
+Edge 10 -> 51
+Edge 10 -> 52
+Edge 10 -> 57
+Edge 11 -> 16
+Edge 11 -> 17
+Edge 11 -> 18
+Edge 11 -> 20
+Edge 11 -> 25
+Edge 11 -> 29
+Edge 11 -> 33
+Edge 11 -> 37
+Edge 11 -> 42
+Edge 11 -> 47
+Edge 11 -> 48
+Edge 12 -> 13
+Edge 12 -> 18
+Edge 12 -> 19
+Edge 12 -> 21
+Edge 12 -> 27
+Edge 12 -> 31
+Edge 12 -> 32
+Edge 12 -> 33
+Edge 12 -> 35
+Edge 12 -> 44
+Edge 12 -> 46
+Edge 12 -> 49
+Edge 12 -> 53
+Edge 12 -> 58
+Edge 12 -> 59
+Edge 13 -> 19
+Edge 13 -> 32
+Edge 13 -> 33
+Edge 13 -> 43
+Edge 13 -> 45
+Edge 13 -> 49
+Edge 13 -> 50
+Edge 13 -> 55
+Edge 14 -> 17
+Edge 14 -> 18
+Edge 14 -> 19
+Edge 14 -> 20
+Edge 14 -> 27
+Edge 14 -> 28
+Edge 14 -> 34
+Edge 14 -> 35
+Edge 14 -> 38
+Edge 14 -> 43
+Edge 14 -> 46
+Edge 15 -> 20
+Edge 15 -> 25
+Edge 15 -> 28
+Edge 15 -> 29
+Edge 15 -> 31
+Edge 15 -> 37
+Edge 15 -> 38
+Edge 15 -> 40
+Edge 15 -> 41
+Edge 15 -> 47
+Edge 15 -> 50
+Edge 15 -> 53
+Edge 16 -> 26
+Edge 16 -> 31
+Edge 16 -> 33
+Edge 16 -> 38
+Edge 16 -> 39
+Edge 16 -> 42
+Edge 16 -> 44
+Edge 16 -> 47
+Edge 16 -> 48
+Edge 16 -> 50
+Edge 16 -> 51
+Edge 16 -> 57
+Edge 17 -> 18
+Edge 17 -> 22
+Edge 17 -> 28
+Edge 17 -> 29
+Edge 17 -> 36
+Edge 17 -> 39
+Edge 17 -> 40
+Edge 17 -> 44
+Edge 17 -> 46
+Edge 17 -> 48
+Edge 17 -> 49
+Edge 17 -> 55
+Edge 17 -> 56
+Edge 18 -> 20
+Edge 18 -> 31
+Edge 18 -> 33
+Edge 18 -> 36
+Edge 18 -> 37
+Edge 18 -> 38
+Edge 18 -> 39
+Edge 18 -> 47
+Edge 18 -> 48
+Edge 18 -> 58
+Edge 19 -> 21
+Edge 19 -> 22
+Edge 19 -> 26
+Edge 19 -> 28
+Edge 19 -> 33
+Edge 19 -> 35
+Edge 19 -> 36
+Edge 19 -> 42
+Edge 19 -> 43
+Edge 19 -> 44
+Edge 19 -> 47
+Edge 19 -> 53
+Edge 19 -> 54
+Edge 20 -> 23
+Edge 20 -> 25
+Edge 20 -> 27
+Edge 20 -> 32
+Edge 20 -> 35
+Edge 20 -> 38
+Edge 20 -> 40
+Edge 20 -> 44
+Edge 20 -> 51
+Edge 20 -> 58
+Edge 21 -> 25
+Edge 21 -> 30
+Edge 21 -> 33
+Edge 21 -> 38
+Edge 21 -> 39
+Edge 21 -> 51
+Edge 21 -> 52
+Edge 21 -> 55
+Edge 21 -> 56
+Edge 21 -> 57
+Edge 21 -> 58
+Edge 22 -> 50
+Edge 22 -> 51
+Edge 22 -> 54
+Edge 23 -> 25
+Edge 23 -> 27
+Edge 23 -> 34
+Edge 23 -> 36
+Edge 23 -> 47
+Edge 23 -> 48
+Edge 23 -> 51
+Edge 23 -> 54
+Edge 23 -> 55
+Edge 23 -> 56
+Edge 23 -> 59
+Edge 24 -> 26
+Edge 24 -> 27
+Edge 24 -> 32
+Edge 24 -> 33
+Edge 24 -> 41
+Edge 24 -> 45
+Edge 24 -> 47
+Edge 24 -> 48
+Edge 24 -> 49
+Edge 24 -> 52
+Edge 24 -> 53
+Edge 24 -> 58
+Edge 25 -> 26
+Edge 25 -> 31
+Edge 25 -> 34
+Edge 25 -> 36
+Edge 25 -> 37
+Edge 25 -> 39
+Edge 25 -> 48
+Edge 25 -> 53
+Edge 25 -> 54
+Edge 25 -> 55
+Edge 25 -> 57
+Edge 26 -> 33
+Edge 26 -> 39
+Edge 26 -> 41
+Edge 26 -> 43
+Edge 26 -> 47
+Edge 26 -> 50
+Edge 27 -> 29
+Edge 27 -> 30
+Edge 27 -> 31
+Edge 27 -> 32
+Edge 27 -> 38
+Edge 27 -> 39
+Edge 27 -> 43
+Edge 27 -> 44
+Edge 27 -> 46
+Edge 27 -> 51
+Edge 27 -> 55
+Edge 27 -> 59
+Edge 28 -> 29
+Edge 28 -> 30
+Edge 28 -> 31
+Edge 28 -> 36
+Edge 28 -> 44
+Edge 28 -> 45
+Edge 28 -> 58
+Edge 29 -> 32
+Edge 29 -> 34
+Edge 29 -> 41
+Edge 29 -> 42
+Edge 29 -> 45
+Edge 29 -> 47
+Edge 29 -> 51
+Edge 29 -> 52
+Edge 29 -> 59
+Edge 30 -> 31
+Edge 30 -> 38
+Edge 30 -> 43
+Edge 30 -> 44
+Edge 30 -> 52
+Edge 30 -> 57
+Edge 31 -> 35
+Edge 31 -> 39
+Edge 31 -> 44
+Edge 31 -> 45
+Edge 31 -> 51
+Edge 31 -> 58
+Edge 31 -> 59
+Edge 32 -> 34
+Edge 32 -> 35
+Edge 32 -> 36
+Edge 32 -> 42
+Edge 32 -> 52
+Edge 32 -> 55
+Edge 33 -> 34
+Edge 33 -> 35
+Edge 33 -> 37
+Edge 33 -> 41
+Edge 33 -> 53
+Edge 33 -> 55
+Edge 34 -> 35
+Edge 34 -> 36
+Edge 34 -> 37
+Edge 34 -> 38
+Edge 34 -> 43
+Edge 34 -> 59
+Edge 35 -> 36
+Edge 35 -> 37
+Edge 35 -> 39
+Edge 35 -> 41
+Edge 35 -> 47
+Edge 35 -> 51
+Edge 35 -> 52
+Edge 35 -> 56
+Edge 36 -> 39
+Edge 36 -> 43
+Edge 36 -> 45
+Edge 36 -> 47
+Edge 36 -> 52
+Edge 36 -> 53
+Edge 36 -> 55
+Edge 36 -> 59
+Edge 37 -> 39
+Edge 37 -> 44
+Edge 37 -> 48
+Edge 37 -> 51
+Edge 37 -> 56
+Edge 37 -> 57
+Edge 38 -> 40
+Edge 38 -> 43
+Edge 38 -> 46
+Edge 38 -> 56
+Edge 38 -> 58
+Edge 39 -> 40
+Edge 39 -> 46
+Edge 39 -> 49
+Edge 39 -> 51
+Edge 39 -> 52
+Edge 39 -> 55
+Edge 39 -> 57
+Edge 40 -> 47
+Edge 40 -> 48
+Edge 40 -> 52
+Edge 40 -> 54
+Edge 41 -> 50
+Edge 41 -> 52
+Edge 41 -> 57
+Edge 41 -> 58
+Edge 42 -> 46
+Edge 42 -> 48
+Edge 42 -> 56
+Edge 42 -> 59
+Edge 43 -> 48
+Edge 43 -> 53
+Edge 43 -> 54
+Edge 43 -> 59
+Edge 44 -> 47
+Edge 44 -> 51
+Edge 44 -> 52
+Edge 44 -> 54
+Edge 44 -> 55
+Edge 45 -> 48
+Edge 45 -> 49
+Edge 45 -> 51
+Edge 45 -> 52
+Edge 45 -> 54
+Edge 45 -> 57
+Edge 45 -> 58
+Edge 46 -> 47
+Edge 46 -> 50
+Edge 46 -> 54
+Edge 46 -> 55
+Edge 47 -> 48
+Edge 47 -> 52
+Edge 47 -> 59
+Edge 48 -> 52
+Edge 48 -> 53
+Edge 48 -> 56
+Edge 48 -> 58
+Edge 49 -> 53
+Edge 49 -> 54
+Edge 49 -> 59
+Edge 50 -> 52
+Edge 50 -> 53
+Edge 50 -> 57
+Edge 50 -> 59
+Edge 51 -> 54
+Edge 51 -> 58
+Edge 52 -> 54
+Edge 52 -> 55
+Edge 52 -> 59
+Edge 54 -> 57
+Edge 54 -> 58
+Edge 56 -> 57
+Edge 56 -> 58
+Edge 57 -> 58
diff --git a/include/random_graph.h b/include/random_graph.h
index 706ca50..6d1abe8 100644
--- a/include/random_graph.h
+++ b/include/random_graph.h
@@ -12,6 +12,7 @@ typedef struct Edge {
 } Edge;
 
 // Function prototypes
+int cmpInt(const void *a, const void *b);
 unsigned int uv2index(unsigned int u, unsigned int v, unsigned int n);
 unsigned int min(unsigned int u, unsigned int v);
 unsigned int max(unsigned int u, unsigned int v);
diff --git a/include/random_groups.h b/include/random_groups.h
new file mode 100644
index 0000000..8c291f9
--- /dev/null
+++ b/include/random_groups.h
@@ -0,0 +1,16 @@
+#ifndef RANDOM_GROUPS_H
+#define RANDOM_GROUPS_H
+
+#include <stdlib.h>
+#include <stdio.h>
+
+// Struct for representing groups
+typedef struct {
+    unsigned int *group; // Pointer to an array of group members
+    unsigned int size;   // Number of members in the group
+} Group;
+
+// Function to generate random groups
+void generate_random_groups(unsigned int n, unsigned int k, Group **groups);
+
+#endif // RANDOM_GROUPS_H
diff --git a/src/main.c b/src/main.c
index c25a1f7..ec43c65 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,9 +1,10 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include "random_graph.h"
+#include "random_groups.h"
 
 int main() {
-    unsigned int n = 5000, m = 10000, seed = 0;
+    unsigned int n = 20, m = 80, k = 4, seed = 5;
     Edge *edges = malloc(m * sizeof(Edge));
     if (!edges) {
         fprintf(stderr, "Error: Memory allocation of EDGE array: edges FAILED.\n");
@@ -17,6 +18,21 @@ int main() {
         printf("Edge %d -> %d\n", edges[i].src, edges[i].dest);
     }
 
+
+    Group *groups;
+    generate_random_groups(n, k, &groups);
+
+    // Print groups
+    printf("Random groups:\n");
+    for (unsigned int i = 0; i < k; i++) {
+        printf("Group %u: ", i);
+        for (unsigned int j = 0; j < groups[i].size; j++) {
+            printf("%u ", groups[i].group[j]);
+        }
+        printf("\n");
+        free(groups[i].group); // Free each group's array
+    }
+    free(groups); // Free the groups array
     free(edges);
     return 0;
 }
diff --git a/src/random_groups.c b/src/random_groups.c
new file mode 100644
index 0000000..53c0af3
--- /dev/null
+++ b/src/random_groups.c
@@ -0,0 +1,87 @@
+#include "random_groups.h"
+#include "random_graph.h"
+
+// Helper function to shuffle an array
+void shuffle(unsigned int *array, unsigned int size) {
+    for (unsigned int i = size - 1; i > 0; i--) {
+        unsigned int j = rand() % (i + 1);
+        unsigned int temp = array[i];
+        array[i] = array[j];
+        array[j] = temp;
+    }
+}
+
+
+void generate_random_groups(unsigned int n, unsigned int k, Group **groups_out) {
+    if (k > n) {
+        fprintf(stderr, "Error: Number of groups (k) cannot exceed the number of vertices (n).\n");
+        exit(EXIT_FAILURE);
+    }
+
+    // Allocate memory for array N (vertices) and initialize
+    unsigned int *N = (unsigned int *)malloc(n * sizeof(unsigned int));
+    if (!N) {
+        fprintf(stderr, "Error: Memory allocation failed for array N.\n");
+        exit(EXIT_FAILURE);
+    }
+    for (unsigned int i = 0; i < n; i++) {
+        N[i] = i;
+    }
+
+    // Allocate memory for groups
+    Group *groups = (Group *)malloc(k * sizeof(Group));
+    if (!groups) {
+        fprintf(stderr, "Error: Memory allocation failed for groups.\n");
+        free(N);
+        exit(EXIT_FAILURE);
+    }
+    for (unsigned int i = 0; i < k; i++) {
+        groups[i].group = (unsigned int *)malloc(n * sizeof(unsigned int));
+        groups[i].size = 0;
+        if (!groups[i].group) {
+            fprintf(stderr, "Error: Memory allocation failed for group %u.\n", i);
+            for (unsigned int j = 0; j < i; j++) {
+                free(groups[j].group);
+            }
+            free(groups);
+            free(N);
+            exit(EXIT_FAILURE);
+        }
+    }
+
+    // Generate a random float f in the range (0, 0.5)
+    float f;
+    do {
+        f = (float)rand() / RAND_MAX;
+    } while (f <= 0.0 || f >= 0.5);
+
+    unsigned int offset = (unsigned int)(f * n);
+
+    // Shuffle the array N
+    shuffle(N, n);
+
+    // Distribute elements to the first part of each group
+    for (unsigned int i = 0; i < k; i++) {
+        groups[i].group[groups[i].size++] = N[offset + i];
+    }
+
+    // Distribute remaining elements to groups
+    for (unsigned int i = 0; i < k; i++) {
+        unsigned int start = offset + k;
+        unsigned int end = offset + k + (n - offset) / k - 1;
+        shuffle(N + start, end - start + 1);
+
+        for (unsigned int j = start; j <= end; j++) {
+            groups[i].group[groups[i].size++] = N[j];
+        }
+    }
+
+    // Sort each group
+    for (unsigned int i = 0; i < k; i++) {
+        qsort(groups[i].group, groups[i].size, sizeof(unsigned int), cmpInt);
+    }
+
+    // Clean up
+    free(N);
+    *groups_out = groups;
+}