diff --git a/Fitness.c b/Fitness.c
index 8b13789..cf536c1 100644
--- a/Fitness.c
+++ b/Fitness.c
@@ -1 +1,106 @@
 
+// Fitness function for GWO
+double fitness(Node* wolf, int target) {
+    return abs(wolf->data - target);
+}
+
+// GWO search function
+void gwoSearch(Node* head, int target) {
+    int n_wolves = 5; // number of grey wolves
+    int max_iterations = 100;
+    double a = 2, b = 2; // GWO parameters
+
+    // Initialize wolves with random positions in the linked list
+    Node* wolves[n_wolves];
+    for (int i = 0; i < n_wolves; i++) {
+        wolves[i] = head;
+        for (int j = 0; j < rand() % 10; j++) {
+            if (wolves[i]->east != NULL) {
+                wolves[i] = wolves[i]->east;
+            }
+        }
+    }
+
+    for (int iter = 0; iter < max_iterations; iter++) {
+        // Encircle: calculate fitness of each wolf
+        double fitness_values[n_wolves];
+        for (int i = 0; i < n_wolves; i++) {
+            fitness_values[i] = fitness(wolves[i], target);
+        }
+
+        // Hunt: identify the three best wolves
+        Node* alpha, *beta, *delta;
+        alpha = beta = delta = NULL;
+        for (int i = 0; i < n_wolves; i++) {
+            if (fitness_values[i] < fitness_values[wolves[i] == alpha ? i : 0]) {
+                delta = beta;
+                beta = alpha;
+                alpha = wolves[i];
+            } else if (fitness_values[i] < fitness_values[wolves[i] == beta ? i : 0]) {
+                delta = beta;
+                beta = wolves[i];
+            } else if (fitness_values[i] < fitness_values[wolves[i] == delta ? i : 0]) {
+                delta = wolves[i];
+            }
+        }
+
+        // Update positions of all wolves
+        for (int i = 0; i < n_wolves; i++) {
+            if (wolves[i] == alpha) {
+                wolves[i] = alpha;
+            } else if (wolves[i] == beta) {
+                wolves[i] = beta;
+            } else if (wolves[i] == delta) {
+                wolves[i] = delta;
+            } else {
+                wolves[i] = wolves[i]->east;
+            }
+
+            // Move wolf in a random direction
+            int direction = rand() % 4;
+            switch (direction) {
+                case 0:
+                    if (wolves[i]->east != NULL) {
+                        wolves[i] = wolves[i]->east;
+                    }
+                    break;
+                case 1:
+                    if (wolves[i]->west != NULL) {
+                        wolves[i] = wolves[i]->west;
+                    }
+                    break;
+                case 2:
+                    if (wolves[i]->north != NULL) {
+                        wolves[i] = wolves[i]->north;
+                    }
+                    break;
+                case 3:
+                    if (wolves[i]->east != NULL && rand() % 2 == 0) {
+                        wolves[i] = wolves[i]->east;
+                    } else if (wolves[i]->west != NULL) {
+                        wolves[i] = wolves[i]->west;
+                    } else if (wolves[i]->north != NULL ) {
+                        wolves[i] = wolves[i]->north;
+                    }
+                    break;
+            }
+        }
+
+        // Check if any wolf has found the target
+        for (int i = 0; i < n_wolves; i++) {
+            if (wolves[i]->data == target) {
+                Node* current = head;
+                int item_no = 1;
+                while (current != wolves[i]) {
+                    current = current->east;
+                    item_no++;
+                }
+                printf("Target %d found at iteration %d, item no %d!\n", target, iter, item_no);
+                return;
+            }
+        }
+    }
+
+    printf("Target %d not found after %d iterations.\n", target, max_iterations);
+}
+