Refactor fitness calculation using combinations

src/main.py

@@ -3,6 +3,7 @@ from greedy import greedy_algorithm
 from local_search import local_search
 from sys import argv
 from time import time
+from itertools import combinations
 
 
 def execute_algorithm(choice, n, m, data):
@@ -25,11 +26,12 @@ def get_row_distance(source, destination, data):
 
 def get_fitness(solutions, data):
     counter = 0
-    for i in range(len(solutions) - 1):
-        for j in range(i + 1, len(solutions)):
+    comb = combinations(solutions.index, r=2)
+    for index in list(comb):
+        elements = solutions.loc[index, :]
         counter += get_row_distance(
-                source=solutions["point"].iloc[i],
-                destination=solutions["point"].iloc[j],
+            source=elements["point"].head(n=1).values[0],
+            destination=elements["point"].tail(n=1).values[0],
             data=data,
         )
     return counter