diff --git a/src/llm_benchmark/control/single.py b/src/llm_benchmark/control/single.py
index 9a314e6..b99fd8d 100644
--- a/src/llm_benchmark/control/single.py
+++ b/src/llm_benchmark/control/single.py
@@ -12,10 +12,7 @@ def sum_range(n: int) -> int:
         Returns:
             int: Sum of range of numbers from 0 to n
         """
-        arr = []
-        for i in range(n):
-            arr.append(i)
-        return sum(arr)
+        return (n * (n - 1)) // 2
 
     @staticmethod
     def max_list(v: List[int]) -> int:
@@ -27,11 +24,7 @@ def max_list(v: List[int]) -> int:
         Returns:
             int: Maximum value in the vector
         """
-        max_val = v[0]
-        for i in range(1, len(v)):
-            if v[i] > max_val:
-                max_val = v[i]
-        return max_val
+        return max(v) if v else 0
 
     @staticmethod
     def sum_modulus(n: int, m: int) -> int:
@@ -44,8 +37,7 @@ def sum_modulus(n: int, m: int) -> int:
         Returns:
             int: Sum of modulus of numbers from 0 to n
         """
-        arr = []
-        for i in range(n):
-            if i % m == 0:
-                arr.append(i)
-        return sum(arr)
+        sum_val = 0
+        for i in range(0, n, m):
+            sum_val += i
+        return sum_val
\ No newline at end of file