Fix mypy error at maths (#4613)

* Fix mypy errors for maths/greedy_coin_change.py

* Fix mypy errors for maths/two_sum.py

* Fix mypy errors for maths/triplet_sum.py

* Fix the format of maths/greedy_coin_change.py

* Fix the format of maths/greedy_coin_change.py

* Fix format with pre-commit

Author: imp2002

Diff for: maths/greedy_coin_change.py

@@ -41,7 +41,7 @@
 """
 
 
-def find_minimum_change(denominations: list[int], value: int) -> list[int]:
+def find_minimum_change(denominations: list[int], value: str) -> list[int]:
     """
     Find the minimum change from the given denominations and value
     >>> find_minimum_change([1, 5, 10, 20, 50, 100, 200, 500, 1000,2000], 18745)
@@ -75,7 +75,7 @@ def find_minimum_change(denominations: list[int], value: int) -> list[int]:
 if __name__ == "__main__":
 
     denominations = list()
-    value = 0
+    value = "0"
 
     if (
         input("Do you want to enter your denominations ? (yY/n): ").strip().lower()

Diff for: maths/triplet_sum.py

@@ -19,7 +19,7 @@ def make_dataset() -> tuple[list[int], int]:
 dataset = make_dataset()
 
 
-def triplet_sum1(arr: list[int], target: int) -> tuple[int, int, int]:
+def triplet_sum1(arr: list[int], target: int) -> tuple[int, ...]:
     """
     Returns a triplet in the array with sum equal to target,
     else (0, 0, 0).

Diff for: maths/two_sum.py

@@ -31,7 +31,7 @@ def two_sum(nums: list[int], target: int) -> list[int]:
     >>> two_sum([3 * i for i in range(10)], 19)
     []
     """
-    chk_map = {}
+    chk_map: dict[int, int] = {}
     for index, val in enumerate(nums):
         compl = target - val
         if compl in chk_map: