Add type hints in problems 51-53

Python/p051.py

@@ -17,7 +17,7 @@ N = 1000000
 primes = sieve(N)
 
 
-def count_digit(n, d):
+def count_digit(n: int, d: int) -> int:
     count = 0
 
     while n > 0:
@@ -28,10 +28,10 @@ def count_digit(n, d):
     return count
 
 
-def replace(n):
+def replace(n: int) -> int:
     n_string = list(str(n))
     l = len(n_string)
-    max_ = 0
+    _max = 0
 
     for i in range(l-3):
         for j in range(i+1, l-2):
@@ -54,16 +54,16 @@ def replace(n):
                     if primes[n_replaced] == 1:
                         if count == 0 and n_replaced != n:
                             continue
+
                         count = count + 1
 
-                if count > max_:
-                    max_ = count
+                _max = max(_max, count)
 
-    return max_
+    return _max
 
 
 @timing
-def p051():
+def p051() -> None:
     # Checking only odd numbers with at least 4 digits.
     i = 1001
 
@@ -78,6 +78,7 @@ def p051():
                 count_digit(i, 2) >= 3:
             if primes[i] == 1 and replace(i) == 8:
                 break
+
         i = i + 2
 
     print('Project Euler, Problem 51')

Python/p052.py

@@ -8,7 +8,7 @@ from projecteuler import timing
 
 
 @timing
-def p052():
+def p052() -> None:
     i = 1
 
     # Brute force approach, try every integer number until the desired one is found.
@@ -19,6 +19,7 @@ def p052():
                 ''.join(sorted(str(i))) == ''.join(sorted(str(5*i))) and\
                 ''.join(sorted(str(i))) == ''.join(sorted(str(6*i))):
             break
+
         i = i + 1
 
     print('Project Euler, Problem 52')

Python/p053.py

@@ -18,7 +18,7 @@ from projecteuler import timing
 
 
 @timing
-def p053():
+def p053() -> None:
     LIMIT = 1000000
 
     count = 0