Add type hints in problems 11-20

Python/p011.py

@@ -31,7 +31,7 @@ from projecteuler import timing
 
 
 @timing
-def p011():
+def p011() -> None:
     grid = [[8, 2, 22, 97, 38, 15, 0, 40, 0, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8],
             [49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 0],
             [81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65],
@@ -67,8 +67,7 @@ def p011():
                 prod = prod * grid[i][k]
                 k = k + 1
 
-            if prod > max_:
-                max_ = prod
+            max_ = max(max_, prod)
 
             # Vertical direction.
             prod = 1
@@ -77,8 +76,7 @@ def p011():
                 prod = prod * grid[k][j]
                 k = k + 1
 
-            if prod > max_:
-                max_ = prod
+            max_ = max(max_, prod)
 
             # Diagonal direction, from top left to bottom right.
             prod = 1
@@ -90,8 +88,7 @@ def p011():
                 k = k + 1
                 w = w + 1
 
-            if prod > max_:
-                max_ = prod
+            max_ = max(max_, prod)
 
     # The last diagonal is handled separately
     for i in range(17):
@@ -106,8 +103,7 @@ def p011():
                 k = k + 1
                 w = w - 1
 
-            if prod > max_:
-                max_ = prod
+            max_ = max(max_, prod)
 
     print('Project Euler, Problem 11')
     print(f'Answer: {max_}')

Python/p012.py

@@ -23,7 +23,7 @@ from projecteuler import count_divisors, timing
 
 
 @timing
-def p012():
+def p012() -> None:
     i = 0
     triang = 0
     finished = 0

Python/p013.py

@@ -109,7 +109,7 @@ from projecteuler import timing
 
 
 @timing
-def p013():
+def p013() -> None:
     numbers = [37107287533902102798797998220837590246510135740250,
                46376937677490009712648124896970078050417018260538,
                74324986199524741059474233309513058123726617309629,

Python/p014.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python3 
+#!/usr/bin/env python3
 
 # The following iterative sequence is defined for the set of positive integers:
 #
@@ -28,7 +28,7 @@ collatz_found = zeros(N, dtype=int)
 # Recursive function to calculate the Collatz sequence for n.
 # If n is even, Collatz(n)=1+Collatz(n/2), if n is odd
 # Collatz(n)=1+Collatz(3*n+1).
-def collatz_length(n):
+def collatz_length(n: int) -> int:
 
     if n == 1:
         return 1
@@ -45,7 +45,7 @@ def collatz_length(n):
 
 
 @timing
-def p014():
+def p014() -> None:
     max_l = 0
     max_ = 0
 

Python/p015.py

@@ -9,7 +9,7 @@ from projecteuler import timing
 
 
 @timing
-def p015():
+def p015() -> None:
     # Using a combinatorial solution: in a 20x20 grid there will always be
     # 20 movements to the right and 20 movements down, that can be represented
     # as a string of Rs and Ds. The number of routes is the number of combinations.

Python/p016.py

@@ -8,7 +8,7 @@ from projecteuler import timing
 
 
 @timing
-def p016():
+def p016() -> None:
     # Simply calculate 2^1000, convert the result to string and calculate
     # the sum of the digits
     res = str(2 ** 1000)

Python/p017.py

@@ -11,7 +11,7 @@ from projecteuler import timing
 
 
 @timing
-def p017():
+def p017() -> None:
     # First list contains number of letters for numbers from 1 to 19,
     # the second letters for "twenty", "thirty", ..., "ninety",
     # the third letters for "one hundred and", "two hundred and", ..., "nine hundre and",

Python/p018.py

@@ -36,7 +36,7 @@ from projecteuler import find_max_path, timing
 
 
 @timing
-def p018():
+def p018() -> None:
     try:
         with open('p018_triangle.txt', 'r', encoding='utf-8') as fp:
             triang = []

Python/p019.py

@@ -19,7 +19,7 @@ from projecteuler import timing
 
 
 @timing
-def p019():
+def p019() -> None:
     count = 0
 
     # Use the datetime library to find out which first day of the month is a Sunday

Python/p020.py

@@ -13,7 +13,7 @@ from projecteuler import timing
 
 
 @timing
-def p020():
+def p020() -> None:
     # Calculate the factorial, convert the result to string and sum the digits.
     n = str(factorial(100))