Fixed typing errors(Visual Studio type checker sucks)

Demo/main.cpp

@@ -1,6 +1,9 @@
 #include <iostream>
 #include <locale>
+
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32) && !defined(__CYGWIN__)
 #include <Windows.h>
+#endif
 
 #include "../QRCodeLibrary/QRCode.hpp"
 

QRCodeLibrary/Encoder.hpp

@@ -56,9 +56,9 @@ private:
 	BitArray e;
 };
 
-template <typename T, unsigned N>
+template <typename T, size_t N>
 constexpr unsigned upper_index(const array<T, N> arr, T val) {
-	unsigned count = arr.size(), s = 0, e, step;
+	unsigned count = arr.size(), s = 0, e = 0, step = 0;
 
 	while (count > 0) {
 		step = count / 2;

QRCodeLibrary/Method.cpp

@@ -1,5 +1,7 @@
 #include "pch.h"
 
+#include <algorithm>
+
 #include "Method.hpp"
 #include "Tables.hpp"