diff --git a/solutions/01A.cpp b/solutions/01A.cpp
index 2fa7724..57d29c5 100644
--- a/solutions/01A.cpp
+++ b/solutions/01A.cpp
@@ -3,28 +3,31 @@
 #include <string>
 #include <vector>
 
+const std::vector<int>& readToInt(const std::string& path);
 
 int main()
 {
-std::ifstream inputFile("../input/01.txt");
-std::string input;
-std::vector<int> values;
+  std::vector<int> depths = readToInt("../input/01.txt");   
+
+  int increases = 0;
+  for(auto i = 0; i < depths.size() - 1; i++)
+    increases += 1 * (depths[i] < depths[i+1]);
+
+  std::cout << increases << std::endl;
+
+  return 0;
+}
+
+const std::vector<int>& readToInt(const std::string& path)
+{
+  std::ifstream inputFile(path);
+  static std::vector<int> inputs;
    
-while(std::getline(inputFile, input))
-{
-  values.push_back(std::stoi(input));
-}
-
-inputFile.close();
-
-
-int increases = 0;
-for(auto i = 0; i < values.size() - 1; i++)
-{
-  increases += 1 * (values[i] < values[i+1]);
-}
-
-std::cout << increases << std::endl;
-
-return 0;
+  std::string input;
+  while(std::getline(inputFile, input))
+    inputs.push_back(std::stoi(input));
+
+  inputFile.close();  
+
+  return inputs;
 }
diff --git a/solutions/01B.cpp b/solutions/01B.cpp
index e465d4e..328ee8c 100644
--- a/solutions/01B.cpp
+++ b/solutions/01B.cpp
@@ -2,29 +2,32 @@
 #include <fstream>
 #include <string>
 #include <vector>
-#include <numeric>
+
+const std::vector<int>& readToInt(const std::string& path);
 
 int main()
 {
-  std::ifstream inputFile("../input/01.txt");
-  std::string input;
-  std::vector<int> values;
+  std::vector<int> depths = readToInt("../input/01.txt");
       
-  while(std::getline(inputFile, input))
-  {
-    values.push_back(std::stoi(input));
-  }
-
-  inputFile.close();
-
   int increases = 0;
-  for(auto i = 0; i < values.size() - 3; i++)
-  {
-    increases += 1 * (values[i]+values[i+1]+values[i+2] < values[i+1]+values[i+2]+values[i+3]);
-  }
+  for(auto i = 0; i < depths.size() - 3; i++)
+    increases += 1 * (depths[i]+depths[i+1]+depths[i+2] < depths[i+1]+depths[i+2]+depths[i+3]);
 
   std::cout << increases << std::endl;
 
   return 0;
 }
 
+const std::vector<int>& readToInt(const std::string& path)
+{
+  std::ifstream inputFile(path);
+  static std::vector<int> inputs;
+   
+  std::string input;
+  while(std::getline(inputFile, input))
+    inputs.push_back(std::stoi(input));
+
+  inputFile.close();  
+
+  return inputs;
+}
diff --git a/solutions/02A.cpp b/solutions/02A.cpp
index 80cf3cd..6b459b4 100644
--- a/solutions/02A.cpp
+++ b/solutions/02A.cpp
@@ -1,19 +1,21 @@
 #include <iostream>
 #include <fstream>
 #include <string>
+#include <vector>
+
+const std::vector<std::string>& readToString(const std::string& path);
 
 int main() 
 {
-  std::ifstream inputFile("../input/02.txt");
-  std::string input;
+  std::vector<std::string> commands = readToString("../input/02.txt");
   long h,d = 0;
 
-  while(std::getline(inputFile, input))
+  for(auto& command : commands)
   {
-    input.pop_back();
-    int val = input.back() - 48;
+    command.pop_back();
+    int val = command.back() - 48;
 
-    switch(input.front())
+    switch(command.front())
     {
       case 'f': h += val; break;
       case 'u': d -= val; break;
@@ -21,9 +23,19 @@ int main()
     }
   }
 
-  inputFile.close();
-
   std::cout << d*h << std::endl;
 
   return 0;
+}
+
+const std::vector<std::string>& readToString(const std::string& path)
+{
+  std::ifstream inputFile(path);
+  std::string input;
+  static std::vector<std::string> inputs;
+   
+  while(std::getline(inputFile, input))
+    inputs.push_back(input);
+
+  return inputs;
 }
\ No newline at end of file
diff --git a/solutions/02B.cpp b/solutions/02B.cpp
index 8ab341f..7e1d53f 100644
--- a/solutions/02B.cpp
+++ b/solutions/02B.cpp
@@ -1,19 +1,21 @@
 #include <iostream>
 #include <fstream>
 #include <string>
+#include <vector>
+
+const std::vector<std::string>& readToString(const std::string& path);
 
 int main() 
 {
-  std::ifstream inputFile("../input/02.txt");
-  std::string input;
+  std::vector<std::string> commands = readToString("../input/02.txt");
   long h,d,a = 0;
 
-  while(std::getline(inputFile, input))
+  for(auto& command : commands)
   {
-    input.pop_back();
-    int val = input.back() - 48;
+    command.pop_back();
+    int val = command.back() - 48;
 
-    switch(input.front())
+    switch(command.front())
     {
       case 'f': d += a * val;
                 h += val; break;
@@ -22,9 +24,19 @@ int main()
     }
   }
 
-  inputFile.close();
-
   std::cout << d*h << std::endl;
 
   return 0;
+}
+
+const std::vector<std::string>& readToString(const std::string& path)
+{
+  std::ifstream inputFile(path);
+  std::string input;
+  static std::vector<std::string> inputs;
+   
+  while(std::getline(inputFile, input))
+    inputs.push_back(input);
+
+  return inputs;
 }
\ No newline at end of file
diff --git a/solutions/03A.cpp b/solutions/03A.cpp
index 4ca5e29..7484b2c 100644
--- a/solutions/03A.cpp
+++ b/solutions/03A.cpp
@@ -13,18 +13,16 @@ const void getGammaEpsilon(std::bitset<bSize>& g,
 
 int main() 
 {
-
-  std::vector<std::string> inputs = readToString("../input/03.txt");
+  std::vector<std::string> rates = readToString("../input/03.txt");
   std::bitset<bSize> g, e;
 
-  getGammaEpsilon(g, e, inputs);
+  getGammaEpsilon(g, e, rates);
 
   std::cout << (g.to_ulong() * e.to_ulong()) << std::endl;
 
   return 0;
 }
 
-
 const std::vector<std::string>& readToString(const std::string& path)
 {
   std::ifstream inputFile(path);
@@ -46,10 +44,10 @@ const void getGammaEpsilon(std::bitset<bSize>& g,
   int bitOccurence [bSize]{};
 
   for(const auto& el : v)
-    for(int b = 0; b < bSize; b++)
+    for(auto b = 0; b < bSize; b++)
       bitOccurence[b] += el[b] - 48;
 
-  for(int b = 0; b < bSize; b++)
+  for(auto b = 0; b < bSize; b++)
     g.set(bSize-b-1, bitOccurence[b] > v.size()/2);
 
   e = ~g;  
diff --git a/solutions/03B.cpp b/solutions/03B.cpp
index 8eae4d7..f68dce9 100644
--- a/solutions/03B.cpp
+++ b/solutions/03B.cpp
@@ -16,10 +16,10 @@ std::string filterCommonBinary(bool common, std::vector<std::string> v);
 
 int main() 
 {
-  std::vector<std::string> inputs = readToString("../input/03.txt");
+  std::vector<std::string> rates = readToString("../input/03.txt");
   
-  std::bitset<bSize> o{filterCommonBinary(true, inputs)};
-  std::bitset<bSize> c{filterCommonBinary(false, inputs)};
+  std::bitset<bSize> o{filterCommonBinary(true, rates)};
+  std::bitset<bSize> c{filterCommonBinary(false, rates)};
   
   std::cout << o.to_ulong() * c.to_ulong() << std::endl;
   
@@ -47,13 +47,12 @@ const void getGammaEpsilon(std::bitset<bSize>& g,
   int bitOccurence [bSize]{};
 
   for(const auto& el : v)
-    for(int b = 0; b < bSize; b++)
+    for(auto b = 0; b < bSize; b++)
       bitOccurence[b] += el[b] - 48;
 
-  for(int b = 0; b < bSize; b++)
+  for(auto b = 0; b < bSize; b++)
     g.set(bSize-b-1, bitOccurence[b] >= round((float) v.size()/2));
   
-
   e = ~g;  
 }
 
@@ -61,12 +60,9 @@ const void filterCommonBit(int bit, const std::bitset<bSize>& f, std::vector<std
 {
   std::vector<std::string> nv;
   
-
-  for(int i = 0; i < v.size(); i++) {
+  for(auto i = 0; i < v.size(); i++) 
     if(f[bSize-bit-1] == v[i][bit] - 48)
       nv.push_back(v[i]);
-  }
-
 
   v.clear();
   for(const auto& e : nv)
@@ -77,7 +73,7 @@ std::string filterCommonBinary(bool common, std::vector<std::string> v)
 {
   std::bitset<bSize> g, e;
 
-  for(int b = 0; b < bSize; b++)
+  for(auto b = 0; b < bSize; b++)
   {
     getGammaEpsilon(g, e, v);
     filterCommonBit(b, common ? g : e, v);