diff --git a/Complementary DNA/ComplimentaryDNA.cpp b/Complementary DNA/ComplimentaryDNA.cpp
index 2656a8c..f285677 100644
--- a/Complementary DNA/ComplimentaryDNA.cpp	
+++ b/Complementary DNA/ComplimentaryDNA.cpp	
@@ -5,8 +5,29 @@ using namespace std;
 
 std::string DNAStrand(const std::string& dna){
   std::vector<std::string> DNA;
-  for (auto d : dna)
-    DNA.push_back(d);
-  
-  
+  for (int i = 0; i < dna.length(); i++)
+    DNA.push_back(dna);
+  uint_fast32_t i=0;
+  for (auto elements : DNA){
+    if(elements == "A"){
+        DNA.assign( i, "T");
+        i++;
+        break;
+    }
+    else if(elements == "T"){
+        DNA.assign( i, "A");
+        i++;
+        break;
+    } 
+    else if(elements == "C"){
+        DNA.assign( i, "G");
+        i++;
+        break;
+    } 
+    else if(elements == "G"){
+        DNA.assign( i, "C");
+        i++;
+    } 
+  }
+  std::string str(DNA.begin(), DNA.end());
 }
\ No newline at end of file
diff --git a/Highest and lowest/main.cpp b/Highest and lowest/main.cpp
index e415d1d..a1903ab 100644
--- a/Highest and lowest/main.cpp	
+++ b/Highest and lowest/main.cpp	
@@ -11,5 +11,5 @@ std::string highAndLow(const std::string& numbers){
     nums.push_back(num);
   }
   auto min_max = std::minmax_element(nums.begin(), nums.end());
-  return std::is_string(*min_max.second()) + " " +  std::string(*min_max.first();)
+  return is_string(*min_max.second) + " " +  is_string(*min_max.first);
 }