Updated response

Sheet5/Ex2_Second_Attempt/Makefile

@@ -0,0 +1,30 @@
+#
+# use GNU-Compiler tools
+COMPILER=GCC_
+# alternatively from the shell
+# export COMPILER=GCC_
+# or, alternatively from the shell
+# make COMPILER=GCC_
+
+# use Intel compilers
+#COMPILER=ICC_
+
+# use PGI compilers
+# COMPILER=PGI_
+EX=Ex2
+
+SOURCES = main${EX}.cpp
+OBJECTS = $(SOURCES:.cpp=.o)
+
+PROGRAM	= main.${COMPILER}
+
+# uncomment the next to lines for debugging and detailed performance analysis
+CXXFLAGS += -g -fopenmp
+LINKFLAGS += -g -fopenmp -ltbb
+# do not use -pg with PGI compilers
+
+ifndef COMPILER
+  COMPILER=GCC_
+endif
+
+include ${COMPILER}default.mk

Sheet5/Ex2_Second_Attempt/mainEx2.cpp

@@ -3,7 +3,7 @@
 #include <vector>
 #include <cmath>
 #include <algorithm>
-// #include <execution>   // only include if the compiler supports it
+ #include <execution>   // only include if the compiler supports it
 #include <omp.h>
 
 using namespace std;
@@ -94,7 +94,7 @@ int main() {
         "but my Mac's Clang compiler does not support parallel execution policies.\n";
 
     // C++17 execution policy version
-    /*
+   
     double t_ep_start = omp_get_wtime();
 
     auto p = minmax_element(execution::par, v.begin(), v.end());
@@ -140,6 +140,6 @@ int main() {
          << ", Harmonic mean: " << harm_ep << "\n";
     cout << "Standard deviation: " << std_ep << "\n";
     cout << "Elapsed time (s): " << t_ep_end - t_ep_start << "\n";
-    */
+   
     return 0;
 }