Change compile flags to c++17 (#16)

Author: prabowo02

Diff for: problem-assets/Makefile

@@ -23,7 +23,7 @@
 
 # Defining some recursively expanded variables
 
-CXXFLAGS=-std=gnu++1y -Wall -Wextra -O2
+CXXFLAGS=-std=c++17 -Wall -Wextra -O2
 
 CPP_EXT=cpp
 HEADER_EXT=h

Diff for: scripts/internal/compile_solution.sh

@@ -189,7 +189,7 @@ fi
 
 
 if [ "${LANG}" == "cpp" ] ; then
-	variable_exists "CPP_STD_OPT" || CPP_STD_OPT="--std=gnu++14"
+	variable_exists "CPP_STD_OPT" || CPP_STD_OPT="--std=c++17"
 	vecho "CPP_STD_OPT='${CPP_STD_OPT}'"
 	variable_exists "CPP_WARNING_OPTS" || CPP_WARNING_OPTS="-Wall -Wextra -Wshadow"
 	vecho "CPP_WARNING_OPTS='${CPP_WARNING_OPTS}'"