Compilare: user.cpp:4:11: warning: literal operator suffixes not preceded by ‘_’ are reserved for future standardization #define s second ^ user.cpp:4:11: warning: literal operator suffixes not preceded by ‘_’ are reserved for future standardization #define s second ^ user.cpp:4:11: warning: literal operator suffixes not preceded by ‘_’ are reserved for future standardization #define s second ^ user.cpp:4:11: warning: literal operator suffixes not preceded by ‘_’ are reserved for future standardization #define s second ^ user.cpp: In function ‘double dijkstra()’: user.cpp:58:1: warning: control reaches end of non-void function [-Wreturn-type] } ^