Compilare: main.cpp: In function 'bool operator<(drum, drum)': main.cpp:23:15: warning: statement has no effect [-Wunused-value] d1.energie<d2.energie; ~~~~~~~~~~^~~~~~~~~~~ main.cpp:24:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int dijkstra(int)': main.cpp:60:13: warning: unused variable 'timp' [-Wunused-variable] int timp=q.begin()->durata; ^~~~ main.cpp:61:13: warning: unused variable 'watt' [-Wunused-variable] int watt=q.begin()->energie; ^~~~