Compilare: main.cpp: In function 'void dfs(int)': main.cpp:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<=a[nod].size();i++) { ~^~~~~~~~~~~~~~~ main.cpp: In function 'int nivelUrm(int)': main.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=a[nod].size();i++) { ~^~~~~~~~~~~~~~~ main.cpp:23:9: warning: unused variable 'n' [-Wunused-variable] int n=nivel[nod]; ^ main.cpp: In function 'int costUrm(int)': main.cpp:34:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1;i<=a[nod].size();i++) { ~^~~~~~~~~~~~~~~ main.cpp:33:9: warning: unused variable 'n' [-Wunused-variable] int n=nivel[nod]; ^ main.cpp: In function 'int nivelUrm(int)': main.cpp:30:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int costUrm(int)': main.cpp:41:1: warning: control reaches end of non-void function [-Wreturn-type] } ^