Compilare: main.cpp: In function 'int dfs_niv(int, int)': main.cpp:17:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp:19:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int dfs(int, int)': main.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<m[nod].size();i++) ~^~~~~~~~~~~~~~ main.cpp:37:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int main()': main.cpp:72:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^