Compilare: main.cpp: In function 'int dfs(int, int)': main.cpp:26:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<Ad[nod].size();++i) ~^~~~~~~~~~~~~~~ main.cpp:41:25: warning: statement has no effect [-Wunused-value] viz[nod]==1; ~~~~~~~~^~~ main.cpp:46:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ main.cpp: In function 'int solve(int)': main.cpp:57:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<Ad[nod].size();++j) ~^~~~~~~~~~~~~~~