Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:22:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) { ^ user.cpp: In function ‘void minim(int, int)’: user.cpp:38:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) { ^ user.cpp: In function ‘int solve(int)’: user.cpp:47:11: warning: unused variable ‘t’ [-Wunused-variable] int j,t; ^ user.cpp:71:1: warning: control reaches end of non-void function [-Wreturn-type] } ^