Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:16:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void dfs1(int)’: user.cpp:35:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:62:19: warning: statement has no effect [-Wunused-value] sol[i]==0; ^ user.cpp:47:15: warning: unused variable ‘j’ [-Wunused-variable] int x, y, i, j, ok; ^ user.cpp:47:18: warning: unused variable ‘ok’ [-Wunused-variable] int x, y, i, j, ok; ^