Compilare: user.cpp: In function ‘void dfsroot(int)’: user.cpp:14:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) { ^ user.cpp: In function ‘void dfsdp(int)’: user.cpp:26:26: 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:40:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,a,b; ^ user.cpp: In function ‘void dfsdp(int)’: user.cpp:35:13: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (dp[y]<ans) ^