Compilare: user.cpp: In function ‘void solve()’: user.cpp:24:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[aux].size(); i++) ^ user.cpp: In function ‘void tip()’: user.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v[i].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:43:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y; ^