Compilare: user.cpp: In function ‘int cealalta()’: user.cpp:21:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < rez.size(); ++i) ^ user.cpp: In function ‘void topSort(int)’: user.cpp:36:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[x].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:48:12: warning: unused variable ‘a’ [-Wunused-variable] int i, a, b, c; ^