Compilare: user.cpp: In function ‘bool exista(int, int)’: user.cpp:20:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k = 0; k < v[i].size(); ++k) ^ user.cpp: In function ‘int cealalta()’: user.cpp:31:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < rez.size(); ++i) ^ user.cpp:37:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < rez.size(); ++i) ^ user.cpp: In function ‘void topSort(int)’: user.cpp:62:34: 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:92:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < rez.size(); ++j) ^ user.cpp:74:12: warning: unused variable ‘a’ [-Wunused-variable] int i, a, b, c; ^