Compilare: user.cpp: In function ‘int main()’: user.cpp:50:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k = 0; k < G[j].size(); k++) { ^ user.cpp:34:24: warning: unused variable ‘a’ [-Wunused-variable] int i, j, k, n, m, a, b, c, initNG; ^ user.cpp:34:27: warning: unused variable ‘b’ [-Wunused-variable] int i, j, k, n, m, a, b, c, initNG; ^ user.cpp:34:30: warning: unused variable ‘c’ [-Wunused-variable] int i, j, k, n, m, a, b, c, initNG; ^