Compilare: user.cpp: In function ‘void MinusGrad(int)’: user.cpp:15:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[k].size(); ++i) ^ user.cpp: In function ‘void BFS()’: user.cpp:27:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[k].size(); ++i) { ^ user.cpp:37:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[k].size(); ++i) ^ user.cpp:20:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,k,nr; ^ user.cpp:20:15: warning: unused variable ‘nr’ [-Wunused-variable] int i,j,k,nr; ^ user.cpp: In function ‘int main()’: user.cpp:57:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[X].size(); ++i) { ^ user.cpp:66:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<sol.size(); ++i) ^