Compilare: user.cpp: In function ‘void BFS()’: user.cpp:23:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[k].size(); ++i) ^ user.cpp:27:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[k].size(); ++i) ^ user.cpp:34:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[k].size(); ++i) { ^ user.cpp:38:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<v[urm].size(); ++j) ^ user.cpp: In function ‘int main()’: user.cpp:67:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<sol.size(); ++i) ^