Compilare: user.cpp: In function ‘void BFS()’: user.cpp:22:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0; i<v[k].size(); ++i) ^ user.cpp:26:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[k].size(); ++i) ^ user.cpp:33:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v[k].size(); ++i) { ^ user.cpp:37:28: 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:66:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<sol.size(); ++i) ^