Compilare: main.cpp: In function 'void bfs(int)': main.cpp:48:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<G[aux].size();i++){ ~^~~~~~~~~~~~~~ main.cpp: In function 'void add_edges()': main.cpp:77:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<mdelete[i].size();j++){ ~^~~~~~~~~~~~~~~~~~ main.cpp:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<mdelete[i].size();j++){ ~^~~~~~~~~~~~~~~~~~ main.cpp:107:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<madd[i].size();j++){ ~^~~~~~~~~~~~~~~ main.cpp:74:11: warning: variable 'y' set but not used [-Wunused-but-set-variable] int x,y; ^