Compilare: main.cpp: In function 'void bfs(int)': main.cpp:47:22: 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:70:58: warning: self-comparison always evaluates to true [-Wtautological-compare] if(edge[i].first==edge[i-1].first&&edge[i].second==edge[i].second){ ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ 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:85:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<mdelete[i].size();j++){ ~^~~~~~~~~~~~~~~~~~ main.cpp:111:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<madd[i].size();j++){ ~^~~~~~~~~~~~~~~ main.cpp:78:11: warning: variable 'y' set but not used [-Wunused-but-set-variable] int x,y; ^