Compilare: main.cpp: In function 'void dfs(int)': main.cpp:95:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<G[start].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp: In function 'void dfs1(int)': main.cpp:114:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<GT[start].size();i++) ~^~~~~~~~~~~~~~~~~ main.cpp: In function 'void bkt(int)': main.cpp:140:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(it = 0;it < G[sol[k-1]].size();it++) ~~~^~~~~~~~~~~~~~~~~~~~