Compilare: main.cpp: In function 'void bfs()': main.cpp:51:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<v[x].size();i++) if(viz[v[x][i].first] == 0) ~^~~~~~~~~~~~ main.cpp:55:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<s1.size();j++) if (s1[j]=='E') e=true; ~^~~~~~~~~~