Compilare: main.cpp: In function 'void bfs()': main.cpp:50:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void prim()': main.cpp:73:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[1].size(); i++) ~^~~~~~~~~~~~ main.cpp:110:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:148:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<s.size(); j++) ~^~~~~~~~~