Compilare: main.cpp: In function 'void Prim()': main.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graf[1].size(); i++) ~~^~~~~~~~~~~~~~~~ main.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graf[elem.second.first].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graf[elem.second.second].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~