Compilare: user.cpp: In function ‘void Kruskal(Graph&)’: user.cpp:57:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G.size(); i++) ^ user.cpp: In function ‘void Prim(Graph&)’: user.cpp:102:7: warning: unused variable ‘cost’ [-Wunused-variable] int cost = q.top().first; ^ user.cpp:119:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < dist.size(); i++) ^ user.cpp:125:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < dist.size(); i++) ^