Compilare: user.cpp: In function ‘void afisrez()’: user.cpp:43:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();i++) ^ user.cpp: In function ‘void kruskal()’: user.cpp:59:13: warning: unused variable ‘x’ [-Wunused-variable] int x=v[i].x; ^ user.cpp:60:13: warning: unused variable ‘y’ [-Wunused-variable] int y=v[i].y; ^ user.cpp: In function ‘int main()’: user.cpp:90:13: warning: unused variable ‘x’ [-Wunused-variable] int x=v[i].x; ^ user.cpp:91:13: warning: unused variable ‘y’ [-Wunused-variable] int y=v[i].y; ^