Compilare: user.cpp: In function ‘int main()’: user.cpp:47:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < x.size(); i++ ) { ^ user.cpp:23:9: warning: unused variable ‘fi’ [-Wunused-variable] int fi,fj,cost; ^ user.cpp:23:12: warning: unused variable ‘fj’ [-Wunused-variable] int fi,fj,cost; ^ user.cpp:23:15: warning: unused variable ‘cost’ [-Wunused-variable] int fi,fj,cost; ^ user.cpp:48:17: warning: ‘aux’ may be used uninitialized in this function [-Wmaybe-uninitialized] if( x[i].i == a) { ^