Compilare: user.cpp: In function ‘int main()’: user.cpp:102:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<a[i][x].v.size();++j) ^ user.cpp:91:35: warning: unused variable ‘lung’ [-Wunused-variable] piesa aux;bool ales=false;int lung; ^ user.cpp:42:20: warning: ‘start’ may be used uninitialized in this function [-Wmaybe-uninitialized] viz[start]=true; ^