Compilare: user.cpp: In function ‘void df(int, int)’: user.cpp:15:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b[id].size();i++) ^ user.cpp:30:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<b[fi].size();i++) ^ user.cpp:37:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<a[nod].size();i++) df(a[nod][i],val+sume[nod]); ^ user.cpp: In function ‘int main()’: user.cpp:42:5: warning: unused variable ‘h’ [-Wunused-variable] dat h; ^ user.cpp:43:7: warning: unused variable ‘y’ [-Wunused-variable] int x,y; ^ user.cpp: In function ‘void df(int, int)’: user.cpp:38:15: warning: ‘id2’ may be used uninitialized in this function [-Wmaybe-uninitialized] b[id][id2].nr--; ^