Compilare: user.cpp: In function ‘int main()’: user.cpp:120:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[v].size(); ++i){ ^ user.cpp:85:13: warning: unused variable ‘s’ [-Wunused-variable] int n,m,s,e,i,j,x,y,z; ^ user.cpp:85:15: warning: unused variable ‘e’ [-Wunused-variable] int n,m,s,e,i,j,x,y,z; ^ user.cpp:85:19: warning: unused variable ‘j’ [-Wunused-variable] int n,m,s,e,i,j,x,y,z; ^