Compilare: user.cpp: In function ‘int main()’: user.cpp:13:25: warning: unused variable ‘i’ [-Wunused-variable] int v[100001],n,a,b,i,nr1=0,nr2=0,x,k,len; ^ user.cpp:13:43: warning: unused variable ‘len’ [-Wunused-variable] int v[100001],n,a,b,i,nr1=0,nr2=0,x,k,len; ^