Compilare: user.cpp: In function ‘int main()’: user.cpp:7:9: warning: unused variable ‘n’ [-Wunused-variable] int n,a[100],b[100],q[100],k,x0,y0,x1,y1,i,c=1; ^ user.cpp:7:46: warning: unused variable ‘i’ [-Wunused-variable] int n,a[100],b[100],q[100],k,x0,y0,x1,y1,i,c=1; ^ user.cpp:11:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&a[1],&b[1]); ^