Compilare: user.cpp: In function ‘int main()’: user.cpp:11:19: warning: unused variable ‘ctx’ [-Wunused-variable] int n,dx,dy,i,ctx=0,cty=0,distx=0,disty=0,dist; ^ user.cpp:11:25: warning: unused variable ‘cty’ [-Wunused-variable] int n,dx,dy,i,ctx=0,cty=0,distx=0,disty=0,dist; ^ user.cpp:12:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d%d",&n,&dx,&dy); ^ user.cpp:15:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d",&x[i],&y[i]); ^