Compilare: user.cpp: In function ‘int main()’: user.cpp:51:9: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(viz[i]==0) ^ user.cpp:13:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d %d " ,&n,&x,&y); ^ user.cpp:15:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d " ,&v[i].x,&v[i].y); ^