Compilare: user.cpp: In function ‘int main()’: user.cpp:76:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=1; j<v[i].size(); j++) ^ user.cpp:52:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:55:55: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&a[i].x,&a[i].y,&a[i].r); ^