Compilare: user.cpp: In function ‘int main()’: user.cpp:25:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:27:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&x,&y,&m); ^ user.cpp:41:23: warning: ‘end’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[i].st>=end){ ^