Compilare: user.cpp: In function ‘int main()’: user.cpp:53:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<apm.size(); j++) ^ user.cpp:39:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ user.cpp:41:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&P[i].x,&P[i].y); ^