Compilare: user.cpp: In function ‘void get_sets(int)’: user.cpp:46:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<prs.size() && prs[i]*prs[i]<=arg; ++i) { ^ user.cpp: In function ‘int pinex(int)’: user.cpp:70:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<prs.size() && prs[i]*prs[i]<=arg; ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:99:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d",&n,&m); ^