Compilare: main.cpp: In function 'int check(int, long long int&)': main.cpp:65:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0 ; j < sf[i].size() ; j++){ ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:84:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d",&n,&m); ^ main.cpp:86:58: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d",&v[i].x , &v[i].y , &v[i].z); ^