Compilare: user.cpp: In function ‘int main()’: user.cpp:14:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld",&t); ^ user.cpp:17:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%lld %lld",&n,&r); ^ user.cpp:33:7: warning: ‘ok’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(ok==true) {fprintf(g,"%lld\n",j); break;} ^