Compilare: user.cpp: In function ‘int main()’: user.cpp:46:22: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ user.cpp:48:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&v[i]); ^ user.cpp:62:13: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<len<<'\n'; ^~~~