Compilare: user.cpp: In function ‘int main()’: user.cpp:18:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld %ld %ld %ld",&n,&x,&y,&k); ^ user.cpp:21:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%ld",&v[i]); ^ user.cpp:58:5: warning: ‘sf’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(inc>sf) ^ user.cpp:60:14: warning: ‘inc’ may be used uninitialized in this function [-Wmaybe-uninitialized] i=inc; ^