Compilare: user.cpp: In function ‘int main()’: user.cpp:29:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d",&n); ^ user.cpp:32:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin,"%d%d%d%d",&a,&b,&c,&d); ^ user.cpp:28:34: warning: ‘min2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,i,a,b,c,d,o,v,sol,min1,min2,j,k,x; ^~~~