Compilare: user.cpp: In function ‘int main()’: user.cpp:41:23: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] val+=(1<<x-1); ^ user.cpp:12:23: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%i",&q); ^ user.cpp:17:33: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(si,"%i %i",&n,&k); ^ user.cpp:13:21: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] int j,n,k,val,i,x,l; ^