Compilare: user.cpp: In function ‘int main()’: user.cpp:20:25: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] vv[++o]=(v[i]<<i-1); ^ user.cpp:23:5: warning: unused variable ‘nrnou’ [-Wunused-variable] int nrnou=0; ^ user.cpp:8:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d",&a,&n); ^