Compilare: main.c: In function 'main': main.c:18:14: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] x=x+(1<<n-i); ~^~ main.c:31:24: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] x=x+v2[j-1]*(1<<n-j); ~^~ main.c:13:3: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &n); ^~~~~~~~~~~~~~~~~~~~