Compilare: user.cpp: In function ‘int main()’: user.cpp:32:13: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(d[i^(1<<p2)]>-1) ^ user.cpp:47:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(prod>0) ^ user.cpp:19:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lld%d" ,&n,&k); ^ user.cpp:21:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lld" ,&v[i]); ^ user.cpp:32:20: warning: ‘p2’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(d[i^(1<<p2)]>-1) ^