/in/foo.cc: In function 'int gcd(int, int)':
/in/foo.cc:25:15: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
     while(r=x%y)x=y,y=r;
               ^
/in/foo.cc: In function 'void solve(int, int, fr)':
/in/foo.cc:91:27: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
             sum[j]=sum[j^j&-j]+(fr){1,v[__builtin_ctz(j)]};
                          ~^~~