foo.cpp: In function 'int main()':
foo.cpp:39:24: error: invalid initialization of reference of type 'int&' from expression of type 'll {aka long long int}'
         gcd(a,b,g,sx,sy);
                        ^
foo.cpp:9:6: error: in passing argument 3 of 'void gcd(int, int, int&, int&, int&)'
 void gcd(int a,int b,int &d,int &x,int &y)
      ^
foo.cpp:47:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'll {aka long long int}' [-Wformat=]
         printf("%d\n",(t+b)%b);
                              ^