/in/foo.cc: In function 'int main()':
/in/foo.cc:43:62: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'll* {aka long long int*}' [-Wformat=]
  scanf("%I64d%I64d%I64d%I64d%I64d%I64d",&a1,&b1,&a2,&b2,&L,&R);
                                                              ^
/in/foo.cc:43:62: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'll* {aka long long int*}' [-Wformat=]
/in/foo.cc:43:62: warning: format '%d' expects argument of type 'int*', but argument 4 has type 'll* {aka long long int*}' [-Wformat=]
/in/foo.cc:43:62: warning: format '%d' expects argument of type 'int*', but argument 5 has type 'll* {aka long long int*}' [-Wformat=]
/in/foo.cc:43:62: warning: format '%d' expects argument of type 'int*', but argument 6 has type 'll* {aka long long int*}' [-Wformat=]
/in/foo.cc:43:62: warning: format '%d' expects argument of type 'int*', but argument 7 has type 'll* {aka long long int*}' [-Wformat=]
/in/foo.cc:49:5: warning: unused variable 'gcd_' [-Wunused-variable]
  ll gcd_=exgcd(a_,b_,x0,y0);
     ^~~~