/in/foo.cc:3:9: error: '__int64' does not name a type
 typedef __int64 ll;
         ^~~~~~~
/in/foo.cc:4:1: error: 'll' does not name a type
 ll x,y,n,m,l;
 ^~
/in/foo.cc:5:1: error: 'll' does not name a type
 ll gcd(ll a,ll b)
 ^~
/in/foo.cc:9:12: error: variable or field 'exgcd' declared void
 void exgcd(ll a,ll b,ll &xx,ll &yy)
            ^~
/in/foo.cc:9:12: error: 'll' was not declared in this scope
/in/foo.cc:9:17: error: 'll' was not declared in this scope
 void exgcd(ll a,ll b,ll &xx,ll &yy)
                 ^~
/in/foo.cc:9:22: error: 'll' was not declared in this scope
 void exgcd(ll a,ll b,ll &xx,ll &yy)
                      ^~
/in/foo.cc:9:26: error: 'xx' was not declared in this scope
 void exgcd(ll a,ll b,ll &xx,ll &yy)
                          ^~
/in/foo.cc:9:29: error: 'll' was not declared in this scope
 void exgcd(ll a,ll b,ll &xx,ll &yy)
                             ^~
/in/foo.cc:9:33: error: 'yy' was not declared in this scope
 void exgcd(ll a,ll b,ll &xx,ll &yy)
                                 ^~