/in/foo.cc: In function 'long long int get(long long int)':
/in/foo.cc:28:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'long long int zgsydl(long long int, long long int, long long int, long long int)':
/in/foo.cc:62:32: warning: 'x' is used uninitialized in this function [-Wuninitialized]
  ll x,y,lcm=n*m; exgcd(n,m,x,y);
                                ^
/in/foo.cc:62:32: warning: 'y' is used uninitialized in this function [-Wuninitialized]