View Compilation Error

0_0_20326271_26111.cpp: In function 'int main()':
0_0_20326271_26111.cpp:44:19: error: invalid initialization of reference of type 'long long int&' from expression of type 'int'
    exgcd(aa,bb,x,y);
                   ^
0_0_20326271_26111.cpp:11:6: note: in passing argument 3 of 'void exgcd(long long int, long long int, long long int&, long long int&)'
 void exgcd(long long a, long long b,long long &x,long long &y)
      ^