View Compilation Error

0_0_31043670_25002.cpp: In function 'int main()':
0_0_31043670_25002.cpp:41:25: error: invalid initialization of reference of type 'long long int&' from expression of type 'int'
         exgcd(a, b, x, y);
                         ^
0_0_31043670_25002.cpp:25:4: note: in passing argument 3 of 'long long int exgcd(long long int, long long int, long long int&, long long int&)'
 ll exgcd(ll a, ll b, ll &x, ll &y) {
    ^