View Compilation Error

0_0_24870227_30047.cpp:59:9: error: '::main' must return 'int'
 LL main()
         ^
0_0_24870227_30047.cpp: In function 'int main()':
0_0_24870227_30047.cpp:74:33: error: invalid initialization of reference of type 'int&' from expression of type 'LL {aka long long int}'
    k = C / Gcd, gcd(A, B, t1, t2), t1 *= k, t2 *= k;
                                 ^
0_0_24870227_30047.cpp:50:4: note: in passing argument 3 of 'LL gcd(LL, LL, int&, int&)'
 LL gcd(LL x, LL y, int& a, int& b)
    ^