0_0_30880607_18728.cpp: In function 'll solve()':
0_0_30880607_18728.cpp:30:27: error: invalid initialization of reference of type 'll& {aka long long int&}' from expression of type 'int'
d = gcd(M,m[i],x,y);
^
0_0_30880607_18728.cpp:6:4: note: in passing argument 3 of 'll gcd(ll, ll, ll&, ll&)'
ll gcd(ll a,ll b,ll &x,ll &y)
^
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