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求助．好心人能指点迷津吗？
#include <iostream.h>
int main()
{
long x,y,m,n,l,i,s;
i=1;
cin>>x>>y>>m>>n>>l;
s=x-y;
while (x-y+i*(m-n)%l!=s)
{
i++;
if ((x+i*m)%l==(y+i*n)%l)
{
cout<<i;
break;
}
}
if (x-y+i*(m-n)%l==s) cout<<"Impossible"<<"\n";
return 0;
}
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