> #include "iostream"
> #include "cmath"
> using namespace std;
> #define ABS(a) ((a)>=0?(a):-(a))
> int main()
> {
> int x,y,m,n,L;
> cin>>x>>y>>m>>n>>L;
> int steps=0;
> if(x==y||((x-y+L)%L)%ABS(m-n))
> {
> cout<<"Impossible";
> }
> else
> {
> do {
> ++steps;
> } while((x+=m)%L!=(y+=n)%L);
> cout<<steps<<endl;
> }
> return 0;
> }
> 怎样的算法？
> 这哪错啊
>