1033.继续XXX定律

#include<iostream>
using namespace std;

int change(int x){
    if(x%2==0) return x/2;
    else return (3*x+1)/2; 
}

int main(){
    int n,i,a;
    while(cin>>n){
        int s[501]={0};
        int b[1002]={0};
        for(i=0;i<n;i++){
            cin>>s[i];
            a=s[i];
            b[a]=1;
            while(a!=1){
                a=change(a);
                b[a]=0;
            }
        }
        bool first=true;
        for(i=n-1;i>=0;i--){
           if(b[s[i]]==1) {
               if(first){
                   first=false;
                   cout<<b[s[i]];
               }
               else cout<<" "<<b[s[i]];
           }
    }
    cout<<endl;
    }
    return 0;
}