70,求调

#include<iostream>
using namespace std;
int a[25]={2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536,131072,262144,524288,1048576,2097152,4194304,8388608,16777216};
int main(){
    int n;cin>>n;
    if(n%2==1) {cout<<"-1";return 0;}
    while(n!=0) {
        for(int i=1;i<=25;i++){
            if(2*a[i]>n) {cout<<a[i];n-=a[i];break;}
        }
        continue;
    }
    return 0;
}