20 分代码 
#include<bits/stdc++.h>
using namespace std;

//dp[]i


unsigned long long dp[1100];
unsigned long long a[1100] , num;
int main(){
    char s;
    while( cin >> s ){
        if( s == EOF ) break;
        a[ ++ num ] = s - '0';
    }

    unsigned long long p = 1;

    for(int i = 1 ; i <= num ; i ++ ){
        dp[i] = dp[i - 1] * 2 + p * a[i] ;
        p *= 2;
        //cout << i <<"  " << dp[i] << endl;
    }
    cout << dp[num];
}




100 分代码 

#include<bits/stdc++.h>
using namespace std;

//dp[]i


unsigned long long dp[1100];
unsigned long long a[1100] , num;
int main(){
    int s;
    while( cin >> s ){
        //if( s == EOF ) break;
        a[ ++ num ] = s;
    }

    unsigned long long p = 1;

    for(int i = 1 ; i <= num ; i ++ ){
        dp[i] = dp[i - 1] * 2 + p * a[i] ;
        p *= 2;
        //cout << i <<"  " << dp[i] << endl;
    }
    cout << dp[num];
}

数字超过一位注意char只能读一个