1056 组合数的和

#include<iostream>
using namespace std;

int main() {
    int n,a[10],sum = 0;
    cin>>n;
    for(int i = 0; i < n; ++i)
        cin>>a[i];
    for(int i = 0; i < n; ++i) {
        int t = a[i];
        for(int j = 0; j < n; ++j)
            if(j != i)
                sum += t*10+a[j];
    }
    cout<<sum;
    return 0;
}