PAT (Basic Level) Practice （中文）1056 组合数的和 (15 分)

本题不难，下面是完整的代码

#include<iostream>
#include<math.h>
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++) {
  for (int j = 0; j < n; j++) {
   if (i != j) {
    sum = sum + a[i] * 10 + a[j];
   }
  }
 }
 cout << sum;
 return 0;
}