代码

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
const int N = 20;

int main(void) {
  vector<int> nums(N);
  for (int i = 0; i < N; ++i) cin >> nums[i];

  reverse(begin(nums), end(nums));
  for (int i = 0; i < N; ++i)
    printf("N[%d] = %d\n", i, nums[i]);

  return 0;
}