Submission #3430567

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Source Code Expand

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

int main() {
  bool used[100010] = {};
  int n, m;
  cin >> n >> m;
  int a[100010];
  for (int i = 0; i < m; i++) cin >> a[i];
  for (int i = m - 1; i >= 0; i--) {
    if (!used[a[i]]) {
      cout << a[i] << endl;
      used[a[i]] = true;
    }
  }
  for (int i = 1; i <= n; i++) {
    if (!used[i]) {
      cout << i << endl;
    }
  }
  return 0;
}

Submission Info

Judge Result