Submission #2548939

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
int main(){
  long long n,m;
  cin >> m >> n;
  long long a[n];
  map<long long,long long> mp;
  for(int i=0;i<n;i++){
    cin >> a[i];
  }
  for(int i=n-1;i>=0;i--){
    if(mp[a[i]]==0){
      cout << a[i] << endl;
      mp[a[i]]++;
    }
  }
  for(int i=1;i<=m;i++){
    if(mp[i]==0){
      cout << i << endl;
    }
  }
  return 0;
}

Submission Info

Judge Result