Submission #2831935

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Source Code Expand

#include "bits/stdc++.h"
using namespace std;
#define MOD 1000000007
#define INF 1LL<<50
#define fst first
#define sec second
#define pb push_back
#define int long long
#define ALL(obj) (obj).begin(), (obj).end()
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define RFOR(i,a,b) for(int i = (b-1);i>=a;i--)
#define REP(i,n)  FOR(i,0,n)
#define RREP(i,n) RFOR(i,0,n)
#define ITR(itr,mp) for(int itr = (mp).begin(); itr != (mp).end(); ++itr)
#define RITR(itr,mp) for(int itr = (mp).rbegin(); itr != (mp).rend(); ++itr)
#define debug(x)  cout << #x << " = " << (x) << endl;
typedef long long ll;
typedef pair<ll,ll> P;

signed main(){
  ios::sync_with_stdio(false);
  cin.tie(0);

  int n;
  cin >> n;
  
  map<int,int>mp;
  int a;
  REP(_,n){
    cin >> a;
    if(a > n-1){
      cout << "No" << endl;
      return 0;
    }
    mp[a]++;
  }
  
  if(mp.size() == 1){
    if(a <= n/2 || a == n-1) cout << "Yes" << endl;
    else		 cout << "No"  << endl;
    return 0;
  }
    
  
  auto itr = mp.begin();
  a = itr->fst;
  int num = itr->sec;
  itr++;
  
  if(mp.size() > 2 || itr->fst != a+1){
    cout << "No" << endl;
    return 0;
  }
  
  if(num <= a && a+1 <= num + itr->sec/2){
    cout << "Yes" << endl;
  }
  
  else cout << "No" << endl;

  return 0;
}

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