Submission #60045227

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#include <bits/stdc++.h>
using namespace std;
#define PI 3.141592653589793238462643383279502884L
#define LL long long
#define DD double
#define ULL unsigned long long
#define STR string
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;
#define MLL map<LL, LL>
#define MSL map<STR, LL>
#define MLB map<LL, bool>
template <class T>
using PQA = priority_queue<T, V<T>, greater<T>>;
template <class T>
using PQD = priority_queue<T, V<T>, less<T>>;
#define IT iterator
#define F first
 
 
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#include <bits/stdc++.h>

using namespace std;
#define PI 3.141592653589793238462643383279502884L
#define LL long long
#define DD double
#define ULL unsigned long long
#define STR string
template <class T>
using V = vector<T>;
template <class T>
using VV = V<V<T>>;
#define MLL map<LL, LL>
#define MSL map<STR, LL>
#define MLB map<LL, bool>
template <class T>
using PQA = priority_queue<T, V<T>, greater<T>>;
template <class T>
using PQD = priority_queue<T, V<T>, less<T>>;
#define IT iterator
#define F first
#define S second
#define PB push_back
#define PLL pair<LL, LL>
#define MP make_pair
#define rep(i, e) for (LL i = 0; i < e; i++)
#define repa(i, s, e) for (LL i = s; i < e; i++)
#define repd(i, s, e) for (LL i = s; i >= e; i--)
#define repauto(x, s) for (auto x : s)
#define rd(...) \
  __VA_ARGS__;  \
  read(__VA_ARGS__)
#define rdv(value, ...) \
  value(__VA_ARGS__);   \
  cin >> value
template <class T>
auto &operator>>(istream &is, vector<T> &xs)
{
  for (auto &x : xs)
    is >> x;
  return is;
}
template <class T>
auto &operator<<(ostream &os, vector<T> &xs)
{
  int sz = xs.size();
  rep(i, sz) os << xs[i] << " \n"[i + 1 == sz];
  return os;
}
template <class T, class Y>
auto &operator<<(ostream &os, pair<T, Y> &xs)
{
  os << "{" << xs.first << ", " << xs.second << "}";
  return os;
}
template <class T, class Y>
auto &operator>>(istream &is, vector<pair<T, Y>> &xs)
{
  for (auto &[x1, x2] : xs)
    is >> x1 >> x2;
  return is;
}
template <class... Args>
auto &read(Args &...args) { return (cin >> ... >> args); }
#define vsorta(v) sort(v.begin(), v.end())
#define vsortd(v) sort(v.begin(), v.end(), greater<>())
#define sort_arr(v, n) sort(v, v + n)
#define rev(v) reverse(v.begin(), v.end())
#define pr(x) cout << x
#define prs(x) cout << x << ' '
#define prn(x) cout << x << '\n'
#define prd() cout << fixed << setprecision(50);
#define Yes cout << "Yes\n"
#define YES cout << "YES\n"
#define No cout << "No\n"
#define NO cout << "NO\n"
#define PN cout << '\n'
#define PS cout << ' '
#define INF (1LL << 60)
#define MOD1 1000000007
#define MOD2 998244353
#define MAX_N 100100

void solve()
{
  STR rd(s);
  LL n = s.size();
  if (n % 2 == 1)
  {
    No;
    return;
  }
  map<char, LL> mp;
  rep(i, n)
  {
    if (i % 2 == 0 && s[i] != s[i + 1])
    {
      No;
      return;
    }
    mp[s[i]]++;
  }
  repauto(x, mp)
  {
    if (x.second != 2)
    {
      No;
      return;
    }
  }

  Yes;
}

int main()
{
  LL T = 1;
  // LL rd(T);
  while (T--)
    solve();
  return 0;
}

Submission Info

Judge Result