Submission #60040364

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Source Code Expand

#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <map>
#include <atcoder/all>
using namespace std;

#define REP(i, n) for (int i = 0; i < n; i++)
#define FOR(i, l, r) for (int i = l; i <= r; i++)
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)

using ll = long long;
using VI = vector<int>;
using VL = vector<ll>;
using VVI = vector<VI>;
using VVL = vector<VL>;

ll op(ll a, ll b) { return a + b; }
ll e() { return 0; }

bool check(string s){
    int n = s.size();
    if (n % 2 == 1) return false;
    REP(i,n/2){
        if (s[2*i] != s[2*i+1]) return false;
    }
    map<char, int> mp;
    REP(i,n){
        mp[s[i]]++;
    }
    for (auto p : mp){
        if (p.second != 2) return false;
    }
    return true;
}

int main()
{
    string s;
    cin >> s;
    cout << (check(s) ? "Yes" : "No") << endl;
}

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