Submission #72574871

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Source Code Expand

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

using ll = long long;
using ld = long double;
#define rep(i, n) for(int i = 0; i < (int) (n); i ++)
#define rrep(i, m, n) for(int i = (int) m; i < (int) n; i ++)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};
const int ddx[8] = {1, 1, 0, -1, -1, -1, 0, 1};
const int ddy[8] = {0, 1, 1, 1, 0, -1, -1, -1};

long long gcd(long long a, long long b){
    if(a % b == 0) return b;
    else return gcd(b, a % b);
}

long long lcm(long long a, long long b){
    return a * b / gcd(a, b);
}

template<typename T>
void v_cin(vector<T> &x){
    rep(i, x.size()) cin >> x[i];
}

template<typename T>
void vv_cin(vector<vector<T>> &x){
    rep(i, x.size()) rep(j, x[i].size()) cin >> x[i][j];
}

template <typename T>
void v_cout(vector<T> &x){
    rep(i, x.size()) cout << x[i] << (i < x.size() - 1 ? " " : "\n");
}

template <typename T>
void vv_cout(vector<vector<T>> &x){
    rep(i, x.size()) v_cout(x[i]);
}

// #include <atcoder/all>
// using namespace atcoder;
// using mint = modint998244353;
// using mint = modint1000000007;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int N; cin >> N;
    vector<string> S(N); v_cin(S);
    vector<pair<int, char>> v;
    rep(i, N){
        v.push_back({S[i].size(), S[i][0]});
    }

    sort(rall(v));

    rep(i, N){
        cout << (char) toupper(v[i].second);
    }
    cout << "\n";
}

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