이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include <iostream>
#include <algorithm>
#include <sstream>
#include <vector>
#include <numeric>
using namespace std;
struct Trie {
Trie *next[26]{};
int max_depth = 0;
bool is_word = false;
void insert(const char *str) {
const int ch = *str - 'a';
if (!next[ch]) next[ch] = new Trie;
if (*(str + 1)) {
next[ch]->insert(str + 1);
max_depth = max(max_depth, 1 + next[ch]->max_depth);
} else next[ch]->is_word = true, max_depth = max(max_depth, 1);
}
};
void euler_tour(Trie *trie, stringstream &stream) {
vector<int> idx(26);
iota(idx.begin(), idx.end(), 0);
sort(idx.begin(), idx.end(), [trie](int i, int j) {
Trie *a = trie->next[i], *b = trie->next[j];
if (!a && b) return true;
if (a && !b) return false;
if (!a && !b) return false;
return a->max_depth < b->max_depth;
});
for (int i = 0; i < 26; ++i)
if (trie->next[idx[i]]) {
stream << (char)('a' + idx[i]);
if (trie->next[idx[i]]->is_word) stream << 'P';
euler_tour(trie->next[idx[i]], stream);
stream << '-';
}
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
int N;
string str;
Trie *trie = new Trie;
cin >> N;
for (int i = 0; i < N; ++i) {
cin >> str;
trie->insert(str.c_str());
}
stringstream stream;
euler_tour(trie, stream);
string ans = stream.str();
int i = 0;
for (int j = 0; j < (int)ans.size(); ++j)
if (ans[j] != '-') i = j;
cout << i + 1 << '\n';
for (int j = 0; j <= i; ++j)
cout << ans[j] << '\n';
return 0;
}
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