이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
struct Node{
Node* c[26];
int maxdepth=0;
Node(){
for(int i=0;i<26;i++) c[i]=nullptr;
}
};
Node* root=new Node();
void insert(string s){
Node* node=root;
int n=s.length();
for(int i=0;i<n;i++){
if(node->c[s[i]-'a']==nullptr) node->c[s[i]-'a'] = new Node();
node=node->c[s[i]-'a'];
node->maxdepth=max(node->maxdepth,n);
}
}
int k;
vector<char> op;
void dfs(Node* node){
vector<pair<int,int>> v;
for(int i=0;i<26;i++){
if(node->c[i]){
v.push_back({node->c[i]->maxdepth,i});
}
}
if(v.empty()){
k--;
op.push_back('P');
return;
}
sort(v.begin(),v.end());
for(auto x:v){
op.push_back(char('a'+x.second));
dfs(node->c[x.second]);
if(k!=0){
op.push_back('-');
}
}
}
signed main(){
int n;
cin>>n;
k=n;
vector<string> v(n);
for(int i=0;i<n;i++){
cin>>v[i];
insert(v[i]);
}
dfs(root);
cout<<op.size()<<endl;
for(auto x:op){
cout<<x<<endl;
}
}
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