제출 #652566

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
652566		alvinpiter	Type Printer (IOI08_printer)	C++17	90 / 100	1073 ms	56440 KiB

printer

/*
* Insert each word into a trie
* "Add" operation is the same as going an edge downward, while "Remove" operation is the same as
  going an edge upward. If there is a requirement that the printer must be empty after all operations
  are performed, then the answer is 2 * numberOfEdgesInTheTrie + numberOfWords.
* However, we are allowed to leave some letters in the printer, so it is best if we leave the longest word in
  the printer.
*/

#include<bits/stdc++.h>
using namespace std;
#define MAX_NODE 500000

int numberOfNodesInTrie = 1; // Root is numbered 1
int trie[MAX_NODE + 3][26], maxDepth[MAX_NODE + 3];
bool isEndOfAWord[MAX_NODE + 3];

vector<char> result;

void insert(string s) {
  int currentNode = 1;
  for (int i = 0; i < s.length(); i++) {
    int charIndex = (s[i] - 'a');

    maxDepth[currentNode] = max(maxDepth[currentNode], (int) s.length() - i);
    if (trie[currentNode][charIndex] == -1) {
      trie[currentNode][charIndex] = ++numberOfNodesInTrie;
    }

    currentNode = trie[currentNode][charIndex];
  }

  isEndOfAWord[currentNode] = true;
}

void traverse(int currentNode) {
  if (isEndOfAWord[currentNode]) {
    result.push_back('P');
  }

  int deepestChildIdx = -1;
  for (int i = 0; i < 26; i++) {
    if (trie[currentNode][i] != -1 && (deepestChildIdx == -1 || maxDepth[trie[currentNode][i]] > maxDepth[trie[currentNode][deepestChildIdx]])) {
      deepestChildIdx = i;
    }
  }

  for (int i = 0; i < 26; i++) {
    if (trie[currentNode][i] != -1 && i != deepestChildIdx) {
      result.push_back((char) (i + 'a'));
      traverse(trie[currentNode][i]);
    }
  }

  if (deepestChildIdx != -1) {
    result.push_back((char) (deepestChildIdx + 'a'));
    traverse(trie[currentNode][deepestChildIdx]);
  }

  result.push_back('-');
}

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  cout.tie(nullptr);

  int n;
  cin >> n;

  memset(trie, -1, sizeof(trie));
  memset(maxDepth, 0, sizeof(maxDepth));
  memset(isEndOfAWord, false, sizeof(isEndOfAWord));
  for (int i = 0; i < n; i++) {
    string s;
    cin >> s;

    insert(s);
  }

  traverse(1);

  while (result.back() == '-') {
    result.pop_back();
  }

  cout << result.size() << endl;
  for (auto r: result) {
    cout << r << endl;
  }
}

컴파일 시 표준 에러 (stderr) 메시지

printer.cpp: In function 'void insert(std::string)':
printer.cpp:22:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |   for (int i = 0; i < s.length(); i++) {
      |                   ~~^~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 0 / 10