제출 #890186

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
890186		avighna	Snake Escaping (JOI18_snake_escaping)	C++17	0 / 100	18 ms	65536 KiB

snake_escaping

#include <bits/stdc++.h>

using namespace std;

const int L = 20;

using Node = map<int, int>;

string s;

Node seg[1 << (L + 2)];
bool need[L][3][3];

string conv(int x) {
  string ans;
  while (x > 0) {
    int d = x % 3;
    x /= 3;
    ans.push_back(d + '0');
  }
  for (auto &i : ans) {
    if (i == '2') {
      i = '?';
    }
  }
  return ans;
}

void construct(int v, int tl, int tr, int d) {
  if (tl == tr) {
    seg[v][0] = s[tl] - '0';
    return;
  }

  int tm = (tl + tr) / 2;
  construct(2 * v, tl, tm, d + 1);
  construct(2 * v + 1, tm + 1, tr, d + 1);

  for (auto &i : seg[2 * v]) {
    if (need[d][0][i.first % 3]) {
      seg[v][3 * i.first] = i.second;
    }
    if (need[d][2][i.first % 3]) {
      seg[v][3 * i.first + 2] = seg[2 * v][i.first] + seg[2 * v + 1][i.first];
    }
  }
  for (auto &i : seg[2 * v + 1]) {
    if (need[d][1][i.first % 3]) {
      seg[v][3 * i.first + 1] = i.second;
    }
  }

  seg[2 * v].clear();
  seg[2 * v + 1].clear();

  // cout << "seg[" << tl << "-" << tr << "] contains:\n";
  // for (auto &i : seg[v]) {
  //   cout << conv(i.first) << "\n";
  // }
  // cout << "\n";
}

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

  int l, q;
  cin >> l >> q;
  cin >> s;

  vector<int> queries;
  while (q--) {
    string sq;
    cin >> sq;
    int x = 0;
    for (char &c : sq) {
      if (c == '?') {
        c = '2';
      }
    }
    for (int i = sq.length() - 1; i >= 0; --i) {
      x = 3 * x + (sq[i] - '0');
      if (i != sq.length() - 1) {
        need[i][sq[i] - '0'][sq[i + 1] - '0'] = true;
      } else {
        for (int j = 0; j < 3; ++j) {
          for (int k = 0; k < 3; ++k) {
            need[i][j][k] = true;
          }
        }
      }
    }
    queries.push_back(x);
  }

  construct(1, 0, (1 << l) - 1, 0);
  // cout << "sz = " << seg[1].size() << "\n";
  for (auto &i : queries) {
    // pair<int, int> p = {i, 0};
    // cout << get(seg[1]) << "\n";
    cout << seg[1][i] << "\n";
  }
}

컴파일 시 표준 에러 (stderr) 메시지

snake_escaping.cpp: In function 'int main()':
snake_escaping.cpp:83:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   83 |       if (i != sq.length() - 1) {
      |           ~~^~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 10
• Subtask 4: 0 / 53
• Subtask 5: 0 / 25