제출 #890128

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
890128		avighna	Snake Escaping (JOI18_snake_escaping)	C++17	0 / 100	13 ms	65536 KiB

snake_escaping

#include <bits/stdc++.h>

using namespace std;

const int L = 20;

class Node {
public:
  vector<pair<int, int>> x;
};

string s;

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

void construct(int v, int tl, int tr, int d) {
  if (tl == tr) {
    seg[v].x.push_back({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);
  seg[v].x.reserve(accumulate(need[d], need[d] + 3, 0) * seg[2 * v].x.size());
  for (int i = 0; i < 3; ++i) {
    if (!need[d][i]) {
      continue;
    }
    for (int j = 0; j < seg[2 * v].x.size(); ++j) {
      pair<int, int> p = {j, 0};
      if (i == 0) {
        seg[v].x.push_back(
            {3 * j + i,
             lower_bound(seg[2 * v].x.begin(), seg[2 * v].x.end(), p)->second});
      } else if (i == 1) {
        seg[v].x.push_back({3 * j + i, lower_bound(seg[2 * v + 1].x.begin(),
                                                   seg[2 * v + 1].x.end(), p)
                                           ->second});
      } else {
        seg[v].x.push_back(
            {3 * j + i,
             lower_bound(seg[2 * v].x.begin(), seg[2 * v].x.end(), p)->second +
                 lower_bound(seg[2 * v + 1].x.begin(), seg[2 * v + 1].x.end(),
                             p)
                     ->second});
      }
    }
  }
  seg[2 * v].x.clear();
  seg[2 * v + 1].x.clear();
  sort(seg[v].x.begin(), seg[v].x.end());
}

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 (int i = sq.length() - 1; i >= 0; --i) {
      char c = sq[i];
      if (c == '?') {
        c = '2';
      }
      x = 3 * x + (c - '0');
      need[i][c - '0'] = true;
    }
    queries.push_back(x);
  }

  construct(1, 0, (1 << l) - 1, 0);
  for (auto &i : queries) {
    pair<int, int> p = {i, 0};
    cout << lower_bound(seg[1].x.begin(), seg[1].x.end(), p)->second << "\n";
  }
}

컴파일 시 표준 에러 (stderr) 메시지

snake_escaping.cpp: In function 'void construct(int, int, int, int)':
snake_escaping.cpp:31:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |     for (int j = 0; j < seg[2 * v].x.size(); ++j) {
      |                     ~~^~~~~~~~~~~~~~~~~~~~~

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