oj.uz

Submission #494916

# Submission time Handle Problem Language Result Execution time Memory
494916 2021-12-17T13:14:58 Z Christopher_ Mecho (IOI09_mecho) C++17
84 / 100
 607 ms 17332 KB 
#include <bits/stdc++.h>

using namespace std;


#define int long long

#define ar array

const int mxN = 800;
const int dx[] = {0, 1, 0, -1}, dy[] = {1, 0, -1, 0};
int n, K;
vector<string> g(mxN);
pair<int,int> mecho, home;
vector<pair<int,int>> hives;
vector<vector<int>> disthives(mxN, vector<int>(mxN, (int) 1e11)), dist(mxN, vector<int>(mxN, (int) 1e11));

bool checkhives(int x, int y) {
  return x >= 0 && x < n && y >= 0 && y < n && g[x][y] == 'G' && disthives[x][y] == (int) 1e11;
}

bool checkbeer(int DIST, int x, int y) {
  return x >= 0 && x < n && y >= 0 && y < n && g[x][y] != 'T' && g[x][y] != 'H' && disthives[x][y] > DIST && dist[x][y] == (int) 1e11;
}

void bfs(int m) {
  priority_queue<ar<int, 3>, vector<ar<int, 3>>, greater<ar<int, 3>>> pq;
  pq.push({m, mecho.first, mecho.second});
  while (!pq.empty()) {
    int d = pq.top()[0], x = pq.top()[1], y = pq.top()[2]; pq.pop();
    if (dist[x][y] < d) {
      continue;
    }
    for (int k = 0; k < 4; ++k) {
      int nx = x + dx[k], ny = y + dy[k];
      int DIST = (d + 1) / K;
      // if ((d + 1) % K) {
      //   ++DIST;
      // }
      if (checkbeer(DIST, nx, ny)) {
        pq.push({d + 1, nx, ny});
        dist[nx][ny] = d + 1;
      }
    }
  }
  // cout << dist[home.first][home.second] << '\n';
  // for (int i = 0; i < n; ++i) {
  //   for (int j = 0; j < n; ++j) {
  //     cout << dist[i][j] << ' ';
  //   }
  //   cout << '\n';
  // }
}
int32_t main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cin >> n >> K;
  for (int i = 0; i < n; ++i) {
    cin >> g[i];
    for (int j = 0; j < n; ++j) {
      if (g[i][j] == 'M') {
        mecho = {i, j};
      } else if (g[i][j] == 'D') {
        home = {i, j};
      } else if (g[i][j] == 'H') {
        hives.push_back({i, j});
        disthives[i][j] = 0;
      }
    }
  }
  priority_queue<ar<int, 3>, vector<ar<int, 3>>, greater<ar<int, 3>>> pq;
  for (auto i : hives) {
    pq.push({0, i.first, i.second});
  }
  while (!pq.empty()) {
    int d = pq.top()[0], x = pq.top()[1], y = pq.top()[2]; pq.pop();
    if (disthives[x][y] < d) {
      continue;
    }
    for (int k = 0; k < 4; ++k) {
      int nx = x + dx[k], ny = y + dy[k];
      if (checkhives(nx, ny)) {
        pq.push({d + 1, nx, ny});
        disthives[nx][ny] = d + 1;
      }
    }
  }

  // for (int i = 0; i < n; ++i) {
  //   for (int j = 0; j < n; ++j) {
  //     cout << disthives[i][j] << ' ';
  //   }
  //   cout << '\n';
  // }

  // cerr << "HELLO\n";

  int l = 0, r = mxN * mxN;
  while (l <= r) {
    int m = (l + r) >> 1;
    dist = vector<vector<int>>(mxN, vector<int>(mxN, (int) 1e11));
    dist[mecho.first][mecho.second] = m * K;
    bfs(m * K);
    if (dist[home.first][home.second] < 1e11) {
      l = m + 1;
    } else {
      r = m - 1;
    }
  }
  cout << l - 1 << '\n';
}

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 32 ms 15512 KB Output is correct
2 Correct 32 ms 15524 KB Output is correct
3 Correct 28 ms 15492 KB Output is correct
4 Correct 27 ms 15508 KB Output is correct
5 Correct 32 ms 15512 KB Output is correct
6 Correct 31 ms 15540 KB Output is correct
7 Correct 462 ms 16696 KB Output is correct
8 Correct 29 ms 15500 KB Output is correct
9 Correct 29 ms 15496 KB Output is correct
10 Correct 29 ms 15532 KB Output is correct
11 Correct 29 ms 15564 KB Output is correct
12 Incorrect 31 ms 15528 KB Output isn't correct
13 Incorrect 29 ms 15540 KB Output isn't correct
14 Correct 30 ms 15512 KB Output is correct
15 Correct 30 ms 15504 KB Output is correct
16 Correct 30 ms 15548 KB Output is correct
17 Correct 29 ms 15508 KB Output is correct
18 Correct 31 ms 15500 KB Output is correct
19 Correct 31 ms 15504 KB Output is correct
20 Correct 31 ms 15528 KB Output is correct
21 Correct 33 ms 15512 KB Output is correct
22 Correct 32 ms 15500 KB Output is correct
23 Correct 31 ms 15516 KB Output is correct
24 Correct 34 ms 15520 KB Output is correct
25 Correct 31 ms 15504 KB Output is correct
26 Correct 29 ms 15508 KB Output is correct
27 Correct 32 ms 15500 KB Output is correct
28 Correct 33 ms 15544 KB Output is correct
29 Correct 28 ms 15544 KB Output is correct
30 Correct 31 ms 15508 KB Output is correct
31 Correct 26 ms 15488 KB Output is correct
32 Correct 31 ms 15528 KB Output is correct
33 Correct 33 ms 15688 KB Output is correct
34 Correct 25 ms 15648 KB Output is correct
35 Correct 117 ms 15676 KB Output is correct
36 Correct 36 ms 15764 KB Output is correct
37 Correct 30 ms 15664 KB Output is correct
38 Correct 165 ms 15728 KB Output is correct
39 Correct 25 ms 15696 KB Output is correct
40 Correct 44 ms 15776 KB Output is correct
41 Correct 185 ms 15760 KB Output is correct
42 Correct 29 ms 15796 KB Output is correct
43 Correct 38 ms 15844 KB Output is correct
44 Correct 247 ms 16020 KB Output is correct
45 Correct 33 ms 15880 KB Output is correct
46 Correct 45 ms 15900 KB Output is correct
47 Correct 281 ms 15920 KB Output is correct
48 Correct 39 ms 15976 KB Output is correct
49 Correct 33 ms 15948 KB Output is correct
50 Correct 341 ms 16100 KB Output is correct
51 Correct 40 ms 16116 KB Output is correct
52 Correct 39 ms 16048 KB Output is correct
53 Correct 406 ms 16152 KB Output is correct
54 Correct 41 ms 16200 KB Output is correct
55 Correct 35 ms 16156 KB Output is correct
56 Correct 456 ms 16196 KB Output is correct
57 Correct 47 ms 16288 KB Output is correct
58 Correct 46 ms 16196 KB Output is correct
59 Correct 528 ms 16288 KB Output is correct
60 Correct 51 ms 16396 KB Output is correct
61 Correct 53 ms 16332 KB Output is correct
62 Correct 607 ms 16372 KB Output is correct
63 Correct 321 ms 16588 KB Output is correct
64 Correct 597 ms 16392 KB Output is correct
65 Correct 462 ms 16372 KB Output is correct
66 Correct 366 ms 16412 KB Output is correct
67 Correct 366 ms 16376 KB Output is correct
68 Correct 159 ms 16456 KB Output is correct
69 Correct 153 ms 16472 KB Output is correct
70 Correct 140 ms 16508 KB Output is correct
71 Correct 145 ms 16472 KB Output is correct
72 Incorrect 119 ms 16444 KB Output isn't correct
73 Incorrect 368 ms 17316 KB Output isn't correct
74 Correct 279 ms 17232 KB Output is correct
75 Correct 348 ms 17176 KB Output is correct
76 Correct 311 ms 17204 KB Output is correct
77 Correct 296 ms 17188 KB Output is correct
78 Correct 369 ms 17148 KB Output is correct
79 Correct 246 ms 17088 KB Output is correct
80 Correct 293 ms 17332 KB Output is correct
81 Correct 317 ms 17180 KB Output is correct
82 Correct 293 ms 17116 KB Output is correct
83 Correct 418 ms 17036 KB Output is correct
84 Correct 367 ms 16996 KB Output is correct
85 Correct 397 ms 17000 KB Output is correct
86 Correct 382 ms 16988 KB Output is correct
87 Correct 392 ms 17072 KB Output is correct
88 Correct 396 ms 16844 KB Output is correct
89 Correct 415 ms 16908 KB Output is correct
90 Correct 434 ms 16844 KB Output is correct
91 Correct 419 ms 16896 KB Output is correct
92 Correct 479 ms 16908 KB Output is correct