oj.uz

Submission #494914

# Submission time Handle Problem Language Result Execution time Memory
494914 2021-12-17T13:07:34 Z Christopher_ Mecho (IOI09_mecho) C++17
64 / 100
 626 ms 17496 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) 1e7)), dist(mxN, vector<int>(mxN, (int) 1e7));

bool checkhives(int x, int y) {
  return x >= 0 && x < n && y >= 0 && y < n && g[x][y] == 'G' && disthives[x][y] == (int) 1e7;
}

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) 1e7;
}

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) 1e7));
    dist[mecho.first][mecho.second] = m * K;
    bfs(m * K);
    if (dist[home.first][home.second] < 1e7) {
      l = m + 1;
    } else {
      r = m - 1;
    }
  }
  cout << l - 1 << '\n';
}

Subtask #1
64.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 15672 KB Output is correct
2 Correct 30 ms 15496 KB Output is correct
3 Correct 32 ms 15508 KB Output is correct
4 Correct 31 ms 15564 KB Output is correct
5 Correct 33 ms 15496 KB Output is correct
6 Correct 32 ms 15504 KB Output is correct
7 Correct 451 ms 16864 KB Output is correct
8 Correct 33 ms 15524 KB Output is correct
9 Correct 30 ms 15496 KB Output is correct
10 Correct 32 ms 15548 KB Output is correct
11 Correct 33 ms 15692 KB Output is correct
12 Incorrect 31 ms 15516 KB Output isn't correct
13 Incorrect 32 ms 15548 KB Output isn't correct
14 Correct 32 ms 15520 KB Output is correct
15 Correct 29 ms 15516 KB Output is correct
16 Correct 31 ms 15556 KB Output is correct
17 Correct 30 ms 15512 KB Output is correct
18 Correct 29 ms 15512 KB Output is correct
19 Correct 30 ms 15492 KB Output is correct
20 Correct 29 ms 15476 KB Output is correct
21 Correct 30 ms 15516 KB Output is correct
22 Correct 31 ms 15500 KB Output is correct
23 Correct 29 ms 15540 KB Output is correct
24 Correct 28 ms 15520 KB Output is correct
25 Correct 30 ms 15524 KB Output is correct
26 Correct 30 ms 15500 KB Output is correct
27 Correct 30 ms 15564 KB Output is correct
28 Correct 30 ms 15532 KB Output is correct
29 Correct 30 ms 15532 KB Output is correct
30 Correct 31 ms 15552 KB Output is correct
31 Correct 25 ms 15460 KB Output is correct
32 Correct 30 ms 15516 KB Output is correct
33 Correct 33 ms 15736 KB Output is correct
34 Correct 26 ms 15712 KB Output is correct
35 Correct 121 ms 15816 KB Output is correct
36 Correct 37 ms 15804 KB Output is correct
37 Correct 29 ms 15756 KB Output is correct
38 Correct 148 ms 15800 KB Output is correct
39 Correct 25 ms 15820 KB Output is correct
40 Incorrect 48 ms 15916 KB Output isn't correct
41 Correct 183 ms 15900 KB Output is correct
42 Correct 29 ms 15968 KB Output is correct
43 Incorrect 79 ms 16008 KB Output isn't correct
44 Correct 233 ms 15976 KB Output is correct
45 Correct 30 ms 16028 KB Output is correct
46 Incorrect 103 ms 16032 KB Output isn't correct
47 Correct 278 ms 16084 KB Output is correct
48 Correct 38 ms 16172 KB Output is correct
49 Incorrect 131 ms 16156 KB Output isn't correct
50 Correct 333 ms 16352 KB Output is correct
51 Correct 40 ms 16296 KB Output is correct
52 Incorrect 150 ms 16212 KB Output isn't correct
53 Correct 396 ms 16232 KB Output is correct
54 Correct 42 ms 16324 KB Output is correct
55 Incorrect 198 ms 16228 KB Output isn't correct
56 Correct 471 ms 16332 KB Output is correct
57 Correct 50 ms 16420 KB Output is correct
58 Incorrect 237 ms 16360 KB Output isn't correct
59 Correct 549 ms 16472 KB Output is correct
60 Correct 53 ms 16456 KB Output is correct
61 Incorrect 268 ms 16428 KB Output isn't correct
62 Correct 626 ms 16544 KB Output is correct
63 Correct 341 ms 16508 KB Output is correct
64 Correct 617 ms 16596 KB Output is correct
65 Correct 483 ms 16748 KB Output is correct
66 Correct 375 ms 16456 KB Output is correct
67 Correct 374 ms 16608 KB Output is correct
68 Correct 158 ms 16564 KB Output is correct
69 Correct 153 ms 16588 KB Output is correct
70 Correct 132 ms 16556 KB Output is correct
71 Correct 154 ms 16648 KB Output is correct
72 Incorrect 128 ms 16552 KB Output isn't correct
73 Incorrect 364 ms 17340 KB Output isn't correct
74 Correct 298 ms 17408 KB Output is correct
75 Correct 353 ms 17276 KB Output is correct
76 Correct 322 ms 17496 KB Output is correct
77 Correct 304 ms 17252 KB Output is correct
78 Correct 392 ms 17220 KB Output is correct
79 Correct 263 ms 17156 KB Output is correct
80 Correct 303 ms 17176 KB Output is correct
81 Correct 327 ms 17184 KB Output is correct
82 Correct 297 ms 17176 KB Output is correct
83 Correct 431 ms 17160 KB Output is correct
84 Correct 360 ms 17068 KB Output is correct
85 Correct 418 ms 17148 KB Output is correct
86 Correct 406 ms 17052 KB Output is correct
87 Correct 414 ms 17120 KB Output is correct
88 Correct 437 ms 16956 KB Output is correct
89 Correct 453 ms 17016 KB Output is correct
90 Correct 449 ms 16916 KB Output is correct
91 Correct 437 ms 16920 KB Output is correct
92 Correct 488 ms 16928 KB Output is correct