oj.uz

Submission #494915

# Submission time Handle Problem Language Result Execution time Memory
494915 2021-12-17T13:13:55 Z Christopher_ Mecho (IOI09_mecho) C++17
84 / 100
 635 ms 17152 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) 1e9)), dist(mxN, vector<int>(mxN, (int) 1e9));

bool checkhives(int x, int y) {
  return x >= 0 && x < n && y >= 0 && y < n && g[x][y] == 'G' && disthives[x][y] == (int) 1e9;
}

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) 1e9;
}

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) 1e9));
    dist[mecho.first][mecho.second] = m * K;
    bfs(m * K);
    if (dist[home.first][home.second] < 1e9) {
      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 30 ms 15512 KB Output is correct
2 Correct 29 ms 15532 KB Output is correct
3 Correct 33 ms 15532 KB Output is correct
4 Correct 31 ms 15508 KB Output is correct
5 Correct 32 ms 15492 KB Output is correct
6 Correct 29 ms 15584 KB Output is correct
7 Correct 466 ms 16592 KB Output is correct
8 Correct 32 ms 15552 KB Output is correct
9 Correct 34 ms 15496 KB Output is correct
10 Correct 30 ms 15520 KB Output is correct
11 Correct 29 ms 15516 KB Output is correct
12 Incorrect 32 ms 15504 KB Output isn't correct
13 Incorrect 30 ms 15544 KB Output isn't correct
14 Correct 30 ms 15532 KB Output is correct
15 Correct 29 ms 15500 KB Output is correct
16 Correct 29 ms 15536 KB Output is correct
17 Correct 31 ms 15516 KB Output is correct
18 Correct 30 ms 15500 KB Output is correct
19 Correct 30 ms 15532 KB Output is correct
20 Correct 31 ms 15516 KB Output is correct
21 Correct 30 ms 15516 KB Output is correct
22 Correct 31 ms 15512 KB Output is correct
23 Correct 30 ms 15516 KB Output is correct
24 Correct 30 ms 15548 KB Output is correct
25 Correct 33 ms 15508 KB Output is correct
26 Correct 31 ms 15564 KB Output is correct
27 Correct 30 ms 15560 KB Output is correct
28 Correct 34 ms 15500 KB Output is correct
29 Correct 33 ms 15504 KB Output is correct
30 Correct 39 ms 15520 KB Output is correct
31 Correct 25 ms 15516 KB Output is correct
32 Correct 31 ms 15500 KB Output is correct
33 Correct 36 ms 15668 KB Output is correct
34 Correct 27 ms 15612 KB Output is correct
35 Correct 122 ms 15660 KB Output is correct
36 Correct 37 ms 15752 KB Output is correct
37 Correct 29 ms 15680 KB Output is correct
38 Correct 153 ms 15736 KB Output is correct
39 Correct 26 ms 15692 KB Output is correct
40 Correct 38 ms 15776 KB Output is correct
41 Correct 197 ms 15776 KB Output is correct
42 Correct 27 ms 15776 KB Output is correct
43 Correct 37 ms 15844 KB Output is correct
44 Correct 230 ms 15824 KB Output is correct
45 Correct 35 ms 15900 KB Output is correct
46 Correct 47 ms 15848 KB Output is correct
47 Correct 266 ms 15876 KB Output is correct
48 Correct 37 ms 15964 KB Output is correct
49 Correct 32 ms 15884 KB Output is correct
50 Correct 325 ms 16188 KB Output is correct
51 Correct 41 ms 16068 KB Output is correct
52 Correct 35 ms 15944 KB Output is correct
53 Correct 414 ms 16032 KB Output is correct
54 Correct 41 ms 16084 KB Output is correct
55 Correct 37 ms 16024 KB Output is correct
56 Correct 461 ms 16144 KB Output is correct
57 Correct 49 ms 16280 KB Output is correct
58 Correct 45 ms 16160 KB Output is correct
59 Correct 539 ms 16240 KB Output is correct
60 Correct 50 ms 16248 KB Output is correct
61 Correct 54 ms 16240 KB Output is correct
62 Correct 626 ms 16256 KB Output is correct
63 Correct 357 ms 16324 KB Output is correct
64 Correct 635 ms 16256 KB Output is correct
65 Correct 484 ms 16240 KB Output is correct
66 Correct 381 ms 16300 KB Output is correct
67 Correct 372 ms 16256 KB Output is correct
68 Correct 160 ms 16352 KB Output is correct
69 Correct 158 ms 16428 KB Output is correct
70 Correct 129 ms 16356 KB Output is correct
71 Correct 143 ms 16352 KB Output is correct
72 Incorrect 126 ms 16400 KB Output isn't correct
73 Incorrect 367 ms 17104 KB Output isn't correct
74 Correct 287 ms 17096 KB Output is correct
75 Correct 373 ms 17076 KB Output is correct
76 Correct 314 ms 17152 KB Output is correct
77 Correct 300 ms 17112 KB Output is correct
78 Correct 375 ms 17020 KB Output is correct
79 Correct 263 ms 16984 KB Output is correct
80 Correct 318 ms 16988 KB Output is correct
81 Correct 329 ms 17004 KB Output is correct
82 Correct 286 ms 16968 KB Output is correct
83 Correct 433 ms 16948 KB Output is correct
84 Correct 385 ms 16852 KB Output is correct
85 Correct 393 ms 16860 KB Output is correct
86 Correct 395 ms 16856 KB Output is correct
87 Correct 404 ms 16912 KB Output is correct
88 Correct 432 ms 16812 KB Output is correct
89 Correct 432 ms 16752 KB Output is correct
90 Correct 463 ms 16828 KB Output is correct
91 Correct 456 ms 16792 KB Output is correct
92 Correct 482 ms 16788 KB Output is correct