oj.uz

Submission #1098025

# Submission time Handle Problem Language Result Execution time Memory
1098025 2024-10-08T20:00:06 Z sexo69696969 Mecho (IOI09_mecho) C++17
84 / 100
 186 ms 6360 KB 
#include <bits/stdc++.h>
using namespace std;

#ifdef local
  #include "debug.hpp"
  #define pr(...) debug(#__VA_ARGS__, __VA_ARGS__)
  #define prs(...) debug_nameless(__VA_ARGS__)
#else
  #define pr(...) 69
  #define prs(...) 69
#endif

#define endl '\n'

const int inf = 1e9;
const long long binf = 1e18;

void solve(int tc){
  int n, s;
  cin >> n >> s;
  int st = -1, ed = -1;
  vector <int> bees;
  auto get_hash = [&](int i, int j){
    return n*i + j;
  };
  vector <string> grid(n);
  for(int i = 0; i < n; i++){
    cin >> grid[i];
    for(int j = 0; j < n; j++){
      int hash = get_hash(i, j);
      if(grid[i][j] == 'M') st = hash;
      if(grid[i][j] == 'D') ed = hash;
      if(grid[i][j] == 'H') bees.push_back(hash);
    }
  }
  assert(bees.size() > 0 && st != -1 && ed != -1);
  vector <vector<int>> bdist(n, vector<int>(n, inf));
  queue <int> queue;
  for(int b : bees){
    queue.push(b);
    bdist[b/n][b%n] = 0;
  }
  auto inside = [&](int l, int c){
    return (min(l, c) >= 0 && max(l, c) < n && (grid[l][c] == 'G' || grid[l][c] == 'D'));
  };
  while(queue.size() > 0){
    int node = queue.front();
    queue.pop();
    int l = node/n, c = node%n;
    for(int i = -1; i <= 1; i++){
      for(int j = -1; j <= 1; j++){
        if(i*j != 0) continue;
        if(inside(l+i, c+j) && grid[l+i][c+j] != 'D' && bdist[l+i][c+j] > s + bdist[l][c]){
          queue.push(get_hash(l+i, c+j));
          bdist[l+i][c+j] = s + bdist[l][c];
        }
      }
    }
  }
  auto check = [&](int t){
    while(queue.size()) queue.pop();
    vector <vector<int>> dist(n, vector<int>(n, inf));
    dist[st/n][st%n] = s*t;
    queue.push(st);
    while(queue.size() > 0){
      int node = queue.front();
      queue.pop();
      int l = node/n, c = node%n;
      for(int i = -1; i <= 1; i++){
        for(int j = -1; j <= 1; j++){
          if(i*j != 0) continue;
          if(inside(l+i, c+j) && bdist[l+i][c+j] > 1 + dist[l][c] && 1+dist[l][c] < dist[l+i][c+j]){
            queue.push(get_hash(l+i, c+j));
            dist[l+i][c+j] = 1 + dist[l][c];
          }
        }
      }
    }
    int l = ed/n, c = ed%n;
    for(int i = -1; i <= 1; i++){
      for(int j = -1; j <= 1; j++){
        if(i*j != 0) continue;
        if(inside(l+i, c+j) && dist[l+i][c+j] < bdist[l+i][c+j]){
          return true;
        }
      }
    }
    return false;
  };
  int l = 0, r = 1e6;
  int ans = -1;
  while(l <= r){
    int mid = (l + r)/2;
    if(check(mid)){
      l = mid+1;
      ans = mid;
    }else{
      r = mid-1;
    }
  }
  cout << ans << endl;
}  

signed main(){
  ios_base::sync_with_stdio(0); cin.tie(0);

  int tt = 1;
  while(tt--){
    prs(string(50, '-'));
    solve(tt);
    prs(string(50, '-'));
  }

  return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:10:20: warning: statement has no effect [-Wunused-value]
   10 |   #define prs(...) 69
      |                    ^~
mecho.cpp:109:5: note: in expansion of macro 'prs'
  109 |     prs(string(50, '-'));
      |     ^~~
mecho.cpp:10:20: warning: statement has no effect [-Wunused-value]
   10 |   #define prs(...) 69
      |                    ^~
mecho.cpp:111:5: note: in expansion of macro 'prs'
  111 |     prs(string(50, '-'));
      |     ^~~

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 106 ms 6252 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Incorrect 1 ms 348 KB Output isn't correct
13 Incorrect 1 ms 348 KB Output isn't correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 1 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 0 ms 344 KB Output is correct
28 Correct 1 ms 348 KB Output is correct
29 Correct 0 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 0 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 6 ms 1624 KB Output is correct
34 Correct 6 ms 1560 KB Output is correct
35 Correct 25 ms 1576 KB Output is correct
36 Correct 6 ms 1924 KB Output is correct
37 Correct 10 ms 1884 KB Output is correct
38 Correct 28 ms 1880 KB Output is correct
39 Correct 8 ms 2352 KB Output is correct
40 Correct 9 ms 2352 KB Output is correct
41 Correct 37 ms 2368 KB Output is correct
42 Correct 11 ms 2724 KB Output is correct
43 Correct 11 ms 2772 KB Output is correct
44 Correct 56 ms 2720 KB Output is correct
45 Correct 11 ms 3244 KB Output is correct
46 Correct 13 ms 3212 KB Output is correct
47 Correct 66 ms 3172 KB Output is correct
48 Correct 15 ms 3724 KB Output is correct
49 Correct 14 ms 3780 KB Output is correct
50 Correct 73 ms 3736 KB Output is correct
51 Correct 17 ms 4324 KB Output is correct
52 Correct 28 ms 4308 KB Output is correct
53 Correct 121 ms 4280 KB Output is correct
54 Correct 20 ms 4920 KB Output is correct
55 Correct 24 ms 4924 KB Output is correct
56 Correct 99 ms 4864 KB Output is correct
57 Correct 24 ms 5548 KB Output is correct
58 Correct 23 ms 5568 KB Output is correct
59 Correct 116 ms 5556 KB Output is correct
60 Correct 39 ms 6268 KB Output is correct
61 Correct 28 ms 6264 KB Output is correct
62 Correct 139 ms 6224 KB Output is correct
63 Correct 114 ms 6220 KB Output is correct
64 Correct 186 ms 6216 KB Output is correct
65 Correct 168 ms 6228 KB Output is correct
66 Correct 133 ms 6248 KB Output is correct
67 Correct 107 ms 6216 KB Output is correct
68 Correct 51 ms 6308 KB Output is correct
69 Correct 56 ms 6268 KB Output is correct
70 Correct 54 ms 6316 KB Output is correct
71 Correct 42 ms 6260 KB Output is correct
72 Incorrect 46 ms 6280 KB Output isn't correct
73 Incorrect 84 ms 6236 KB Output isn't correct
74 Correct 69 ms 6240 KB Output is correct
75 Correct 77 ms 6184 KB Output is correct
76 Correct 72 ms 6284 KB Output is correct
77 Correct 76 ms 6284 KB Output is correct
78 Correct 75 ms 6300 KB Output is correct
79 Correct 64 ms 6256 KB Output is correct
80 Correct 69 ms 6264 KB Output is correct
81 Correct 104 ms 6228 KB Output is correct
82 Correct 62 ms 6324 KB Output is correct
83 Correct 88 ms 6268 KB Output is correct
84 Correct 80 ms 6260 KB Output is correct
85 Correct 81 ms 6288 KB Output is correct
86 Correct 83 ms 6272 KB Output is correct
87 Correct 79 ms 6268 KB Output is correct
88 Correct 87 ms 6248 KB Output is correct
89 Correct 97 ms 6272 KB Output is correct
90 Correct 97 ms 6360 KB Output is correct
91 Correct 94 ms 6292 KB Output is correct
92 Correct 114 ms 6256 KB Output is correct