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Submission #1098001

# Submission time Handle Problem Language Result Execution time Memory
1098001 2024-10-08T19:28:45 Z vjudge1 Mecho (IOI09_mecho) C++17
84 / 100
 176 ms 6924 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 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 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 90 ms 6904 KB Output is correct
8 Correct 0 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 344 KB Output isn't correct
13 Incorrect 0 ms 348 KB Output isn't correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 460 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 1 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 0 ms 344 KB Output is correct
22 Correct 1 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 1 ms 348 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 1 ms 348 KB Output is correct
33 Correct 5 ms 1692 KB Output is correct
34 Correct 6 ms 1688 KB Output is correct
35 Correct 23 ms 1732 KB Output is correct
36 Correct 7 ms 2108 KB Output is correct
37 Correct 7 ms 2144 KB Output is correct
38 Correct 35 ms 2084 KB Output is correct
39 Correct 12 ms 2496 KB Output is correct
40 Correct 8 ms 2488 KB Output is correct
41 Correct 37 ms 2496 KB Output is correct
42 Correct 15 ms 2948 KB Output is correct
43 Correct 15 ms 3220 KB Output is correct
44 Correct 57 ms 2976 KB Output is correct
45 Correct 15 ms 3516 KB Output is correct
46 Correct 12 ms 3480 KB Output is correct
47 Correct 59 ms 3472 KB Output is correct
48 Correct 14 ms 4100 KB Output is correct
49 Correct 25 ms 4104 KB Output is correct
50 Correct 77 ms 4064 KB Output is correct
51 Correct 18 ms 4684 KB Output is correct
52 Correct 19 ms 4684 KB Output is correct
53 Correct 96 ms 4664 KB Output is correct
54 Correct 21 ms 5408 KB Output is correct
55 Correct 28 ms 5376 KB Output is correct
56 Correct 116 ms 5340 KB Output is correct
57 Correct 29 ms 6088 KB Output is correct
58 Correct 28 ms 6284 KB Output is correct
59 Correct 147 ms 6108 KB Output is correct
60 Correct 23 ms 6892 KB Output is correct
61 Correct 33 ms 6876 KB Output is correct
62 Correct 125 ms 6876 KB Output is correct
63 Correct 110 ms 6864 KB Output is correct
64 Correct 162 ms 6860 KB Output is correct
65 Correct 176 ms 6864 KB Output is correct
66 Correct 132 ms 6856 KB Output is correct
67 Correct 115 ms 6872 KB Output is correct
68 Correct 50 ms 6916 KB Output is correct
69 Correct 51 ms 6876 KB Output is correct
70 Correct 63 ms 6876 KB Output is correct
71 Correct 48 ms 6884 KB Output is correct
72 Incorrect 51 ms 6876 KB Output isn't correct
73 Incorrect 93 ms 6764 KB Output isn't correct
74 Correct 69 ms 6876 KB Output is correct
75 Correct 74 ms 6800 KB Output is correct
76 Correct 89 ms 6904 KB Output is correct
77 Correct 73 ms 6888 KB Output is correct
78 Correct 73 ms 6892 KB Output is correct
79 Correct 64 ms 6896 KB Output is correct
80 Correct 67 ms 6916 KB Output is correct
81 Correct 77 ms 6924 KB Output is correct
82 Correct 63 ms 6892 KB Output is correct
83 Correct 84 ms 6868 KB Output is correct
84 Correct 77 ms 6888 KB Output is correct
85 Correct 85 ms 6896 KB Output is correct
86 Correct 111 ms 6888 KB Output is correct
87 Correct 87 ms 6888 KB Output is correct
88 Correct 87 ms 6876 KB Output is correct
89 Correct 110 ms 6856 KB Output is correct
90 Correct 93 ms 6892 KB Output is correct
91 Correct 91 ms 6896 KB Output is correct
92 Correct 94 ms 6876 KB Output is correct