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Submission #335554

# Submission time Handle Problem Language Result Execution time Memory
335554 2020-12-13T04:35:20 Z enerelt14 Mecho (IOI09_mecho) C++14
100 / 100
 264 ms 11628 KB 
#include <bits/stdc++.h>
#define x first
#define y second
#define mp make_pair

using namespace std;
int n, s;
pair<int, int> start, home;
int T, H;
int occ_time[805][805];
bool vis[805][805];
bool tree[805][805];
pair<int, int > Q[1000000];
int movex[] = {0, 0, -1, 1};
int movey[] = {-1, 1, 0, 0};
bool check(pair<int, int> v){
  if(v.x >= 0 && v.x < n && v.y >= 0 && v.y < n && !tree[v.x][v.y] && !vis[v.x][v.y]) return 1;
  return 0;
}
void init_bfs(){
    
    pair<int, int> u, v;
    while(H < T){
      u = Q[H++];
      if(u == home) continue;
      //cout << u.x << ' ' << u.y << ' ' << occ_time[u.x][u.y] << endl;
      for(int i = 0; i < 4; i++){
          v = mp(u.x + movex[i], u.y + movey[i]);
          if(!check(v)) continue;
          occ_time[v.x][v.y] = occ_time[u.x][u.y] + s;
          vis[v.x][v.y] = 1;
          Q[T++] = v;
      }
    }
}
int dist[805][805];
bool solve(int st){
  memset(vis, 0, sizeof(vis));
  H = T = 0;
  pair<int, int> u, v;
 
  dist[start.x][start.y] = st;
  Q[T++] = start;
  
  while(H < T){

    u = Q[H++];
    if(u == home) return 1;
    
    if(dist[u.x][u.y] >= occ_time[u.x][u.y]) continue;

    for(int i = 0; i < 4; i++){
          v = mp(u.x + movex[i], u.y + movey[i]);
          if(!check(v)) continue;
          dist[v.x][v.y] = dist[u.x][u.y] + 1;
          vis[v.x][v.y] = 1;
          Q[T++] = v;
    }
  }
  return 0;
}
int search(){
  int l = 0, r = 800 * 800 + 1;
  int res = -1;
  while(l <= r){
    int mid = (l + r) / 2;
    //cout << mid << endl;
    if(solve(mid * s)){
        l = mid + 1;
        res = max(res, mid);
    }
    else r = mid - 1;
  }

  return res;
}
int main(){
  cin >> n >> s;
  for(int i = 0; i < n; i++)
    for(int j = 0; j < n; j++){
      char ch;
      cin >> ch;
      if(ch == 'M') {
        start = mp(i, j);
      }
      if(ch == 'D') {
         home = mp(i, j);
      }
      if(ch == 'H') {
          Q[T++] = make_pair(i, j);
          vis[i][j] = 1;
          occ_time[i][j] = 0;
      } 
      if(ch == 'T') {
        tree[i][j] = 1;
      }
    }
    init_bfs();
    cout << search() << endl;
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:79:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   79 |   for(int i = 0; i < n; i++)
      |   ^~~
mecho.cpp:98:5: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   98 |     init_bfs();
      |     ^~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 1004 KB Output is correct
2 Correct 1 ms 1004 KB Output is correct
3 Correct 1 ms 1004 KB Output is correct
4 Correct 2 ms 1004 KB Output is correct
5 Correct 1 ms 1024 KB Output is correct
6 Correct 1 ms 1004 KB Output is correct
7 Correct 132 ms 10732 KB Output is correct
8 Correct 1 ms 1004 KB Output is correct
9 Correct 1 ms 1004 KB Output is correct
10 Correct 1 ms 1004 KB Output is correct
11 Correct 1 ms 1004 KB Output is correct
12 Correct 2 ms 1260 KB Output is correct
13 Correct 2 ms 1260 KB Output is correct
14 Correct 2 ms 1408 KB Output is correct
15 Correct 1 ms 1004 KB Output is correct
16 Correct 1 ms 1144 KB Output is correct
17 Correct 1 ms 1152 KB Output is correct
18 Correct 1 ms 1132 KB Output is correct
19 Correct 1 ms 1132 KB Output is correct
20 Correct 1 ms 1132 KB Output is correct
21 Correct 2 ms 1132 KB Output is correct
22 Correct 2 ms 1132 KB Output is correct
23 Correct 1 ms 1132 KB Output is correct
24 Correct 2 ms 1280 KB Output is correct
25 Correct 2 ms 1260 KB Output is correct
26 Correct 2 ms 1260 KB Output is correct
27 Correct 2 ms 1260 KB Output is correct
28 Correct 2 ms 1260 KB Output is correct
29 Correct 2 ms 1260 KB Output is correct
30 Correct 2 ms 1260 KB Output is correct
31 Correct 2 ms 1260 KB Output is correct
32 Correct 2 ms 1260 KB Output is correct
33 Correct 12 ms 2796 KB Output is correct
34 Correct 11 ms 2924 KB Output is correct
35 Correct 30 ms 4204 KB Output is correct
36 Correct 13 ms 3180 KB Output is correct
37 Correct 14 ms 3180 KB Output is correct
38 Correct 42 ms 4736 KB Output is correct
39 Correct 17 ms 3564 KB Output is correct
40 Correct 17 ms 3564 KB Output is correct
41 Correct 50 ms 5356 KB Output is correct
42 Correct 20 ms 3948 KB Output is correct
43 Correct 20 ms 3948 KB Output is correct
44 Correct 62 ms 5996 KB Output is correct
45 Correct 24 ms 4332 KB Output is correct
46 Correct 26 ms 4332 KB Output is correct
47 Correct 78 ms 6636 KB Output is correct
48 Correct 28 ms 4716 KB Output is correct
49 Correct 28 ms 4716 KB Output is correct
50 Correct 96 ms 7404 KB Output is correct
51 Correct 32 ms 5228 KB Output is correct
52 Correct 34 ms 5224 KB Output is correct
53 Correct 111 ms 8044 KB Output is correct
54 Correct 37 ms 5632 KB Output is correct
55 Correct 39 ms 5612 KB Output is correct
56 Correct 132 ms 8812 KB Output is correct
57 Correct 47 ms 6124 KB Output is correct
58 Correct 43 ms 6124 KB Output is correct
59 Correct 153 ms 9580 KB Output is correct
60 Correct 48 ms 6636 KB Output is correct
61 Correct 49 ms 6636 KB Output is correct
62 Correct 171 ms 10476 KB Output is correct
63 Correct 157 ms 9580 KB Output is correct
64 Correct 264 ms 9580 KB Output is correct
65 Correct 210 ms 9580 KB Output is correct
66 Correct 177 ms 9580 KB Output is correct
67 Correct 171 ms 9708 KB Output is correct
68 Correct 91 ms 9580 KB Output is correct
69 Correct 89 ms 9580 KB Output is correct
70 Correct 77 ms 9708 KB Output is correct
71 Correct 84 ms 9580 KB Output is correct
72 Correct 68 ms 7788 KB Output is correct
73 Correct 74 ms 11628 KB Output is correct
74 Correct 100 ms 11628 KB Output is correct
75 Correct 116 ms 11628 KB Output is correct
76 Correct 105 ms 11628 KB Output is correct
77 Correct 111 ms 11628 KB Output is correct
78 Correct 119 ms 10300 KB Output is correct
79 Correct 86 ms 9964 KB Output is correct
80 Correct 104 ms 10220 KB Output is correct
81 Correct 112 ms 10240 KB Output is correct
82 Correct 99 ms 10092 KB Output is correct
83 Correct 123 ms 10348 KB Output is correct
84 Correct 115 ms 10220 KB Output is correct
85 Correct 123 ms 10348 KB Output is correct
86 Correct 123 ms 10316 KB Output is correct
87 Correct 121 ms 10348 KB Output is correct
88 Correct 125 ms 10604 KB Output is correct
89 Correct 127 ms 10348 KB Output is correct
90 Correct 129 ms 10348 KB Output is correct
91 Correct 128 ms 10476 KB Output is correct
92 Correct 137 ms 10476 KB Output is correct