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Submission #335551

# Submission time Handle Problem Language Result Execution time Memory
335551 2020-12-13T04:23:43 Z batjargala11 Mecho (IOI09_mecho) C++14
100 / 100
 264 ms 12396 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 2 ms 1004 KB Output is correct
3 Correct 1 ms 1004 KB Output is correct
4 Correct 1 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 131 ms 11244 KB Output is correct
8 Correct 2 ms 1004 KB Output is correct
9 Correct 2 ms 1004 KB Output is correct
10 Correct 1 ms 1004 KB Output is correct
11 Correct 1 ms 1024 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 1388 KB Output is correct
15 Correct 1 ms 1004 KB Output is correct
16 Correct 1 ms 1152 KB Output is correct
17 Correct 2 ms 1132 KB Output is correct
18 Correct 2 ms 1132 KB Output is correct
19 Correct 1 ms 1132 KB Output is correct
20 Correct 2 ms 1260 KB Output is correct
21 Correct 2 ms 1132 KB Output is correct
22 Correct 2 ms 1132 KB Output is correct
23 Correct 2 ms 1132 KB Output is correct
24 Correct 2 ms 1260 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 1388 KB Output is correct
33 Correct 11 ms 2924 KB Output is correct
34 Correct 11 ms 2924 KB Output is correct
35 Correct 31 ms 4460 KB Output is correct
36 Correct 14 ms 3308 KB Output is correct
37 Correct 14 ms 3436 KB Output is correct
38 Correct 42 ms 4844 KB Output is correct
39 Correct 17 ms 3692 KB Output is correct
40 Correct 17 ms 3820 KB Output is correct
41 Correct 50 ms 5484 KB Output is correct
42 Correct 20 ms 4204 KB Output is correct
43 Correct 25 ms 4204 KB Output is correct
44 Correct 68 ms 6380 KB Output is correct
45 Correct 24 ms 4588 KB Output is correct
46 Correct 25 ms 4588 KB Output is correct
47 Correct 76 ms 6892 KB Output is correct
48 Correct 28 ms 5120 KB Output is correct
49 Correct 28 ms 5100 KB Output is correct
50 Correct 95 ms 7808 KB Output is correct
51 Correct 36 ms 5612 KB Output is correct
52 Correct 33 ms 5612 KB Output is correct
53 Correct 113 ms 8428 KB Output is correct
54 Correct 38 ms 6124 KB Output is correct
55 Correct 38 ms 6124 KB Output is correct
56 Correct 134 ms 9324 KB Output is correct
57 Correct 43 ms 6636 KB Output is correct
58 Correct 43 ms 6764 KB Output is correct
59 Correct 153 ms 10092 KB Output is correct
60 Correct 58 ms 7276 KB Output is correct
61 Correct 49 ms 7276 KB Output is correct
62 Correct 173 ms 10988 KB Output is correct
63 Correct 158 ms 10220 KB Output is correct
64 Correct 264 ms 10348 KB Output is correct
65 Correct 213 ms 10220 KB Output is correct
66 Correct 175 ms 10220 KB Output is correct
67 Correct 183 ms 10476 KB Output is correct
68 Correct 89 ms 10348 KB Output is correct
69 Correct 89 ms 10220 KB Output is correct
70 Correct 76 ms 10220 KB Output is correct
71 Correct 91 ms 10220 KB Output is correct
72 Correct 69 ms 8428 KB Output is correct
73 Correct 75 ms 12396 KB Output is correct
74 Correct 104 ms 12268 KB Output is correct
75 Correct 118 ms 12268 KB Output is correct
76 Correct 109 ms 12268 KB Output is correct
77 Correct 106 ms 12268 KB Output is correct
78 Correct 119 ms 10988 KB Output is correct
79 Correct 86 ms 10732 KB Output is correct
80 Correct 103 ms 10720 KB Output is correct
81 Correct 110 ms 10732 KB Output is correct
82 Correct 104 ms 10732 KB Output is correct
83 Correct 124 ms 10988 KB Output is correct
84 Correct 113 ms 11008 KB Output is correct
85 Correct 124 ms 10860 KB Output is correct
86 Correct 120 ms 10860 KB Output is correct
87 Correct 123 ms 10860 KB Output is correct
88 Correct 126 ms 11244 KB Output is correct
89 Correct 130 ms 10988 KB Output is correct
90 Correct 131 ms 10988 KB Output is correct
91 Correct 128 ms 11148 KB Output is correct
92 Correct 140 ms 11152 KB Output is correct