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Submission #585412

# Submission time Handle Problem Language Result Execution time Memory
585412 2022-06-28T20:06:33 Z Andrei_Calota Mecho (IOI09_mecho) C++14
100 / 100
 191 ms 6256 KB 
#include <bits/stdc++.h>

using namespace std;
const int NMAX = 8e2;
const int VISUAL = 4;

int dl[] = { -1, 0, 1,  0 };
int dc[] = {  0, 1, 0, -1 };
int n, step; int bee_dist[2 + NMAX][2 + NMAX];
char forest[2 + NMAX][2 + NMAX]; int dist[2 + NMAX][2 + NMAX];
pair<int, int> honey, house;

vector<pair<int, int>> bees;
void bee_spread () {
   queue<pair<int, int>> q;
   for ( auto pos : bees ) {
      q.push ( pos );
      bee_dist[pos.first][pos.second] = 1;
   }
   while ( !q.empty () ) {
      pair<int, int> start = q.front (); q.pop ();
      int line = start.first, column = start.second;
      for ( int dir = 0; dir < VISUAL; dir ++ ) {
         int new_line = line + dl[dir];
         int new_col = column + dc[dir];
         if ( forest[new_line][new_col] != 'T' && bee_dist[new_line][new_col] == 0 ) {
           if ( forest[new_line][new_col] != 'D' ) {
             q.push ( {new_line, new_col} );
             bee_dist[new_line][new_col] = bee_dist[line][column] + 1;
           }
         }
      }
   }
}
bool validation ( int time, pair<int, int> start ) {
   if ( time >= bee_dist[start.first][start.second] - 1 )
     return false;
   queue<pair<int, int>> q; q.push ( start );
   dist[start.first][start.second] = 1;
   while ( !q.empty () ) {
      start = q.front (); q.pop ();
      int line = start.first, column = start.second;
      for ( int dir = 0; dir < VISUAL; dir ++ ) {
         int new_line = line + dl[dir];
         int new_col = column + dc[dir];

         if ( new_line == house.first && new_col == house.second )
           return true;

         if ( (forest[new_line][new_col] == 'D' || forest[new_line][new_col] == 'G') && dist[new_line][new_col] == 0 ) {
           dist[new_line][new_col] = dist[line][column] + 1;
           int need = ( dist[new_line][new_col] - 1 ) / step;
           if ( need + time < bee_dist[new_line][new_col] - 1 )
             q.push ( {new_line, new_col} );
         }
      }
   }
   return false;
}

void reset_dist () {
   for ( int i = 1; i <= n; i ++ )
      for ( int j = 1; j <= n; j ++ )
         dist[i][j] = 0;
}
void solve () {
   int left = 0, right = 2 * n * n; int answer = -1;
   while ( left <= right ) {
      int time = left + (right - left) / 2;
      int status = validation ( time, honey );
      if ( status == true ) {
        answer = time;
        left = time + 1;
      }
      else
        right = time - 1;
      reset_dist ();
   }
   cout << answer;
}
int main()
{
   cin >> n >> step; cin.get ();
   for ( int line = 1; line <= n; line ++ ) {
      for ( int column = 1; column <= n; column ++ ) {
         forest[line][column] = cin.get ();
         if ( forest[line][column] == 'M' )
           honey = {line, column};
         else if ( forest[line][column] == 'D' )
           house = {line, column};
         else if ( forest[line][column] == 'H' )
           bees.push_back ( {line, column} );
      }
      cin.get ();
   }
   for ( int indx = 0; indx < n + 2; indx ++ ) {
      forest[indx][0] = forest[indx][n + 1] = 'T';
      forest[0][indx] = forest[n + 1][indx] = 'T';
   }
   bee_spread ();
   solve ();
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 83 ms 6060 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 0 ms 340 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 596 KB Output is correct
22 Correct 1 ms 596 KB Output is correct
23 Correct 1 ms 596 KB Output is correct
24 Correct 1 ms 596 KB Output is correct
25 Correct 1 ms 724 KB Output is correct
26 Correct 1 ms 724 KB Output is correct
27 Correct 1 ms 724 KB Output is correct
28 Correct 1 ms 724 KB Output is correct
29 Correct 1 ms 724 KB Output is correct
30 Correct 1 ms 724 KB Output is correct
31 Correct 1 ms 852 KB Output is correct
32 Correct 1 ms 852 KB Output is correct
33 Correct 8 ms 2692 KB Output is correct
34 Correct 8 ms 2740 KB Output is correct
35 Correct 21 ms 2772 KB Output is correct
36 Correct 10 ms 3028 KB Output is correct
37 Correct 10 ms 3028 KB Output is correct
38 Correct 27 ms 3028 KB Output is correct
39 Correct 12 ms 3412 KB Output is correct
40 Correct 12 ms 3496 KB Output is correct
41 Correct 34 ms 3476 KB Output is correct
42 Correct 14 ms 3796 KB Output is correct
43 Correct 15 ms 3796 KB Output is correct
44 Correct 41 ms 3836 KB Output is correct
45 Correct 19 ms 4264 KB Output is correct
46 Correct 17 ms 4172 KB Output is correct
47 Correct 59 ms 4192 KB Output is correct
48 Correct 22 ms 4428 KB Output is correct
49 Correct 20 ms 4476 KB Output is correct
50 Correct 62 ms 4544 KB Output is correct
51 Correct 24 ms 4852 KB Output is correct
52 Correct 23 ms 4864 KB Output is correct
53 Correct 69 ms 4844 KB Output is correct
54 Correct 30 ms 5144 KB Output is correct
55 Correct 28 ms 5232 KB Output is correct
56 Correct 90 ms 5204 KB Output is correct
57 Correct 32 ms 5588 KB Output is correct
58 Correct 34 ms 5588 KB Output is correct
59 Correct 94 ms 5604 KB Output is correct
60 Correct 35 ms 5964 KB Output is correct
61 Correct 34 ms 5896 KB Output is correct
62 Correct 124 ms 5952 KB Output is correct
63 Correct 110 ms 5876 KB Output is correct
64 Correct 191 ms 5852 KB Output is correct
65 Correct 156 ms 5948 KB Output is correct
66 Correct 122 ms 5956 KB Output is correct
67 Correct 122 ms 5948 KB Output is correct
68 Correct 65 ms 5952 KB Output is correct
69 Correct 63 ms 5924 KB Output is correct
70 Correct 52 ms 5868 KB Output is correct
71 Correct 55 ms 5944 KB Output is correct
72 Correct 44 ms 5872 KB Output is correct
73 Correct 44 ms 6244 KB Output is correct
74 Correct 61 ms 6256 KB Output is correct
75 Correct 79 ms 6252 KB Output is correct
76 Correct 68 ms 6192 KB Output is correct
77 Correct 75 ms 6256 KB Output is correct
78 Correct 78 ms 6188 KB Output is correct
79 Correct 55 ms 6152 KB Output is correct
80 Correct 65 ms 6128 KB Output is correct
81 Correct 69 ms 6208 KB Output is correct
82 Correct 64 ms 6104 KB Output is correct
83 Correct 96 ms 6208 KB Output is correct
84 Correct 76 ms 6108 KB Output is correct
85 Correct 81 ms 6140 KB Output is correct
86 Correct 76 ms 6092 KB Output is correct
87 Correct 77 ms 6168 KB Output is correct
88 Correct 81 ms 6120 KB Output is correct
89 Correct 87 ms 6012 KB Output is correct
90 Correct 91 ms 6116 KB Output is correct
91 Correct 87 ms 6092 KB Output is correct
92 Correct 85 ms 6116 KB Output is correct