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Submission #585401

# Submission time Handle Problem Language Result Execution time Memory
585401 2022-06-28T19:45:11 Z Andrei_Calota Mecho (IOI09_mecho) C++14
95 / 100
 179 ms 6252 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 ) {
           bee_dist[new_line][new_col] = bee_dist[line][column] + 1;
           q.push ( {new_line, new_col} );
         }
      }
   }
}
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 ( (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} );
         }
      }
   }
   if ( dist[house.first][house.second] )
     return true;
   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
95.0 / 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 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 340 KB Output is correct
7 Correct 77 ms 6032 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 0 ms 340 KB Output is correct
12 Incorrect 1 ms 724 KB Output isn't correct
13 Correct 1 ms 596 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 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 552 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 9 ms 2772 KB Output is correct
34 Correct 8 ms 2772 KB Output is correct
35 Correct 26 ms 2772 KB Output is correct
36 Correct 12 ms 3152 KB Output is correct
37 Correct 13 ms 3136 KB Output is correct
38 Correct 30 ms 3144 KB Output is correct
39 Correct 13 ms 3420 KB Output is correct
40 Correct 14 ms 3500 KB Output is correct
41 Correct 33 ms 3480 KB Output is correct
42 Correct 16 ms 3796 KB Output is correct
43 Correct 16 ms 3768 KB Output is correct
44 Correct 40 ms 3796 KB Output is correct
45 Correct 19 ms 4180 KB Output is correct
46 Correct 19 ms 4120 KB Output is correct
47 Correct 45 ms 4180 KB Output is correct
48 Correct 23 ms 4436 KB Output is correct
49 Correct 23 ms 4500 KB Output is correct
50 Correct 54 ms 4436 KB Output is correct
51 Correct 27 ms 4808 KB Output is correct
52 Correct 26 ms 4828 KB Output is correct
53 Correct 78 ms 4896 KB Output is correct
54 Correct 30 ms 5128 KB Output is correct
55 Correct 29 ms 5224 KB Output is correct
56 Correct 79 ms 5156 KB Output is correct
57 Correct 35 ms 5500 KB Output is correct
58 Correct 36 ms 5564 KB Output is correct
59 Correct 100 ms 5596 KB Output is correct
60 Correct 41 ms 5944 KB Output is correct
61 Correct 44 ms 5880 KB Output is correct
62 Correct 112 ms 5956 KB Output is correct
63 Correct 102 ms 5956 KB Output is correct
64 Correct 179 ms 5960 KB Output is correct
65 Correct 154 ms 5956 KB Output is correct
66 Correct 128 ms 5948 KB Output is correct
67 Correct 114 ms 5952 KB Output is correct
68 Correct 58 ms 5912 KB Output is correct
69 Correct 60 ms 5984 KB Output is correct
70 Correct 51 ms 6092 KB Output is correct
71 Correct 59 ms 5904 KB Output is correct
72 Correct 47 ms 5964 KB Output is correct
73 Correct 46 ms 6132 KB Output is correct
74 Correct 59 ms 6220 KB Output is correct
75 Correct 67 ms 6140 KB Output is correct
76 Correct 77 ms 6252 KB Output is correct
77 Correct 69 ms 6180 KB Output is correct
78 Correct 83 ms 6152 KB Output is correct
79 Correct 61 ms 6092 KB Output is correct
80 Correct 62 ms 6180 KB Output is correct
81 Correct 66 ms 6212 KB Output is correct
82 Correct 61 ms 6092 KB Output is correct
83 Correct 74 ms 6152 KB Output is correct
84 Correct 72 ms 6124 KB Output is correct
85 Correct 81 ms 6112 KB Output is correct
86 Correct 72 ms 6096 KB Output is correct
87 Correct 70 ms 6112 KB Output is correct
88 Correct 77 ms 6128 KB Output is correct
89 Correct 98 ms 6112 KB Output is correct
90 Correct 86 ms 6120 KB Output is correct
91 Correct 75 ms 6032 KB Output is correct
92 Correct 79 ms 6112 KB Output is correct