import java.io.*;
import java.util.*;
public class mecho {
public static void main(String[] args) throws IOException {
BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
//BufferedReader bf = new BufferedReader(new FileReader("tester.in"));
PrintWriter pw = new PrintWriter(new OutputStreamWriter(System.out));
StringTokenizer stk = new StringTokenizer(bf.readLine());
int N = Integer.parseInt(stk.nextToken());
int S = Integer.parseInt(stk.nextToken());
String[][] grid = new String[N][N];
boolean[][] visited = new boolean[N][N];
LinkedList<pair> list = new LinkedList<>();
int[][] bees = new int[N][N];
int startx = 0, starty = 0, homex = 0, homey = 0;
for(int i = 0; i < N; i++){
String line = bf.readLine();
String[] str = line.split("");
Arrays.fill(bees[i], Integer.MAX_VALUE);
for(int c = 0; c < N; c++){
grid[i][c] = str[c];
if(grid[i][c].equals("H")){
list.add(new pair(i, c, 0));
visited[i][c] = true;
bees[i][c] = 0;
}
if(grid[i][c].equals("M")){
startx = i;
starty = c;
}
if(grid[i][c].equals("D")){
homex = i;
homey = c;
}
}
}
int[] dx = new int[]{0, 1, 0, -1};
int[] dy = new int[]{1, 0, -1, 0};
while(!list.isEmpty()){
pair p = list.pop();
if(p.x == homex && p.y == homey)continue;
if(grid[p.x][p.y].equals("T"))continue;
bees[p.x][p.y] = Math.min(bees[p.x][p.y], p.t+S);
for(int i = 0; i < 4; i++){
int nx = p.x+dx[i];
int ny = p.y+dy[i];
if(N <= nx || nx < 0 || N <= ny || ny < 0 || visited[nx][ny])continue;
list.add(new pair(nx, ny, bees[p.x][p.y]));
visited[nx][ny] = true;
}
}
bees[homex][homey] = Integer.MAX_VALUE;
int start = 0, end = 10000000;
while(start != end){
int mid = (start+end+1)/2;
if(verify(bees, grid, mid, startx, starty, homex, homey, N, S))start = mid;
else end = mid-1;
}
if(!verify(bees, grid, 0, startx, starty, homex, homey, N, S))System.out.println(-1);
else System.out.println(start);
}
public static boolean verify(int[][] bees, String[][] grid, int time, int startx, int starty, int homex, int homey, int N, int S){
LinkedList<pair> q = new LinkedList<>();
q.add(new pair(startx, starty, time*S));
int[] dx = new int[]{0, 1, 0, -1};
int[] dy = new int[]{1, 0, -1, 0};
boolean[][] visited = new boolean[N][N];
visited[startx][starty] = true;
while(!q.isEmpty()){
pair p = q.poll();
if(p.t >= bees[p.x][p.y])continue;
for(int i = 0; i < 4; i++){
int nx = p.x+dx[i];
int ny = p.y+dy[i];
if(N <= nx || nx < 0 || N <= ny || ny < 0)continue;
if(grid[nx][ny].equals("T")||grid[nx][ny].equals("H"))continue;
if(bees[nx][ny] <= p.t+1 || visited[nx][ny])continue;
q.add(new pair(nx, ny, p.t+1));
visited[nx][ny] = true;
}
}
return (visited[homex][homey]);
}
public static class pair implements Comparable<pair>{
int x, y, t;
public pair(int a, int b, int c){
x = a;
y = b;
t = c;
}
@Override
public int compareTo(pair o) {
if(x==o.x&&y==o.y)return Integer.compare(t, o.t);
if(x==o.x)return Integer.compare(y, o.y);
return Integer.compare(x, o.x);
}
public boolean equals(pair o){
if(x == o.x && y == o.y && t == o.t)return true;
return false;
}
}
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
72 ms |
8684 KB |
Output is correct |
| 2 |
Correct |
77 ms |
8556 KB |
Output is correct |
| 3 |
Correct |
72 ms |
8684 KB |
Output is correct |
| 4 |
Correct |
74 ms |
8768 KB |
Output is correct |
| 5 |
Correct |
72 ms |
8684 KB |
Output is correct |
| 6 |
Correct |
74 ms |
8684 KB |
Output is correct |
| 7 |
Runtime error |
772 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 8 |
Correct |
77 ms |
8936 KB |
Output is correct |
| 9 |
Correct |
78 ms |
8684 KB |
Output is correct |
| 10 |
Correct |
81 ms |
8668 KB |
Output is correct |
| 11 |
Correct |
78 ms |
8684 KB |
Output is correct |
| 12 |
Correct |
113 ms |
9580 KB |
Output is correct |
| 13 |
Correct |
108 ms |
9452 KB |
Output is correct |
| 14 |
Correct |
178 ms |
11820 KB |
Output is correct |
| 15 |
Correct |
82 ms |
8940 KB |
Output is correct |
| 16 |
Correct |
78 ms |
8812 KB |
Output is correct |
| 17 |
Correct |
89 ms |
9196 KB |
Output is correct |
| 18 |
Correct |
90 ms |
9068 KB |
Output is correct |
| 19 |
Correct |
92 ms |
9068 KB |
Output is correct |
| 20 |
Correct |
96 ms |
9308 KB |
Output is correct |
| 21 |
Correct |
101 ms |
9324 KB |
Output is correct |
| 22 |
Correct |
102 ms |
9452 KB |
Output is correct |
| 23 |
Correct |
109 ms |
9552 KB |
Output is correct |
| 24 |
Correct |
113 ms |
9452 KB |
Output is correct |
| 25 |
Correct |
124 ms |
9600 KB |
Output is correct |
| 26 |
Correct |
148 ms |
11800 KB |
Output is correct |
| 27 |
Correct |
128 ms |
9836 KB |
Output is correct |
| 28 |
Correct |
187 ms |
12488 KB |
Output is correct |
| 29 |
Correct |
135 ms |
10092 KB |
Output is correct |
| 30 |
Correct |
197 ms |
12488 KB |
Output is correct |
| 31 |
Correct |
169 ms |
11860 KB |
Output is correct |
| 32 |
Correct |
162 ms |
12192 KB |
Output is correct |
| 33 |
Correct |
573 ms |
24652 KB |
Output is correct |
| 34 |
Correct |
680 ms |
24528 KB |
Output is correct |
| 35 |
Correct |
733 ms |
25924 KB |
Output is correct |
| 36 |
Correct |
499 ms |
26988 KB |
Output is correct |
| 37 |
Correct |
583 ms |
26996 KB |
Output is correct |
| 38 |
Correct |
786 ms |
28080 KB |
Output is correct |
| 39 |
Correct |
630 ms |
32940 KB |
Output is correct |
| 40 |
Correct |
756 ms |
33004 KB |
Output is correct |
| 41 |
Execution timed out |
1096 ms |
33660 KB |
Time limit exceeded |
| 42 |
Correct |
665 ms |
36836 KB |
Output is correct |
| 43 |
Correct |
764 ms |
37096 KB |
Output is correct |
| 44 |
Execution timed out |
1098 ms |
37748 KB |
Time limit exceeded |
| 45 |
Correct |
680 ms |
38904 KB |
Output is correct |
| 46 |
Correct |
782 ms |
39308 KB |
Output is correct |
| 47 |
Execution timed out |
1093 ms |
40248 KB |
Time limit exceeded |
| 48 |
Correct |
698 ms |
43480 KB |
Output is correct |
| 49 |
Correct |
792 ms |
43928 KB |
Output is correct |
| 50 |
Execution timed out |
1099 ms |
44652 KB |
Time limit exceeded |
| 51 |
Correct |
767 ms |
53164 KB |
Output is correct |
| 52 |
Correct |
866 ms |
53912 KB |
Output is correct |
| 53 |
Execution timed out |
1072 ms |
54912 KB |
Time limit exceeded |
| 54 |
Correct |
765 ms |
55736 KB |
Output is correct |
| 55 |
Correct |
867 ms |
56764 KB |
Output is correct |
| 56 |
Execution timed out |
1100 ms |
57324 KB |
Time limit exceeded |
| 57 |
Correct |
797 ms |
60960 KB |
Output is correct |
| 58 |
Correct |
910 ms |
61248 KB |
Output is correct |
| 59 |
Execution timed out |
1099 ms |
62060 KB |
Time limit exceeded |
| 60 |
Runtime error |
652 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 61 |
Runtime error |
685 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 62 |
Runtime error |
649 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 63 |
Runtime error |
701 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 64 |
Runtime error |
731 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 65 |
Runtime error |
731 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 66 |
Runtime error |
730 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 67 |
Runtime error |
692 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 68 |
Runtime error |
813 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 69 |
Runtime error |
797 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 70 |
Runtime error |
827 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 71 |
Runtime error |
834 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 72 |
Runtime error |
826 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 73 |
Runtime error |
694 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 74 |
Runtime error |
698 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 75 |
Runtime error |
695 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 76 |
Runtime error |
693 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 77 |
Runtime error |
710 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 78 |
Runtime error |
780 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 79 |
Runtime error |
750 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 80 |
Runtime error |
779 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 81 |
Runtime error |
766 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 82 |
Runtime error |
759 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 83 |
Runtime error |
753 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 84 |
Runtime error |
752 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 85 |
Runtime error |
754 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 86 |
Runtime error |
716 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 87 |
Runtime error |
755 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 88 |
Runtime error |
761 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 89 |
Runtime error |
773 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 90 |
Runtime error |
749 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 91 |
Runtime error |
751 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
| 92 |
Runtime error |
764 ms |
65536 KB |
Execution killed with signal 9 (could be triggered by violating memory limits) |
