#include<bits/stdc++.h>
using namespace std ;
const int N = 1000 ;
string ma[N] ;
int dist[N][N], dist2[N][N] ;
int X [] = {0,0,-1,1}, Y[] = {1,-1,0,0} ;
int visi[N][N] ;
int main() {
int n, s ;
cin >> n >> s ;
for ( int i = 0 ; i < n ; ++i ) cin >> ma[i] ;
queue <pair<int,int>> bfs ;
pair<int,int> bg, en ;
for ( int i = 0 ; i < n ; ++i ) {
for ( int j = 0 ; j < n ; ++j ) {
if ( ma[i][j] == 'H' ) bfs.push({i,j}), dist2[i][j] = 0, visi[i][j] = 1 ;
if ( ma[i][j] == 'T' ) visi[i][j] = 1 ;
if ( ma[i][j] == 'M' ) bg = {i,j} ;
if ( ma[i][j] == 'D' ) en = {i,j} ;
}
}
while ( bfs.size() ) {
pair<int,int> cur = bfs.front() ;
bfs.pop() ;
for ( int k = 0 ; k < 4 ; ++k ) {
int nwx = X[k] + cur.first ;
int nwy = Y[k] + cur.second ;
if ( nwx < 0 || nwy < 0 || nwx >= n || nwy >= n || visi[nwx][nwy] ) continue ;
visi[nwx][nwy] = 1 ;
dist2[nwx][nwy] = 1 + dist2[cur.first][cur.second] ;
bfs.push({nwx, nwy}) ;
}
}
int lw = 0, hg = 1000000000 ;
while ( lw <= hg ) {
int mid = (lw+hg) / 2 ;
memset ( visi, 0, sizeof visi ) ;
memset ( dist, 0, sizeof dist ) ;
if ( mid < dist2[bg.first][bg.second] ) bfs.push(bg) ;
visi[bg.first][bg.second] = 1 ;
while ( bfs.size() ) {
pair<int,int> cur = bfs.front() ;
bfs.pop() ;
for ( int k = 0 ; k < 4 ; ++k ) {
int nwx = X[k] + cur.first ;
int nwy = Y[k] + cur.second ;
if ( nwx < 0 || nwy < 0 || nwx >= n || nwy >= n || visi[nwx][nwy] || ma[nwx][nwy] == 'T' ) continue ;
if ( (nwx != en.first || nwy != en.second) && (1 + dist[cur.first][cur.second]) / s + mid >= dist2[nwx][nwy] ) continue ;
visi[nwx][nwy] = 1 ;
dist[nwx][nwy] = 1 + dist[cur.first][cur.second] ;
bfs.push({nwx, nwy}) ;
}
}
if ( visi[en.first][en.second] ) lw = mid+1 ;
else hg = mid-1 ;
}
cout << hg << endl ;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
30 ms |
8192 KB |
Output is correct |
| 2 |
Correct |
22 ms |
8192 KB |
Output is correct |
| 3 |
Correct |
18 ms |
8192 KB |
Output is correct |
| 4 |
Correct |
19 ms |
8192 KB |
Output is correct |
| 5 |
Correct |
18 ms |
8192 KB |
Output is correct |
| 6 |
Correct |
30 ms |
8192 KB |
Output is correct |
| 7 |
Correct |
133 ms |
12280 KB |
Output is correct |
| 8 |
Correct |
18 ms |
8192 KB |
Output is correct |
| 9 |
Correct |
19 ms |
8192 KB |
Output is correct |
| 10 |
Correct |
18 ms |
8192 KB |
Output is correct |
| 11 |
Correct |
18 ms |
8192 KB |
Output is correct |
| 12 |
Incorrect |
18 ms |
8448 KB |
Output isn't correct |
| 13 |
Correct |
30 ms |
8320 KB |
Output is correct |
| 14 |
Correct |
22 ms |
8448 KB |
Output is correct |
| 15 |
Correct |
19 ms |
8192 KB |
Output is correct |
| 16 |
Correct |
23 ms |
8192 KB |
Output is correct |
| 17 |
Correct |
25 ms |
8320 KB |
Output is correct |
| 18 |
Correct |
20 ms |
8320 KB |
Output is correct |
| 19 |
Correct |
19 ms |
8320 KB |
Output is correct |
| 20 |
Correct |
22 ms |
8320 KB |
Output is correct |
| 21 |
Correct |
20 ms |
8320 KB |
Output is correct |
| 22 |
Correct |
20 ms |
8320 KB |
Output is correct |
| 23 |
Correct |
22 ms |
8424 KB |
Output is correct |
| 24 |
Correct |
18 ms |
8320 KB |
Output is correct |
| 25 |
Correct |
19 ms |
8448 KB |
Output is correct |
| 26 |
Correct |
19 ms |
8448 KB |
Output is correct |
| 27 |
Correct |
21 ms |
8448 KB |
Output is correct |
| 28 |
Correct |
20 ms |
8448 KB |
Output is correct |
| 29 |
Correct |
31 ms |
8448 KB |
Output is correct |
| 30 |
Correct |
20 ms |
8448 KB |
Output is correct |
| 31 |
Correct |
21 ms |
8448 KB |
Output is correct |
| 32 |
Correct |
28 ms |
8448 KB |
Output is correct |
| 33 |
Correct |
39 ms |
9848 KB |
Output is correct |
| 34 |
Correct |
28 ms |
9728 KB |
Output is correct |
| 35 |
Correct |
60 ms |
9728 KB |
Output is correct |
| 36 |
Correct |
39 ms |
9976 KB |
Output is correct |
| 37 |
Correct |
37 ms |
9984 KB |
Output is correct |
| 38 |
Correct |
71 ms |
9984 KB |
Output is correct |
| 39 |
Correct |
35 ms |
10112 KB |
Output is correct |
| 40 |
Correct |
60 ms |
10112 KB |
Output is correct |
| 41 |
Correct |
63 ms |
10112 KB |
Output is correct |
| 42 |
Correct |
62 ms |
10624 KB |
Output is correct |
| 43 |
Correct |
35 ms |
10624 KB |
Output is correct |
| 44 |
Correct |
108 ms |
10620 KB |
Output is correct |
| 45 |
Correct |
38 ms |
10872 KB |
Output is correct |
| 46 |
Correct |
47 ms |
10880 KB |
Output is correct |
| 47 |
Correct |
98 ms |
10872 KB |
Output is correct |
| 48 |
Correct |
43 ms |
11136 KB |
Output is correct |
| 49 |
Correct |
44 ms |
11136 KB |
Output is correct |
| 50 |
Correct |
120 ms |
11256 KB |
Output is correct |
| 51 |
Correct |
46 ms |
11392 KB |
Output is correct |
| 52 |
Correct |
48 ms |
11388 KB |
Output is correct |
| 53 |
Correct |
127 ms |
11384 KB |
Output is correct |
| 54 |
Correct |
54 ms |
11512 KB |
Output is correct |
| 55 |
Correct |
64 ms |
11512 KB |
Output is correct |
| 56 |
Correct |
153 ms |
11640 KB |
Output is correct |
| 57 |
Correct |
55 ms |
11768 KB |
Output is correct |
| 58 |
Correct |
62 ms |
11768 KB |
Output is correct |
| 59 |
Correct |
164 ms |
11916 KB |
Output is correct |
| 60 |
Correct |
63 ms |
12024 KB |
Output is correct |
| 61 |
Correct |
60 ms |
12024 KB |
Output is correct |
| 62 |
Correct |
197 ms |
12024 KB |
Output is correct |
| 63 |
Correct |
153 ms |
12152 KB |
Output is correct |
| 64 |
Correct |
253 ms |
12024 KB |
Output is correct |
| 65 |
Correct |
244 ms |
12024 KB |
Output is correct |
| 66 |
Correct |
174 ms |
12152 KB |
Output is correct |
| 67 |
Correct |
165 ms |
12024 KB |
Output is correct |
| 68 |
Correct |
104 ms |
12152 KB |
Output is correct |
| 69 |
Correct |
98 ms |
12152 KB |
Output is correct |
| 70 |
Correct |
73 ms |
12024 KB |
Output is correct |
| 71 |
Correct |
82 ms |
12024 KB |
Output is correct |
| 72 |
Correct |
76 ms |
12152 KB |
Output is correct |
| 73 |
Correct |
93 ms |
12284 KB |
Output is correct |
| 74 |
Correct |
118 ms |
12408 KB |
Output is correct |
| 75 |
Correct |
124 ms |
12280 KB |
Output is correct |
| 76 |
Correct |
114 ms |
12312 KB |
Output is correct |
| 77 |
Correct |
124 ms |
12280 KB |
Output is correct |
| 78 |
Correct |
116 ms |
12408 KB |
Output is correct |
| 79 |
Correct |
100 ms |
12376 KB |
Output is correct |
| 80 |
Correct |
105 ms |
12280 KB |
Output is correct |
| 81 |
Correct |
113 ms |
12280 KB |
Output is correct |
| 82 |
Correct |
102 ms |
12280 KB |
Output is correct |
| 83 |
Correct |
127 ms |
12408 KB |
Output is correct |
| 84 |
Correct |
118 ms |
12280 KB |
Output is correct |
| 85 |
Correct |
121 ms |
12280 KB |
Output is correct |
| 86 |
Correct |
125 ms |
12280 KB |
Output is correct |
| 87 |
Correct |
122 ms |
12280 KB |
Output is correct |
| 88 |
Correct |
139 ms |
12280 KB |
Output is correct |
| 89 |
Correct |
136 ms |
12284 KB |
Output is correct |
| 90 |
Correct |
148 ms |
12280 KB |
Output is correct |
| 91 |
Correct |
138 ms |
12280 KB |
Output is correct |
| 92 |
Correct |
139 ms |
12280 KB |
Output is correct |
