#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
const int MAXN = 800 + 5;
char matrix[MAXN][MAXN];
int distBee[MAXN][MAXN];
int distBear[MAXN][MAXN];
int dx[4] = {0, 1, 0, -1};
int dy[4] = {1, 0, -1, 0};
#define ONLINE_JUDGE
void solve() {
memset(distBee, -1, sizeof(distBee));
int n, s;
cin >> n >> s;
pair <int, int> initial;
pair <int, int> home;
queue <array <int, 3>> q;
for(int i = 1; i <= n; i++) {
for(int j = 1; j <= n; j++) {
cin >> matrix[i][j];
if(matrix[i][j] == 'H') {
q.push({0, i, j});
} else if(matrix[i][j] == 'M') {
initial = {i, j};
} else if(matrix[i][j] == 'D') {
home = {i, j};
}
}
}
auto in = [&](int x, int y) -> bool {
return 1 <= min(x, y) && max(x, y) <= n;
};
while(!q.empty()) {
auto [d, x, y] = q.front();
q.pop();
if(distBee[x][y] != -1) {
continue;
}
distBee[x][y] = d;
for(int dir = 0; dir < 4; dir++) {
int _x = x + dx[dir], _y = y + dy[dir];
if(in(_x, _y) && (matrix[_x][_y] == 'D' || matrix[_x][_y] == 'G')) {
q.push({d +1, _x, _y});
}
}
}
auto check = [&](int k) -> bool {
memset(distBear, -1, sizeof(distBear));
q.push({s * k, initial.first, initial.second});
while(!q.empty()) {
auto [d, x, y] = q.front();
q.pop();
if(distBear[x][y] != -1 || (distBee[x][y] != -1 && d > distBee[x][y] * s)) {
continue;
}
//cerr << d << " :: " << x << " " << y << " | " << distBee[x][y] << "\n";
distBear[x][y] = d;
for(int dir = 0; dir < 4; dir++) {
int _x = x + dx[dir], _y = y + dy[dir];
if(in(_x, _y) && (matrix[_x][_y] == 'G' || matrix[_x][_y] == 'D') && distBear[_x][_y] == -1) {
q.push({d +1, _x, _y});
}
}
}
if(distBear[home.first][home.second] == -1) {
return false;
}
return true;
};
int l = 0, r = n * n + 2, ans = 0;
while(l <= r) {
int mid = (l + r) / 2;
if(check(mid -1)) {
ans = mid;
l = mid +1;
} else {
r = mid -1;
}
}
cout << ans -1;
return;
}
signed main() {
#ifndef ONLINE_JUDGE
freopen(".in", "r", stdin);
freopen(".out", "w", stdout);
#endif
ios_base::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
int t = 1; //cin >> t;
for(int i = 1; i <= t; i++) {
solve();
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
5464 KB |
Output isn't correct |
| 2 |
Incorrect |
1 ms |
5976 KB |
Output isn't correct |
| 3 |
Incorrect |
1 ms |
5468 KB |
Output isn't correct |
| 4 |
Incorrect |
1 ms |
5468 KB |
Output isn't correct |
| 5 |
Correct |
1 ms |
5468 KB |
Output is correct |
| 6 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 7 |
Incorrect |
96 ms |
6652 KB |
Output isn't correct |
| 8 |
Incorrect |
1 ms |
5468 KB |
Output isn't correct |
| 9 |
Correct |
1 ms |
5468 KB |
Output is correct |
| 10 |
Correct |
1 ms |
5468 KB |
Output is correct |
| 11 |
Correct |
2 ms |
5468 KB |
Output is correct |
| 12 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 13 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 14 |
Correct |
2 ms |
5468 KB |
Output is correct |
| 15 |
Incorrect |
2 ms |
5464 KB |
Output isn't correct |
| 16 |
Correct |
2 ms |
5544 KB |
Output is correct |
| 17 |
Incorrect |
1 ms |
5468 KB |
Output isn't correct |
| 18 |
Correct |
1 ms |
5468 KB |
Output is correct |
| 19 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 20 |
Correct |
1 ms |
5464 KB |
Output is correct |
| 21 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 22 |
Correct |
2 ms |
5468 KB |
Output is correct |
| 23 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 24 |
Correct |
1 ms |
5468 KB |
Output is correct |
| 25 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 26 |
Correct |
2 ms |
5468 KB |
Output is correct |
| 27 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 28 |
Correct |
2 ms |
5464 KB |
Output is correct |
| 29 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 30 |
Correct |
2 ms |
5468 KB |
Output is correct |
| 31 |
Incorrect |
2 ms |
5468 KB |
Output isn't correct |
| 32 |
Correct |
2 ms |
5468 KB |
Output is correct |
| 33 |
Incorrect |
5 ms |
5724 KB |
Output isn't correct |
| 34 |
Correct |
5 ms |
5724 KB |
Output is correct |
| 35 |
Correct |
21 ms |
5724 KB |
Output is correct |
| 36 |
Incorrect |
6 ms |
5724 KB |
Output isn't correct |
| 37 |
Correct |
6 ms |
5724 KB |
Output is correct |
| 38 |
Correct |
27 ms |
5684 KB |
Output is correct |
| 39 |
Incorrect |
7 ms |
5724 KB |
Output isn't correct |
| 40 |
Correct |
7 ms |
5724 KB |
Output is correct |
| 41 |
Correct |
35 ms |
5724 KB |
Output is correct |
| 42 |
Incorrect |
8 ms |
5720 KB |
Output isn't correct |
| 43 |
Correct |
9 ms |
5720 KB |
Output is correct |
| 44 |
Correct |
50 ms |
5920 KB |
Output is correct |
| 45 |
Incorrect |
9 ms |
5724 KB |
Output isn't correct |
| 46 |
Correct |
10 ms |
5788 KB |
Output is correct |
| 47 |
Correct |
48 ms |
5980 KB |
Output is correct |
| 48 |
Incorrect |
11 ms |
5980 KB |
Output isn't correct |
| 49 |
Correct |
14 ms |
5980 KB |
Output is correct |
| 50 |
Correct |
57 ms |
5980 KB |
Output is correct |
| 51 |
Incorrect |
12 ms |
5980 KB |
Output isn't correct |
| 52 |
Correct |
13 ms |
5976 KB |
Output is correct |
| 53 |
Correct |
73 ms |
6052 KB |
Output is correct |
| 54 |
Incorrect |
14 ms |
5980 KB |
Output isn't correct |
| 55 |
Correct |
17 ms |
5944 KB |
Output is correct |
| 56 |
Correct |
84 ms |
6100 KB |
Output is correct |
| 57 |
Incorrect |
17 ms |
5980 KB |
Output isn't correct |
| 58 |
Correct |
17 ms |
5980 KB |
Output is correct |
| 59 |
Correct |
100 ms |
5984 KB |
Output is correct |
| 60 |
Incorrect |
20 ms |
6488 KB |
Output isn't correct |
| 61 |
Correct |
19 ms |
5980 KB |
Output is correct |
| 62 |
Correct |
110 ms |
6180 KB |
Output is correct |
| 63 |
Correct |
82 ms |
5980 KB |
Output is correct |
| 64 |
Correct |
109 ms |
5980 KB |
Output is correct |
| 65 |
Correct |
114 ms |
6152 KB |
Output is correct |
| 66 |
Incorrect |
103 ms |
5972 KB |
Output isn't correct |
| 67 |
Correct |
87 ms |
5980 KB |
Output is correct |
| 68 |
Correct |
43 ms |
6056 KB |
Output is correct |
| 69 |
Correct |
47 ms |
6236 KB |
Output is correct |
| 70 |
Correct |
34 ms |
6072 KB |
Output is correct |
| 71 |
Correct |
30 ms |
6488 KB |
Output is correct |
| 72 |
Incorrect |
33 ms |
6236 KB |
Output isn't correct |
| 73 |
Incorrect |
75 ms |
7724 KB |
Output isn't correct |
| 74 |
Correct |
65 ms |
7776 KB |
Output is correct |
| 75 |
Correct |
68 ms |
7784 KB |
Output is correct |
| 76 |
Correct |
67 ms |
7772 KB |
Output is correct |
| 77 |
Correct |
69 ms |
7620 KB |
Output is correct |
| 78 |
Correct |
81 ms |
7620 KB |
Output is correct |
| 79 |
Correct |
52 ms |
7508 KB |
Output is correct |
| 80 |
Correct |
66 ms |
7508 KB |
Output is correct |
| 81 |
Correct |
78 ms |
7508 KB |
Output is correct |
| 82 |
Correct |
84 ms |
7396 KB |
Output is correct |
| 83 |
Correct |
81 ms |
7380 KB |
Output is correct |
| 84 |
Correct |
73 ms |
7228 KB |
Output is correct |
| 85 |
Correct |
72 ms |
7252 KB |
Output is correct |
| 86 |
Correct |
83 ms |
7204 KB |
Output is correct |
| 87 |
Correct |
78 ms |
7260 KB |
Output is correct |
| 88 |
Correct |
81 ms |
6896 KB |
Output is correct |
| 89 |
Correct |
89 ms |
7096 KB |
Output is correct |
| 90 |
Correct |
87 ms |
7004 KB |
Output is correct |
| 91 |
Correct |
93 ms |
6908 KB |
Output is correct |
| 92 |
Correct |
95 ms |
7148 KB |
Output is correct |
