#include <bits/stdc++.h>
#define se second
#define fi first
using namespace std;
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
int N, S; cin >> N >> S;
vector<string> grid(N);
for (int i = 0; i < N; i++) {
cin >> grid[i];
}
int start, end;
vector<int> dist(N * N, INT_MAX);
vector<vector<int>> adj(N * N);
queue<pair<int,int>> hives;
for (int i = 0; i < N; i++) {
for (int j = 0; j < N; j++) {
if (grid[i][j] == 'H') {
hives.push({i * N + j, 1});
dist[i * N + j] = 0;
}
else if (grid[i][j] == 'M') start = i * N + j;
else if (grid[i][j] == 'D') end = i * N + j;
if (grid[i][j] == 'H' || grid[i][j] == 'T') continue;
if (i && (grid[i - 1][j] == 'D' || grid[i - 1][j] == 'H' || grid[i - 1][j] == 'M' || grid[i - 1][j] == 'G')) adj[i * N - N + j].push_back(i * N + j);
if (j && (grid[i][j-1] == 'D' || grid[i][j-1] == 'H' || grid[i][j-1] == 'M' || grid[i][j-1] == 'G')) adj[i * N + j-1].push_back(i * N + j);
if (i != N - 1 && (grid[i + 1][j] == 'D' || grid[i + 1][j] == 'H' || grid[i + 1][j] == 'M' || grid[i + 1][j] == 'G')) adj[i * N + N + j].push_back(i * N + j);
if (j != N - 1 && (grid[i][j+1] == 'D' || grid[i][j+1] == 'H' || grid[i][j+1] == 'M' || grid[i][j+1] == 'G')) adj[i * N + j+1].push_back(i * N + j);
}
}
while (!hives.empty()) {
auto x = hives.front(); hives.pop();
for (int y : adj[x.fi]) {
if (dist[y] == INT_MAX && grid[y / N][y % N] != 'D'){
hives.push({y, x.se + 1});
dist[y] = x.se;
}
}
}
int maxi = 0;
for (int x : adj[end]) maxi = max(maxi, dist[x] != INT_MAX ? dist[x] : 0);
vector<bool> pro;
int l = 0, r = N * N / 2 + N;
while (l <= r) {
int mid = l + (r - l) / 2;
pro.clear(); pro.resize(N * N, false);
queue<pair<int,int>> q;
q.push({mid * S, start});
bool won = false;
while (!q.empty() && !won && q.front().fi / S < maxi) {
auto u = q.front(); q.pop();
pro[u.se] = true;
for (int x : adj[u.se]) {
if (x == end) {won = true; break;}
if (!pro[x] && (u.fi + 1) / S < dist[x]) q.push({u.fi + 1, x});
}
}
if (won) l = mid + 1;
else r = mid - 1;
}
cout << l - 1 << '\n';
return 0;
}
Compilation message
mecho.cpp: In function 'int main()':
mecho.cpp:48:22: warning: 'end' may be used uninitialized in this function [-Wmaybe-uninitialized]
48 | for (int x : adj[end]) maxi = max(maxi, dist[x] != INT_MAX ? dist[x] : 0);
| ^
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
0 ms |
344 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
348 KB |
Output is correct |
| 5 |
Correct |
0 ms |
348 KB |
Output is correct |
| 6 |
Correct |
0 ms |
344 KB |
Output is correct |
| 7 |
Runtime error |
164 ms |
65536 KB |
Execution killed with signal 9 |
| 8 |
Correct |
1 ms |
348 KB |
Output is correct |
| 9 |
Correct |
0 ms |
348 KB |
Output is correct |
| 10 |
Correct |
0 ms |
348 KB |
Output is correct |
| 11 |
Correct |
0 ms |
348 KB |
Output is correct |
| 12 |
Correct |
0 ms |
604 KB |
Output is correct |
| 13 |
Runtime error |
244 ms |
65536 KB |
Execution killed with signal 9 |
| 14 |
Runtime error |
193 ms |
65536 KB |
Execution killed with signal 9 |
| 15 |
Correct |
0 ms |
348 KB |
Output is correct |
| 16 |
Correct |
0 ms |
344 KB |
Output is correct |
| 17 |
Correct |
0 ms |
344 KB |
Output is correct |
| 18 |
Correct |
0 ms |
348 KB |
Output is correct |
| 19 |
Correct |
0 ms |
348 KB |
Output is correct |
| 20 |
Correct |
0 ms |
348 KB |
Output is correct |
| 21 |
Correct |
0 ms |
348 KB |
Output is correct |
| 22 |
Correct |
0 ms |
344 KB |
Output is correct |
| 23 |
Correct |
1 ms |
348 KB |
Output is correct |
| 24 |
Correct |
1 ms |
348 KB |
Output is correct |
| 25 |
Correct |
0 ms |
604 KB |
Output is correct |
| 26 |
Correct |
0 ms |
604 KB |
Output is correct |
| 27 |
Correct |
1 ms |
604 KB |
Output is correct |
| 28 |
Correct |
0 ms |
604 KB |
Output is correct |
| 29 |
Correct |
1 ms |
604 KB |
Output is correct |
| 30 |
Correct |
1 ms |
604 KB |
Output is correct |
| 31 |
Correct |
1 ms |
604 KB |
Output is correct |
| 32 |
Correct |
1 ms |
604 KB |
Output is correct |
| 33 |
Correct |
6 ms |
5724 KB |
Output is correct |
| 34 |
Correct |
6 ms |
5724 KB |
Output is correct |
| 35 |
Runtime error |
189 ms |
65536 KB |
Execution killed with signal 9 |
| 36 |
Correct |
9 ms |
7512 KB |
Output is correct |
| 37 |
Correct |
10 ms |
7320 KB |
Output is correct |
| 38 |
Runtime error |
175 ms |
65536 KB |
Execution killed with signal 9 |
| 39 |
Correct |
11 ms |
9308 KB |
Output is correct |
| 40 |
Correct |
9 ms |
9420 KB |
Output is correct |
| 41 |
Runtime error |
178 ms |
65536 KB |
Execution killed with signal 9 |
| 42 |
Correct |
16 ms |
11352 KB |
Output is correct |
| 43 |
Correct |
12 ms |
11356 KB |
Output is correct |
| 44 |
Runtime error |
178 ms |
65536 KB |
Execution killed with signal 9 |
| 45 |
Correct |
17 ms |
13656 KB |
Output is correct |
| 46 |
Correct |
15 ms |
13824 KB |
Output is correct |
| 47 |
Runtime error |
178 ms |
65536 KB |
Execution killed with signal 9 |
| 48 |
Correct |
19 ms |
16216 KB |
Output is correct |
| 49 |
Correct |
17 ms |
16232 KB |
Output is correct |
| 50 |
Runtime error |
178 ms |
65536 KB |
Execution killed with signal 9 |
| 51 |
Correct |
30 ms |
19032 KB |
Output is correct |
| 52 |
Correct |
21 ms |
19036 KB |
Output is correct |
| 53 |
Runtime error |
177 ms |
65536 KB |
Execution killed with signal 9 |
| 54 |
Correct |
26 ms |
22108 KB |
Output is correct |
| 55 |
Correct |
25 ms |
22108 KB |
Output is correct |
| 56 |
Runtime error |
190 ms |
65536 KB |
Execution killed with signal 9 |
| 57 |
Correct |
32 ms |
25176 KB |
Output is correct |
| 58 |
Correct |
31 ms |
25176 KB |
Output is correct |
| 59 |
Runtime error |
177 ms |
65536 KB |
Execution killed with signal 9 |
| 60 |
Correct |
34 ms |
28720 KB |
Output is correct |
| 61 |
Correct |
30 ms |
28668 KB |
Output is correct |
| 62 |
Runtime error |
184 ms |
65536 KB |
Execution killed with signal 9 |
| 63 |
Correct |
98 ms |
30544 KB |
Output is correct |
| 64 |
Correct |
158 ms |
30548 KB |
Output is correct |
| 65 |
Correct |
142 ms |
30544 KB |
Output is correct |
| 66 |
Correct |
116 ms |
30556 KB |
Output is correct |
| 67 |
Correct |
118 ms |
30544 KB |
Output is correct |
| 68 |
Correct |
76 ms |
30552 KB |
Output is correct |
| 69 |
Correct |
86 ms |
30544 KB |
Output is correct |
| 70 |
Correct |
78 ms |
30544 KB |
Output is correct |
| 71 |
Correct |
71 ms |
30672 KB |
Output is correct |
| 72 |
Incorrect |
65 ms |
30636 KB |
Output isn't correct |
| 73 |
Runtime error |
168 ms |
65536 KB |
Execution killed with signal 9 |
| 74 |
Runtime error |
167 ms |
65536 KB |
Execution killed with signal 9 |
| 75 |
Runtime error |
222 ms |
65540 KB |
Execution killed with signal 9 |
| 76 |
Runtime error |
179 ms |
65536 KB |
Execution killed with signal 9 |
| 77 |
Runtime error |
161 ms |
65536 KB |
Execution killed with signal 9 |
| 78 |
Runtime error |
162 ms |
65536 KB |
Execution killed with signal 9 |
| 79 |
Runtime error |
154 ms |
65536 KB |
Execution killed with signal 9 |
| 80 |
Runtime error |
160 ms |
65536 KB |
Execution killed with signal 9 |
| 81 |
Runtime error |
155 ms |
65536 KB |
Execution killed with signal 9 |
| 82 |
Runtime error |
166 ms |
65536 KB |
Execution killed with signal 9 |
| 83 |
Runtime error |
165 ms |
65536 KB |
Execution killed with signal 9 |
| 84 |
Runtime error |
168 ms |
65536 KB |
Execution killed with signal 9 |
| 85 |
Runtime error |
167 ms |
65536 KB |
Execution killed with signal 9 |
| 86 |
Runtime error |
165 ms |
65536 KB |
Execution killed with signal 9 |
| 87 |
Runtime error |
159 ms |
65536 KB |
Execution killed with signal 9 |
| 88 |
Runtime error |
156 ms |
65536 KB |
Execution killed with signal 9 |
| 89 |
Runtime error |
153 ms |
65536 KB |
Execution killed with signal 9 |
| 90 |
Runtime error |
162 ms |
65536 KB |
Execution killed with signal 9 |
| 91 |
Runtime error |
158 ms |
65536 KB |
Execution killed with signal 9 |
| 92 |
Runtime error |
151 ms |
65536 KB |
Execution killed with signal 9 |
