| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 996965 |
2024-06-11T14:16:35 Z |
imann |
Mecho (IOI09_mecho) |
C++17 |
|
121 ms |
6908 KB |
#include <iostream>
#include <array>
#include <string>
#include <queue>
const int MAX_N = 800 + 1;
const int INF = 1e9;
std::array<std::string, MAX_N> grid;
std::array<std::array<int, MAX_N>, MAX_N> minuteToBeHive, level;
void bfs(int n) {
std::queue<std::pair<int, int>> q;
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
minuteToBeHive[i][j] = INF;
if (grid[i][j] == 'H') {
q.push({i, j});
minuteToBeHive[i][j] = 0;
}
}
}
while (!q.empty()) {
auto v = q.front();
q.pop();
if (v.first > 0) {
if (grid[v.first - 1][v.second] == 'G') {
if (minuteToBeHive[v.first - 1][v.second] == INF)
q.push({v.first - 1, v.second});
minuteToBeHive[v.first - 1][v.second] = std::min(minuteToBeHive[v.first - 1][v.second], minuteToBeHive[v.first][v.second] + 1);
}
}
if (v.first < n - 1) {
if (grid[v.first + 1][v.second] == 'G') {
if (minuteToBeHive[v.first + 1][v.second] == INF)
q.push({v.first + 1, v.second});
minuteToBeHive[v.first + 1][v.second] = std::min(minuteToBeHive[v.first + 1][v.second], minuteToBeHive[v.first][v.second] + 1);
}
}
if (v.second > 0) {
if (grid[v.first][v.second - 1] == 'G') {
if (minuteToBeHive[v.first][v.second - 1] == INF)
q.push({v.first, v.second - 1});
minuteToBeHive[v.first][v.second - 1] = std::min(minuteToBeHive[v.first][v.second - 1], minuteToBeHive[v.first][v.second] + 1);
}
}
if (v.second < n - 1) {
if (grid[v.first][v.second - 1] == 'G') {
if (minuteToBeHive[v.first][v.second + 1] == INF)
q.push({v.first, v.second + 1});
minuteToBeHive[v.first][v.second + 1] = std::min(minuteToBeHive[v.first][v.second + 1], minuteToBeHive[v.first][v.second] + 1);
}
}
}
}
bool bfs2(int n, int s, int startMinute) {
std::pair<int, int> start, end;
std::queue<std::pair<int, int>> q;
for (int i = 0; i < n; ++i) {
for (int j = 0; j < n; ++j) {
level[i][j] = INF;
if (grid[i][j] == 'M')
start = {i, j};
if (grid[i][j] == 'D')
end = {i, j};
}
}
q.push(start);
level[start.first][start.second] = 0;
while (!q.empty()) {
auto v = q.front();
q.pop();
if (v.first > 0) {
if ((grid[v.first - 1][v.second] == 'G' || grid[v.first - 1][v.second] == 'D') && (startMinute + (level[v.first][v.second] + 1) / s < minuteToBeHive[v.first - 1][v.second])) {
if (level[v.first - 1][v.second] == INF)
q.push({v.first - 1, v.second});
level[v.first - 1][v.second] = std::min(level[v.first - 1][v.second], level[v.first][v.second] + 1);
}
}
if (v.first < n - 1) {
if ((grid[v.first + 1][v.second] == 'G' || grid[v.first + 1][v.second] == 'D') && (startMinute + (level[v.first][v.second] + 1) / s < minuteToBeHive[v.first + 1][v.second])) {
if (level[v.first + 1][v.second] == INF)
q.push({v.first + 1, v.second});
level[v.first + 1][v.second] = std::min(level[v.first + 1][v.second], level[v.first][v.second] + 1);
}
}
if (v.second > 0) {
if ((grid[v.first][v.second - 1] == 'G' || grid[v.first][v.second - 1] == 'D') && (startMinute + (level[v.first][v.second] + 1) / s < minuteToBeHive[v.first][v.second - 1])) {
if (level[v.first][v.second - 1] == INF)
q.push({v.first, v.second - 1});
level[v.first][v.second - 1] = std::min(level[v.first][v.second - 1], level[v.first][v.second] + 1);
}
}
if (v.second < n - 1) {
if ((grid[v.first][v.second + 1] == 'G' || grid[v.first][v.second + 1] == 'D') && (startMinute + (level[v.first][v.second] + 1) / s < minuteToBeHive[v.first][v.second + 1])) {
if (level[v.first][v.second + 1] == INF)
q.push({v.first, v.second + 1});
level[v.first][v.second + 1] = std::min(level[v.first][v.second + 1], level[v.first][v.second] + 1);
}
}
}
return level[end.first][end.second] != INF;
}
int solve(int n, int s) {
bfs(n);
int l = 0, r = n;
while (r - l > 1) {
int mid = (r + l) / 2;
if (bfs2(n, s, mid)) {
l = mid;
} else {
r = mid;
}
}
if (bfs2(n, s, l))
return l;
return -1;
}
int main() {
int n, s; std::cin >> n >> s;
for (int i = 0; i < n; ++i) {
std::cin >> grid[i];
}
std::cout << solve(n, s) << std::endl;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
2392 KB |
Output is correct |
| 2 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 3 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 4 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 5 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 6 |
Correct |
0 ms |
2396 KB |
Output is correct |
| 7 |
Correct |
60 ms |
6156 KB |
Output is correct |
| 8 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 9 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 10 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 11 |
Correct |
1 ms |
2396 KB |
Output is correct |
| 12 |
Incorrect |
1 ms |
4700 KB |
Output isn't correct |
| 13 |
Incorrect |
1 ms |
2652 KB |
Output isn't correct |
| 14 |
Correct |
1 ms |
4576 KB |
Output is correct |
| 15 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
| 16 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
| 17 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
| 18 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
| 19 |
Incorrect |
0 ms |
2396 KB |
Output isn't correct |
| 20 |
Incorrect |
1 ms |
2396 KB |
Output isn't correct |
| 21 |
Incorrect |
1 ms |
2648 KB |
Output isn't correct |
| 22 |
Incorrect |
1 ms |
2652 KB |
Output isn't correct |
| 23 |
Incorrect |
1 ms |
2652 KB |
Output isn't correct |
| 24 |
Incorrect |
1 ms |
2652 KB |
Output isn't correct |
| 25 |
Incorrect |
1 ms |
4696 KB |
Output isn't correct |
| 26 |
Incorrect |
1 ms |
4700 KB |
Output isn't correct |
| 27 |
Incorrect |
1 ms |
4700 KB |
Output isn't correct |
| 28 |
Incorrect |
1 ms |
4700 KB |
Output isn't correct |
| 29 |
Incorrect |
1 ms |
4700 KB |
Output isn't correct |
| 30 |
Incorrect |
1 ms |
4696 KB |
Output isn't correct |
| 31 |
Incorrect |
1 ms |
4700 KB |
Output isn't correct |
| 32 |
Incorrect |
1 ms |
4700 KB |
Output isn't correct |
| 33 |
Incorrect |
14 ms |
4956 KB |
Output isn't correct |
| 34 |
Incorrect |
10 ms |
5016 KB |
Output isn't correct |
| 35 |
Incorrect |
13 ms |
4832 KB |
Output isn't correct |
| 36 |
Incorrect |
19 ms |
4956 KB |
Output isn't correct |
| 37 |
Incorrect |
13 ms |
4956 KB |
Output isn't correct |
| 38 |
Incorrect |
17 ms |
4956 KB |
Output isn't correct |
| 39 |
Incorrect |
22 ms |
4956 KB |
Output isn't correct |
| 40 |
Incorrect |
16 ms |
4956 KB |
Output isn't correct |
| 41 |
Incorrect |
22 ms |
5132 KB |
Output isn't correct |
| 42 |
Incorrect |
27 ms |
5212 KB |
Output isn't correct |
| 43 |
Incorrect |
20 ms |
5212 KB |
Output isn't correct |
| 44 |
Incorrect |
28 ms |
5212 KB |
Output isn't correct |
| 45 |
Incorrect |
36 ms |
5204 KB |
Output isn't correct |
| 46 |
Incorrect |
28 ms |
5468 KB |
Output isn't correct |
| 47 |
Incorrect |
31 ms |
5504 KB |
Output isn't correct |
| 48 |
Incorrect |
43 ms |
5468 KB |
Output isn't correct |
| 49 |
Incorrect |
31 ms |
5464 KB |
Output isn't correct |
| 50 |
Incorrect |
37 ms |
5464 KB |
Output isn't correct |
| 51 |
Incorrect |
50 ms |
5724 KB |
Output isn't correct |
| 52 |
Incorrect |
36 ms |
5720 KB |
Output isn't correct |
| 53 |
Incorrect |
47 ms |
5736 KB |
Output isn't correct |
| 54 |
Incorrect |
62 ms |
5980 KB |
Output isn't correct |
| 55 |
Incorrect |
42 ms |
5980 KB |
Output isn't correct |
| 56 |
Incorrect |
53 ms |
5980 KB |
Output isn't correct |
| 57 |
Incorrect |
66 ms |
6340 KB |
Output isn't correct |
| 58 |
Incorrect |
48 ms |
6456 KB |
Output isn't correct |
| 59 |
Incorrect |
60 ms |
6236 KB |
Output isn't correct |
| 60 |
Incorrect |
77 ms |
6492 KB |
Output isn't correct |
| 61 |
Incorrect |
61 ms |
6488 KB |
Output isn't correct |
| 62 |
Incorrect |
73 ms |
6492 KB |
Output isn't correct |
| 63 |
Incorrect |
44 ms |
6404 KB |
Output isn't correct |
| 64 |
Incorrect |
121 ms |
6604 KB |
Output isn't correct |
| 65 |
Incorrect |
99 ms |
6484 KB |
Output isn't correct |
| 66 |
Incorrect |
47 ms |
6444 KB |
Output isn't correct |
| 67 |
Correct |
73 ms |
6492 KB |
Output is correct |
| 68 |
Incorrect |
38 ms |
6748 KB |
Output isn't correct |
| 69 |
Incorrect |
37 ms |
6648 KB |
Output isn't correct |
| 70 |
Incorrect |
33 ms |
6612 KB |
Output isn't correct |
| 71 |
Incorrect |
33 ms |
6484 KB |
Output isn't correct |
| 72 |
Incorrect |
30 ms |
6480 KB |
Output isn't correct |
| 73 |
Incorrect |
35 ms |
6748 KB |
Output isn't correct |
| 74 |
Correct |
43 ms |
6740 KB |
Output is correct |
| 75 |
Correct |
50 ms |
6792 KB |
Output is correct |
| 76 |
Correct |
56 ms |
6812 KB |
Output is correct |
| 77 |
Correct |
52 ms |
6792 KB |
Output is correct |
| 78 |
Correct |
56 ms |
6744 KB |
Output is correct |
| 79 |
Correct |
44 ms |
6744 KB |
Output is correct |
| 80 |
Correct |
60 ms |
6856 KB |
Output is correct |
| 81 |
Correct |
70 ms |
6860 KB |
Output is correct |
| 82 |
Correct |
49 ms |
6740 KB |
Output is correct |
| 83 |
Correct |
57 ms |
6748 KB |
Output is correct |
| 84 |
Correct |
64 ms |
6492 KB |
Output is correct |
| 85 |
Correct |
65 ms |
6736 KB |
Output is correct |
| 86 |
Correct |
62 ms |
6716 KB |
Output is correct |
| 87 |
Correct |
55 ms |
6744 KB |
Output is correct |
| 88 |
Correct |
57 ms |
6908 KB |
Output is correct |
| 89 |
Correct |
63 ms |
6740 KB |
Output is correct |
| 90 |
Correct |
64 ms |
6668 KB |
Output is correct |
| 91 |
Correct |
63 ms |
6744 KB |
Output is correct |
| 92 |
Correct |
63 ms |
6740 KB |
Output is correct |
