| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 391418 |
2021-04-18T17:28:44 Z |
ml1234 |
Mecho (IOI09_mecho) |
C++17 |
|
274 ms |
6292 KB |
#include <iostream>
#include <string>
#include <queue>
using namespace std;
bool validmecho(int i, int j);
bool validbees(int i, int j);
bool bfs(int starttime);
string grid[800];
int bees[800][800];
int dx[] = {0, -1, 1, 0}, dy[] = {-1, 0, 0, 1};
int n, s;
pair<int, int> mecho;
int main()
{
cin >> n >> s;
for (int i = 0; i < n; i++)
{
cin >> grid[i];
for (int j = 0; j < n; j++)
{
if (grid[i][j] == 'M')
{
mecho = {i, j};
}
}
}
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
{
bees[i][j] = 1e9;
}
}
queue<pair<int, int>> q;
for (int i = 0; i < n; i++)
{
for (int j = 0; j < n; j++)
{
if (grid[i][j] == 'H')
{
q.push({i, j});
bees[i][j] = 0;
}
}
}
while (!q.empty())
{
int curri = q.front().first, currj = q.front().second;
q.pop();
for (int d = 0; d < 4; d++)
{
int nexti = curri + dx[d], nextj = currj + dy[d];
if (validbees(nexti, nextj) && bees[nexti][nextj] > bees[curri][currj] + s)
{
bees[nexti][nextj] = bees[curri][currj] + s;
q.push({nexti, nextj});
}
}
}
int low = -1, high = n * n;
while (low < high)
{
int mid = (low + high + 1) / 2;
if (bfs(mid))
{
low = mid;
}
else
{
high = mid - 1;
}
}
cout << low << endl;
return 0;
}
bool ongrid(int i, int j)
{
return (i >= 0 && i < n && j >= 0 && j < n);
}
bool validbees(int i, int j)
{
return (ongrid(i, j) && !(grid[i][j] == 'T') && !(grid[i][j] == 'D') && !(grid[i][j] == 'H'));
}
bool validmecho(int i, int j)
{
return (ongrid(i, j) && !(grid[i][j] == 'T'));
}
bool bfs(int starttime)
{
if (starttime * s >= bees[mecho.first][mecho.second])
{
return false;
}
queue<pair<int, int>> q;
q.push(mecho);
vector<vector<int>> mechodist(n, vector<int> (n, -1));
mechodist[mecho.first][mecho.second] = starttime * s;
while (!q.empty())
{
int curri = q.front().first, currj = q.front().second;
q.pop();
if (grid[curri][currj] == 'D')
{
return true;
}
for (int d = 0; d < 4; d++)
{
int nexti = curri + dx[d], nextj = currj + dy[d];
if (!validmecho(nexti, nextj))
{
continue;
}
if (mechodist[nexti][nextj] == -1)
{
if (bees[nexti][nextj] > mechodist[curri][currj] + 1)
{
mechodist[nexti][nextj] = mechodist[curri][currj] + 1;
q.push({nexti, nextj});
}
}
}
}
return false;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
332 KB |
Output is correct |
| 2 |
Correct |
1 ms |
332 KB |
Output is correct |
| 3 |
Correct |
1 ms |
332 KB |
Output is correct |
| 4 |
Correct |
1 ms |
332 KB |
Output is correct |
| 5 |
Correct |
1 ms |
332 KB |
Output is correct |
| 6 |
Correct |
1 ms |
332 KB |
Output is correct |
| 7 |
Correct |
142 ms |
6140 KB |
Output is correct |
| 8 |
Correct |
1 ms |
332 KB |
Output is correct |
| 9 |
Correct |
1 ms |
332 KB |
Output is correct |
| 10 |
Correct |
1 ms |
332 KB |
Output is correct |
| 11 |
Correct |
1 ms |
332 KB |
Output is correct |
| 12 |
Correct |
1 ms |
460 KB |
Output is correct |
| 13 |
Correct |
1 ms |
460 KB |
Output is correct |
| 14 |
Correct |
1 ms |
460 KB |
Output is correct |
| 15 |
Correct |
1 ms |
332 KB |
Output is correct |
| 16 |
Correct |
1 ms |
332 KB |
Output is correct |
| 17 |
Correct |
1 ms |
332 KB |
Output is correct |
| 18 |
Correct |
1 ms |
332 KB |
Output is correct |
| 19 |
Correct |
1 ms |
332 KB |
Output is correct |
| 20 |
Correct |
1 ms |
332 KB |
Output is correct |
| 21 |
Correct |
1 ms |
460 KB |
Output is correct |
| 22 |
Correct |
1 ms |
460 KB |
Output is correct |
| 23 |
Correct |
1 ms |
460 KB |
Output is correct |
| 24 |
Correct |
1 ms |
460 KB |
Output is correct |
| 25 |
Correct |
1 ms |
460 KB |
Output is correct |
| 26 |
Correct |
1 ms |
460 KB |
Output is correct |
| 27 |
Correct |
1 ms |
460 KB |
Output is correct |
| 28 |
Correct |
1 ms |
460 KB |
Output is correct |
| 29 |
Correct |
1 ms |
464 KB |
Output is correct |
| 30 |
Correct |
1 ms |
476 KB |
Output is correct |
| 31 |
Correct |
1 ms |
588 KB |
Output is correct |
| 32 |
Correct |
1 ms |
588 KB |
Output is correct |
| 33 |
Correct |
8 ms |
2068 KB |
Output is correct |
| 34 |
Correct |
8 ms |
2080 KB |
Output is correct |
| 35 |
Correct |
31 ms |
2104 KB |
Output is correct |
| 36 |
Correct |
10 ms |
2380 KB |
Output is correct |
| 37 |
Correct |
11 ms |
2420 KB |
Output is correct |
| 38 |
Correct |
42 ms |
2380 KB |
Output is correct |
| 39 |
Correct |
13 ms |
2760 KB |
Output is correct |
| 40 |
Correct |
13 ms |
2764 KB |
Output is correct |
| 41 |
Correct |
53 ms |
2772 KB |
Output is correct |
| 42 |
Correct |
18 ms |
3372 KB |
Output is correct |
| 43 |
Correct |
17 ms |
3384 KB |
Output is correct |
| 44 |
Correct |
69 ms |
3360 KB |
Output is correct |
| 45 |
Correct |
20 ms |
3776 KB |
Output is correct |
| 46 |
Correct |
19 ms |
3788 KB |
Output is correct |
| 47 |
Correct |
78 ms |
3784 KB |
Output is correct |
| 48 |
Correct |
23 ms |
4204 KB |
Output is correct |
| 49 |
Correct |
23 ms |
4208 KB |
Output is correct |
| 50 |
Correct |
107 ms |
4196 KB |
Output is correct |
| 51 |
Correct |
30 ms |
4676 KB |
Output is correct |
| 52 |
Correct |
27 ms |
4652 KB |
Output is correct |
| 53 |
Correct |
118 ms |
4668 KB |
Output is correct |
| 54 |
Correct |
33 ms |
5184 KB |
Output is correct |
| 55 |
Correct |
30 ms |
5112 KB |
Output is correct |
| 56 |
Correct |
142 ms |
5124 KB |
Output is correct |
| 57 |
Correct |
37 ms |
5636 KB |
Output is correct |
| 58 |
Correct |
38 ms |
5624 KB |
Output is correct |
| 59 |
Correct |
167 ms |
5728 KB |
Output is correct |
| 60 |
Correct |
41 ms |
6164 KB |
Output is correct |
| 61 |
Correct |
40 ms |
6140 KB |
Output is correct |
| 62 |
Correct |
201 ms |
6132 KB |
Output is correct |
| 63 |
Correct |
150 ms |
6120 KB |
Output is correct |
| 64 |
Correct |
274 ms |
6244 KB |
Output is correct |
| 65 |
Correct |
206 ms |
6116 KB |
Output is correct |
| 66 |
Correct |
169 ms |
6108 KB |
Output is correct |
| 67 |
Correct |
167 ms |
6252 KB |
Output is correct |
| 68 |
Correct |
93 ms |
6136 KB |
Output is correct |
| 69 |
Correct |
93 ms |
6136 KB |
Output is correct |
| 70 |
Correct |
59 ms |
6148 KB |
Output is correct |
| 71 |
Correct |
67 ms |
6148 KB |
Output is correct |
| 72 |
Correct |
52 ms |
6108 KB |
Output is correct |
| 73 |
Correct |
61 ms |
6160 KB |
Output is correct |
| 74 |
Correct |
96 ms |
6132 KB |
Output is correct |
| 75 |
Correct |
120 ms |
6156 KB |
Output is correct |
| 76 |
Correct |
103 ms |
6148 KB |
Output is correct |
| 77 |
Correct |
102 ms |
6152 KB |
Output is correct |
| 78 |
Correct |
123 ms |
6292 KB |
Output is correct |
| 79 |
Correct |
82 ms |
6140 KB |
Output is correct |
| 80 |
Correct |
101 ms |
6132 KB |
Output is correct |
| 81 |
Correct |
108 ms |
6168 KB |
Output is correct |
| 82 |
Correct |
97 ms |
6140 KB |
Output is correct |
| 83 |
Correct |
131 ms |
6140 KB |
Output is correct |
| 84 |
Correct |
118 ms |
6152 KB |
Output is correct |
| 85 |
Correct |
130 ms |
6224 KB |
Output is correct |
| 86 |
Correct |
138 ms |
6148 KB |
Output is correct |
| 87 |
Correct |
146 ms |
6136 KB |
Output is correct |
| 88 |
Correct |
135 ms |
6136 KB |
Output is correct |
| 89 |
Correct |
132 ms |
6136 KB |
Output is correct |
| 90 |
Correct |
137 ms |
6144 KB |
Output is correct |
| 91 |
Correct |
136 ms |
6140 KB |
Output is correct |
| 92 |
Correct |
146 ms |
6128 KB |
Output is correct |
