| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 646057 |
2022-09-28T14:34:03 Z |
ymm |
Mecho (IOI09_mecho) |
C++17 |
|
170 ms |
9564 KB |
#include <bits/stdc++.h>
#define Loop(x,l,r) for (ll x = (l); x < (r); ++x)
#define LoopR(x,l,r) for (ll x = (r)-1; x >= (l); --x)
typedef long long ll;
typedef std::pair<int, int> pii;
typedef std::pair<ll , ll > pll;
using namespace std;
const int N = 810;
char forest[N][N];
int near_bee[N][N];
int bhi, bhj, bsi, bsj;
ll n, s;
bool can_go_bear(int i, int j)
{
return 0 <= i && i < n && 0 <= j && j < n
&& forest[i][j] != 'T';
}
bool can_go_bee(int i, int j)
{
return 0 <= i && i < n && 0 <= j && j < n
&& forest[i][j] != 'T' && forest[i][j] != 'D';
}
void bfs_bee()
{
queue<pii> q;
memset(near_bee, -1, sizeof(near_bee));
Loop (i,0,n) Loop (j,0,n) {
if (forest[i][j] == 'H') {
near_bee[i][j] = 0;
q.push({i, j});
}
}
while (q.size()) {
auto [i, j] = q.front();
q.pop();
int d = near_bee[i][j];
for (auto [x_, y_] : {pii{0,1}, {0,-1}, {1,0}, {-1,0}}) {
int x = i+x_, y = j+y_;
if (!can_go_bee(x, y))
continue;
if (near_bee[x][y] != -1)
continue;
near_bee[x][y] = d+1;
q.push({x, y});
}
}
}
void find_bear()
{
Loop (i,0,n) Loop (j,0,n) {
if (forest[i][j] == 'D') {
bhi = i;
bhj = j;
}
if (forest[i][j] == 'M') {
bsi = i;
bsj = j;
}
}
}
bool bfs_bear(int wait)
{
if (wait >= near_bee[bsi][bsj])
return 0;
static ll dis[N][N];
memset(dis, -1, sizeof(dis));
queue<pii> q;
q.push({bsi, bsj});
dis[bsi][bsj] = (ll)wait * s;
while (q.size()) {
auto [i, j] = q.front();
q.pop();
ll d = dis[i][j];
for (auto [x_, y_] : {pii{0,1}, {0,-1}, {1,0}, {-1,0}}) {
int x = i+x_, y = j+y_;
if (!can_go_bear(x, y))
continue;
if (near_bee[x][y] != -1
&& near_bee[x][y] <= (d+1)/s)
continue;
if (dis[x][y] != -1)
continue;
dis[x][y] = d+1;
q.push({x, y});
}
}
return dis[bhi][bhj] != -1;
}
int main()
{
cin.tie(0) -> sync_with_stdio(false);
cin >> n >> s;
Loop (i,0,n)
cin >> forest[i];
bfs_bee();
find_bear();
int l = -1, r = near_bee[bsi][bsj]-1;
while (l < r) {
int mid = (l+r+1)/2;
if (bfs_bear(mid))
l = mid;
else
r = mid-1;
}
cout << l << '\n';
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
4 ms |
8008 KB |
Output is correct |
| 2 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 3 |
Correct |
4 ms |
8020 KB |
Output is correct |
| 4 |
Correct |
4 ms |
8020 KB |
Output is correct |
| 5 |
Correct |
4 ms |
8020 KB |
Output is correct |
| 6 |
Correct |
4 ms |
8020 KB |
Output is correct |
| 7 |
Correct |
142 ms |
9380 KB |
Output is correct |
| 8 |
Correct |
4 ms |
8020 KB |
Output is correct |
| 9 |
Correct |
4 ms |
8020 KB |
Output is correct |
| 10 |
Correct |
4 ms |
8008 KB |
Output is correct |
| 11 |
Correct |
4 ms |
8008 KB |
Output is correct |
| 12 |
Correct |
4 ms |
8020 KB |
Output is correct |
| 13 |
Correct |
3 ms |
8020 KB |
Output is correct |
| 14 |
Correct |
5 ms |
8016 KB |
Output is correct |
| 15 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 16 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 17 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 18 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 19 |
Correct |
6 ms |
8020 KB |
Output is correct |
| 20 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 21 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 22 |
Correct |
5 ms |
8004 KB |
Output is correct |
| 23 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 24 |
Correct |
5 ms |
8072 KB |
Output is correct |
| 25 |
Correct |
6 ms |
8008 KB |
Output is correct |
| 26 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 27 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 28 |
Correct |
8 ms |
8036 KB |
Output is correct |
| 29 |
Correct |
6 ms |
8052 KB |
Output is correct |
| 30 |
Correct |
5 ms |
8088 KB |
Output is correct |
| 31 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 32 |
Correct |
5 ms |
8020 KB |
Output is correct |
| 33 |
Correct |
9 ms |
8404 KB |
Output is correct |
| 34 |
Correct |
9 ms |
8404 KB |
Output is correct |
| 35 |
Correct |
31 ms |
8404 KB |
Output is correct |
| 36 |
Correct |
12 ms |
8508 KB |
Output is correct |
| 37 |
Correct |
10 ms |
8500 KB |
Output is correct |
| 38 |
Correct |
30 ms |
8404 KB |
Output is correct |
| 39 |
Correct |
10 ms |
8588 KB |
Output is correct |
| 40 |
Correct |
10 ms |
8532 KB |
Output is correct |
| 41 |
Correct |
42 ms |
8540 KB |
Output is correct |
| 42 |
Correct |
11 ms |
8672 KB |
Output is correct |
| 43 |
Correct |
11 ms |
8572 KB |
Output is correct |
| 44 |
Correct |
45 ms |
8660 KB |
Output is correct |
| 45 |
Correct |
12 ms |
8660 KB |
Output is correct |
| 46 |
Correct |
15 ms |
8748 KB |
Output is correct |
| 47 |
Correct |
53 ms |
8660 KB |
Output is correct |
| 48 |
Correct |
12 ms |
8788 KB |
Output is correct |
| 49 |
Correct |
15 ms |
8796 KB |
Output is correct |
| 50 |
Correct |
78 ms |
8852 KB |
Output is correct |
| 51 |
Correct |
19 ms |
8916 KB |
Output is correct |
| 52 |
Correct |
15 ms |
8920 KB |
Output is correct |
| 53 |
Correct |
88 ms |
8916 KB |
Output is correct |
| 54 |
Correct |
15 ms |
9036 KB |
Output is correct |
| 55 |
Correct |
17 ms |
9048 KB |
Output is correct |
| 56 |
Correct |
89 ms |
9056 KB |
Output is correct |
| 57 |
Correct |
18 ms |
9172 KB |
Output is correct |
| 58 |
Correct |
20 ms |
9044 KB |
Output is correct |
| 59 |
Correct |
126 ms |
9040 KB |
Output is correct |
| 60 |
Correct |
20 ms |
9172 KB |
Output is correct |
| 61 |
Correct |
20 ms |
9172 KB |
Output is correct |
| 62 |
Correct |
137 ms |
9280 KB |
Output is correct |
| 63 |
Correct |
100 ms |
9276 KB |
Output is correct |
| 64 |
Correct |
170 ms |
9276 KB |
Output is correct |
| 65 |
Correct |
149 ms |
9164 KB |
Output is correct |
| 66 |
Correct |
112 ms |
9280 KB |
Output is correct |
| 67 |
Correct |
100 ms |
9280 KB |
Output is correct |
| 68 |
Correct |
40 ms |
9308 KB |
Output is correct |
| 69 |
Correct |
35 ms |
9184 KB |
Output is correct |
| 70 |
Correct |
32 ms |
9304 KB |
Output is correct |
| 71 |
Correct |
29 ms |
9292 KB |
Output is correct |
| 72 |
Correct |
32 ms |
9292 KB |
Output is correct |
| 73 |
Correct |
40 ms |
9556 KB |
Output is correct |
| 74 |
Correct |
61 ms |
9428 KB |
Output is correct |
| 75 |
Correct |
58 ms |
9552 KB |
Output is correct |
| 76 |
Correct |
64 ms |
9556 KB |
Output is correct |
| 77 |
Correct |
62 ms |
9548 KB |
Output is correct |
| 78 |
Correct |
80 ms |
9400 KB |
Output is correct |
| 79 |
Correct |
64 ms |
9528 KB |
Output is correct |
| 80 |
Correct |
61 ms |
9428 KB |
Output is correct |
| 81 |
Correct |
61 ms |
9528 KB |
Output is correct |
| 82 |
Correct |
58 ms |
9528 KB |
Output is correct |
| 83 |
Correct |
108 ms |
9488 KB |
Output is correct |
| 84 |
Correct |
94 ms |
9564 KB |
Output is correct |
| 85 |
Correct |
72 ms |
9548 KB |
Output is correct |
| 86 |
Correct |
79 ms |
9484 KB |
Output is correct |
| 87 |
Correct |
69 ms |
9488 KB |
Output is correct |
| 88 |
Correct |
103 ms |
9428 KB |
Output is correct |
| 89 |
Correct |
108 ms |
9432 KB |
Output is correct |
| 90 |
Correct |
93 ms |
9424 KB |
Output is correct |
| 91 |
Correct |
89 ms |
9436 KB |
Output is correct |
| 92 |
Correct |
84 ms |
9436 KB |
Output is correct |
