| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 713175 |
2023-03-21T09:23:40 Z |
ismayil |
Mecho (IOI09_mecho) |
C++17 |
|
268 ms |
21620 KB |
#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int INF = 0x3f3f3f3f;
char grid[801][801];
ll dis_b[801][801], color_b[801][801];
ll color[801][801], dis[801][801];
ll dx[4] = {0, 0, 1, -1};
ll dy[4] = {1, -1, 0, 0};
ll n, s;
pair<ll, ll> finish;
bool valid(ll i, ll j){
return (0 <= i && i < n && 0 <= j && j < n);
}
void bfs_b(queue<pair<ll, ll>> &q){
while(!q.empty()){
ll x = q.front().first, y = q.front().second;
q.pop();
for(ll i = 0; i < 4; i++){
if(valid(x + dx[i], y + dy[i]) && !color_b[x + dx[i]][y + dy[i]] &&
(grid[x + dx[i]][y + dy[i]] == 'G' || grid[x + dx[i]][y + dy[i]] == 'M')){
dis_b[x + dx[i]][y + dy[i]] = dis_b[x][y] + 1;
color_b[x + dx[i]][y + dy[i]] = 1;
q.push({x + dx[i], y + dy[i]});
}
}
}
}
bool bfs_m(ll i, ll j, ll t){
memset(color, 0, sizeof(color));
memset(dis, 0, sizeof(dis));
dis[i][j] = t;
color[i][j] = 1;
if(dis[i][j] >= dis_b[i][j] * s) return false;
queue<pair<ll, ll>> q;
q.push({i, j});
while(!q.empty()){
ll x = q.front().first, y = q.front().second;
q.pop();
for(ll i = 0; i < 4; i++){
if(valid(x + dx[i], y + dy[i]) && !color[x + dx[i]][y + dy[i]] &&
(dis[x][y] + 1 < dis_b[x + dx[i]][y + dy[i]] * s || grid[x + dx[i]][y + dy[i]] == 'D') &&
(grid[x + dx[i]][y + dy[i]] == 'G' || grid[x + dx[i]][y + dy[i]] == 'D')){
dis[x + dx[i]][y + dy[i]] = dis[x][y] + 1;
color[x + dx[i]][y + dy[i]] = 1;
q.push({x + dx[i], y + dy[i]});
}
}
}
return color[finish.first][finish.second];
}
int main() {
ios::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin>>n>>s;
if(n == 1){
cout<<-1;
return 0;
}
queue<pair<ll, ll>> b, m;
for(ll i = 0; i < n; i++){
for(ll j = 0; j < n; j++){
cin>>grid[i][j];
if(grid[i][j] == 'H'){
b.push({i, j});
color_b[i][j] = 1;
dis_b[i][j] = 0;
}else if(grid[i][j] == 'M'){
m.push({i, j});
}else if(grid[i][j] == 'D'){
finish = {i, j};
}
}
}
bfs_b(b);
if(!bfs_m(m.front().first, m.front().second, 0)){
cout<<-1;
return 0;
}
ll l = 0, r = 2e9;
ll ans = 0;
while(l <= r){
ll mid = (l + r) / 2;
if(bfs_m(m.front().first, m.front().second, s * mid)){
l = mid + 1;
ans = max(ans, mid);
}else r = mid - 1;
}
cout<<ans;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
35 ms |
10404 KB |
Output is correct |
| 2 |
Correct |
36 ms |
10316 KB |
Output is correct |
| 3 |
Correct |
32 ms |
10324 KB |
Output is correct |
| 4 |
Correct |
30 ms |
10324 KB |
Output is correct |
| 5 |
Correct |
34 ms |
10432 KB |
Output is correct |
| 6 |
Correct |
32 ms |
10452 KB |
Output is correct |
| 7 |
Correct |
140 ms |
21244 KB |
Output is correct |
| 8 |
Correct |
4 ms |
10452 KB |
Output is correct |
| 9 |
Correct |
30 ms |
10452 KB |
Output is correct |
| 10 |
Correct |
32 ms |
10500 KB |
Output is correct |
| 11 |
Correct |
37 ms |
10452 KB |
Output is correct |
| 12 |
Correct |
34 ms |
10952 KB |
Output is correct |
| 13 |
Correct |
31 ms |
10836 KB |
Output is correct |
| 14 |
Correct |
4 ms |
10836 KB |
Output is correct |
| 15 |
Correct |
36 ms |
10556 KB |
Output is correct |
| 16 |
Correct |
39 ms |
10452 KB |
Output is correct |
| 17 |
Correct |
32 ms |
10580 KB |
Output is correct |
| 18 |
Correct |
33 ms |
10588 KB |
Output is correct |
| 19 |
Correct |
36 ms |
10580 KB |
Output is correct |
| 20 |
Correct |
34 ms |
10580 KB |
Output is correct |
| 21 |
Correct |
39 ms |
10708 KB |
Output is correct |
| 22 |
Correct |
40 ms |
10708 KB |
Output is correct |
| 23 |
Correct |
33 ms |
10836 KB |
Output is correct |
| 24 |
Correct |
34 ms |
10836 KB |
Output is correct |
| 25 |
Correct |
32 ms |
10916 KB |
Output is correct |
| 26 |
Correct |
32 ms |
10936 KB |
Output is correct |
| 27 |
Correct |
31 ms |
10996 KB |
Output is correct |
| 28 |
Correct |
34 ms |
10964 KB |
Output is correct |
| 29 |
Correct |
40 ms |
10964 KB |
Output is correct |
| 30 |
Correct |
46 ms |
10964 KB |
Output is correct |
| 31 |
Correct |
41 ms |
11072 KB |
Output is correct |
| 32 |
Correct |
34 ms |
11104 KB |
Output is correct |
| 33 |
Correct |
44 ms |
14164 KB |
Output is correct |
| 34 |
Correct |
39 ms |
14676 KB |
Output is correct |
| 35 |
Correct |
61 ms |
14932 KB |
Output is correct |
| 36 |
Correct |
49 ms |
14804 KB |
Output is correct |
| 37 |
Correct |
45 ms |
15432 KB |
Output is correct |
| 38 |
Correct |
69 ms |
15700 KB |
Output is correct |
| 39 |
Correct |
40 ms |
15352 KB |
Output is correct |
| 40 |
Correct |
45 ms |
16188 KB |
Output is correct |
| 41 |
Correct |
81 ms |
16372 KB |
Output is correct |
| 42 |
Correct |
56 ms |
15908 KB |
Output is correct |
| 43 |
Correct |
47 ms |
16852 KB |
Output is correct |
| 44 |
Correct |
101 ms |
16980 KB |
Output is correct |
| 45 |
Correct |
47 ms |
16456 KB |
Output is correct |
| 46 |
Correct |
54 ms |
17568 KB |
Output is correct |
| 47 |
Correct |
122 ms |
17620 KB |
Output is correct |
| 48 |
Correct |
51 ms |
16992 KB |
Output is correct |
| 49 |
Correct |
61 ms |
18156 KB |
Output is correct |
| 50 |
Correct |
136 ms |
18376 KB |
Output is correct |
| 51 |
Correct |
55 ms |
17528 KB |
Output is correct |
| 52 |
Correct |
74 ms |
18572 KB |
Output is correct |
| 53 |
Correct |
188 ms |
19004 KB |
Output is correct |
| 54 |
Correct |
58 ms |
18036 KB |
Output is correct |
| 55 |
Correct |
60 ms |
19168 KB |
Output is correct |
| 56 |
Correct |
178 ms |
19692 KB |
Output is correct |
| 57 |
Correct |
51 ms |
18644 KB |
Output is correct |
| 58 |
Correct |
65 ms |
19668 KB |
Output is correct |
| 59 |
Correct |
203 ms |
20308 KB |
Output is correct |
| 60 |
Correct |
56 ms |
19156 KB |
Output is correct |
| 61 |
Correct |
57 ms |
20044 KB |
Output is correct |
| 62 |
Correct |
211 ms |
21036 KB |
Output is correct |
| 63 |
Correct |
181 ms |
21032 KB |
Output is correct |
| 64 |
Correct |
268 ms |
21024 KB |
Output is correct |
| 65 |
Correct |
241 ms |
21028 KB |
Output is correct |
| 66 |
Correct |
213 ms |
21024 KB |
Output is correct |
| 67 |
Correct |
42 ms |
20908 KB |
Output is correct |
| 68 |
Correct |
92 ms |
21000 KB |
Output is correct |
| 69 |
Correct |
91 ms |
21080 KB |
Output is correct |
| 70 |
Correct |
81 ms |
21088 KB |
Output is correct |
| 71 |
Correct |
82 ms |
21020 KB |
Output is correct |
| 72 |
Correct |
73 ms |
21036 KB |
Output is correct |
| 73 |
Correct |
87 ms |
21552 KB |
Output is correct |
| 74 |
Correct |
124 ms |
21440 KB |
Output is correct |
| 75 |
Correct |
111 ms |
21556 KB |
Output is correct |
| 76 |
Correct |
102 ms |
21512 KB |
Output is correct |
| 77 |
Correct |
109 ms |
21508 KB |
Output is correct |
| 78 |
Correct |
42 ms |
21452 KB |
Output is correct |
| 79 |
Correct |
130 ms |
21620 KB |
Output is correct |
| 80 |
Correct |
110 ms |
21488 KB |
Output is correct |
| 81 |
Correct |
110 ms |
21384 KB |
Output is correct |
| 82 |
Correct |
117 ms |
21500 KB |
Output is correct |
| 83 |
Correct |
140 ms |
21512 KB |
Output is correct |
| 84 |
Correct |
132 ms |
21412 KB |
Output is correct |
| 85 |
Correct |
125 ms |
21412 KB |
Output is correct |
| 86 |
Correct |
140 ms |
21452 KB |
Output is correct |
| 87 |
Correct |
134 ms |
21320 KB |
Output is correct |
| 88 |
Correct |
139 ms |
21212 KB |
Output is correct |
| 89 |
Correct |
150 ms |
21320 KB |
Output is correct |
| 90 |
Correct |
151 ms |
21324 KB |
Output is correct |
| 91 |
Correct |
155 ms |
21316 KB |
Output is correct |
| 92 |
Correct |
140 ms |
21196 KB |
Output is correct |
