| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 242018 |
2020-06-26T14:22:29 Z |
Autoratch |
Mecho (IOI09_mecho) |
C++14 |
|
252 ms |
4600 KB |
#include <bits/stdc++.h>
using namespace std;
const int N = 801;
int n,s,sx,sy,tx,ty;
char c[N][N];
int bee[N][N];
bool visited[N][N];
queue<pair<pair<int,int>,int> > qb,q;
void flybee()
{
while(!qb.empty())
{
int t = qb.front().second,x = qb.front().first.first,y = qb.front().first.second;
qb.pop();
for(int i = -1;i <= 1;i++) for(int j = -1;j <= 1;j++)
{
if(i!=0 and j!=0) continue;
if(i==0 and j==0) continue;
int ai = x+i,aj = y+j;
if(ai<1 or ai>n or aj<1 or aj>n) continue;
if(c[ai][aj]=='D' or c[ai][aj]=='T') continue;
if(visited[ai][aj]) continue;
visited[ai][aj] = true;
bee[ai][aj] = t+1;
qb.push({{ai,aj},t+1});
}
}
}
bool solve(int m)
{
if(m>=bee[sx][sy]) return false;
for(int i = 1;i <= n;i++) for(int j = 1;j <= n;j++) visited[i][j] = false;
while(!q.empty()) q.pop();
q.push({{sx,sy},0});
visited[sx][sy] = true;
while(!q.empty())
{
int x = q.front().first.first,y = q.front().first.second,tm = q.front().second;
q.pop();
if(x==tx and y==ty) return true;
for(int i = -1;i <= 1;i++) for(int j = -1;j <= 1;j++)
{
if(i!=0 and j!=0) continue;
if(i==0 and j==0) continue;
int ai = x+i,aj = y+j;
if(ai<1 or ai>n or aj<1 or aj>n) continue;
if(c[ai][aj]=='T') continue;
if(visited[ai][aj]) continue;
if(1LL*tm+1>=1LL*(bee[ai][aj]-m)*s) continue;
q.push({{ai,aj},tm+1});
visited[ai][aj] = true;
}
}
return false;
}
int main()
{
ios_base::sync_with_stdio(0); cin.tie(0);
cin >> n >> s;
for(int i = 1;i <= n;i++) for(int j = 1;j <= n;j++) cin >> c[i][j],bee[i][j] = INT_MAX;
for(int i = 1;i <= n;i++) for(int j = 1;j <= n;j++)
if(c[i][j]=='H') qb.push({{i,j},0}),bee[i][j] = 0,visited[i][j] = true;
else if(c[i][j]=='M') sx = i,sy = j;
else if(c[i][j]=='D') tx = i,ty = j;
flybee();
int l = 0,r = n*n;
while(l<r)
{
int m = (l+r+1)/2;
if(solve(m)) l = m;
else r = m-1;
}
if(solve(l)) cout << l;
else cout << "-1";
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
5 ms |
384 KB |
Output is correct |
| 2 |
Correct |
5 ms |
384 KB |
Output is correct |
| 3 |
Correct |
5 ms |
384 KB |
Output is correct |
| 4 |
Correct |
5 ms |
384 KB |
Output is correct |
| 5 |
Correct |
5 ms |
384 KB |
Output is correct |
| 6 |
Correct |
4 ms |
384 KB |
Output is correct |
| 7 |
Correct |
134 ms |
4216 KB |
Output is correct |
| 8 |
Correct |
5 ms |
384 KB |
Output is correct |
| 9 |
Correct |
5 ms |
384 KB |
Output is correct |
| 10 |
Correct |
5 ms |
384 KB |
Output is correct |
| 11 |
Correct |
5 ms |
384 KB |
Output is correct |
| 12 |
Correct |
5 ms |
640 KB |
Output is correct |
| 13 |
Correct |
5 ms |
640 KB |
Output is correct |
| 14 |
Correct |
5 ms |
640 KB |
Output is correct |
| 15 |
Correct |
5 ms |
384 KB |
Output is correct |
| 16 |
Correct |
5 ms |
384 KB |
Output is correct |
| 17 |
Correct |
4 ms |
512 KB |
Output is correct |
| 18 |
Correct |
5 ms |
512 KB |
Output is correct |
| 19 |
Correct |
5 ms |
512 KB |
Output is correct |
| 20 |
Correct |
5 ms |
512 KB |
Output is correct |
| 21 |
Correct |
5 ms |
512 KB |
Output is correct |
| 22 |
Correct |
5 ms |
512 KB |
Output is correct |
| 23 |
Correct |
5 ms |
640 KB |
Output is correct |
| 24 |
Correct |
5 ms |
640 KB |
Output is correct |
| 25 |
Correct |
5 ms |
640 KB |
Output is correct |
| 26 |
Correct |
6 ms |
640 KB |
Output is correct |
| 27 |
Correct |
5 ms |
640 KB |
Output is correct |
| 28 |
Correct |
5 ms |
640 KB |
Output is correct |
| 29 |
Correct |
5 ms |
640 KB |
Output is correct |
| 30 |
Correct |
5 ms |
640 KB |
Output is correct |
| 31 |
Correct |
5 ms |
640 KB |
Output is correct |
| 32 |
Correct |
5 ms |
640 KB |
Output is correct |
| 33 |
Correct |
10 ms |
2048 KB |
Output is correct |
| 34 |
Correct |
11 ms |
2048 KB |
Output is correct |
| 35 |
Correct |
34 ms |
2048 KB |
Output is correct |
| 36 |
Correct |
11 ms |
2176 KB |
Output is correct |
| 37 |
Correct |
12 ms |
2176 KB |
Output is correct |
| 38 |
Correct |
46 ms |
2176 KB |
Output is correct |
| 39 |
Correct |
13 ms |
2432 KB |
Output is correct |
| 40 |
Correct |
14 ms |
2432 KB |
Output is correct |
| 41 |
Correct |
56 ms |
2560 KB |
Output is correct |
| 42 |
Correct |
15 ms |
2688 KB |
Output is correct |
| 43 |
Correct |
16 ms |
2688 KB |
Output is correct |
| 44 |
Correct |
71 ms |
2808 KB |
Output is correct |
| 45 |
Correct |
18 ms |
2944 KB |
Output is correct |
| 46 |
Correct |
20 ms |
2944 KB |
Output is correct |
| 47 |
Correct |
81 ms |
3000 KB |
Output is correct |
| 48 |
Correct |
19 ms |
3200 KB |
Output is correct |
| 49 |
Correct |
20 ms |
3200 KB |
Output is correct |
| 50 |
Correct |
98 ms |
3200 KB |
Output is correct |
| 51 |
Correct |
22 ms |
3456 KB |
Output is correct |
| 52 |
Correct |
22 ms |
3456 KB |
Output is correct |
| 53 |
Correct |
121 ms |
3456 KB |
Output is correct |
| 54 |
Correct |
25 ms |
3584 KB |
Output is correct |
| 55 |
Correct |
26 ms |
3704 KB |
Output is correct |
| 56 |
Correct |
128 ms |
3712 KB |
Output is correct |
| 57 |
Correct |
26 ms |
3840 KB |
Output is correct |
| 58 |
Correct |
28 ms |
3840 KB |
Output is correct |
| 59 |
Correct |
150 ms |
3960 KB |
Output is correct |
| 60 |
Correct |
30 ms |
4128 KB |
Output is correct |
| 61 |
Correct |
32 ms |
4088 KB |
Output is correct |
| 62 |
Correct |
180 ms |
4216 KB |
Output is correct |
| 63 |
Correct |
139 ms |
4096 KB |
Output is correct |
| 64 |
Correct |
252 ms |
4216 KB |
Output is correct |
| 65 |
Correct |
205 ms |
4096 KB |
Output is correct |
| 66 |
Correct |
164 ms |
4096 KB |
Output is correct |
| 67 |
Correct |
152 ms |
4260 KB |
Output is correct |
| 68 |
Correct |
79 ms |
4096 KB |
Output is correct |
| 69 |
Correct |
62 ms |
4096 KB |
Output is correct |
| 70 |
Correct |
67 ms |
4096 KB |
Output is correct |
| 71 |
Correct |
59 ms |
4224 KB |
Output is correct |
| 72 |
Correct |
45 ms |
4096 KB |
Output is correct |
| 73 |
Correct |
53 ms |
4480 KB |
Output is correct |
| 74 |
Correct |
80 ms |
4480 KB |
Output is correct |
| 75 |
Correct |
100 ms |
4480 KB |
Output is correct |
| 76 |
Correct |
96 ms |
4480 KB |
Output is correct |
| 77 |
Correct |
102 ms |
4480 KB |
Output is correct |
| 78 |
Correct |
110 ms |
4480 KB |
Output is correct |
| 79 |
Correct |
71 ms |
4472 KB |
Output is correct |
| 80 |
Correct |
84 ms |
4600 KB |
Output is correct |
| 81 |
Correct |
99 ms |
4472 KB |
Output is correct |
| 82 |
Correct |
89 ms |
4472 KB |
Output is correct |
| 83 |
Correct |
114 ms |
4596 KB |
Output is correct |
| 84 |
Correct |
109 ms |
4348 KB |
Output is correct |
| 85 |
Correct |
114 ms |
4532 KB |
Output is correct |
| 86 |
Correct |
123 ms |
4348 KB |
Output is correct |
| 87 |
Correct |
117 ms |
4340 KB |
Output is correct |
| 88 |
Correct |
125 ms |
4344 KB |
Output is correct |
| 89 |
Correct |
134 ms |
4352 KB |
Output is correct |
| 90 |
Correct |
135 ms |
4332 KB |
Output is correct |
| 91 |
Correct |
123 ms |
4344 KB |
Output is correct |
| 92 |
Correct |
126 ms |
4344 KB |
Output is correct |
