| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 941732 |
2024-03-09T11:25:58 Z |
RavenHead |
Mecho (IOI09_mecho) |
C++17 |
|
146 ms |
11420 KB |
/*
- Binary search by answer
- BFS on all cells that Mecho can beat the bees to
*/
#include <bits/stdc++.h>
using namespace std;
const int mxN=800;
int n, s, d1[mxN][mxN], d2[mxN][mxN], si, sj, ti, tj, lb=0, rb=mxN*mxN, nb[4][2]={{0, 1}, {1, 0}, {0, -1}, {-1, 0}};
string g[mxN];
array<int, 2> qu[mxN*mxN];
void bfs(int d[mxN][mxN], int a) {
int qt=0;
for(int i=0; i<n; ++i)
for(int j=0; j<n; ++j)
if(!d[i][j])
qu[qt++]={i, j};
for(int i=0; i<qt; ++i) {
array<int, 2> u=qu[i];
if(a>=0&&d[u[0]][u[1]]/s+a>=d1[u[0]][u[1]])
continue;
for(int j=0; j<4; ++j) {
int ni=u[0]+nb[j][0], nj=u[1]+nb[j][1];
if(ni>=0&&ni<n&&nj>=0&&nj<n&&g[ni][nj]!='T'&&(a>=0||g[ni][nj]!='D')&&d[ni][nj]>1e7) {
d[ni][nj]=d[u[0]][u[1]]+1;
qu[qt++]={ni, nj};
}
}
}
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cin >> n >> s;
for(int i=0; i<n; ++i)
cin >> g[i];
memset(d1, 1, sizeof(d1));
for(int i=0; i<n; ++i) {
for(int j=0; j<n; ++j) {
if(g[i][j]=='M') {
si=i;
sj=j;
} else if(g[i][j]=='D') {
ti=i;
tj=j;
} else if(g[i][j]=='H')
d1[i][j]=0;
}
}
bfs(d1, -1);
while(lb<=rb) {
int mb=(lb+rb)/2;
memset(d2, 1, sizeof(d2));
d2[si][sj]=0;
bfs(d2, mb);
if(d2[ti][tj]<1e7)
lb=mb+1;
else
rb=mb-1;
}
cout << rb;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
5976 KB |
Output is correct |
| 2 |
Correct |
3 ms |
5980 KB |
Output is correct |
| 3 |
Correct |
3 ms |
5980 KB |
Output is correct |
| 4 |
Correct |
4 ms |
6136 KB |
Output is correct |
| 5 |
Correct |
2 ms |
5980 KB |
Output is correct |
| 6 |
Correct |
3 ms |
5980 KB |
Output is correct |
| 7 |
Correct |
71 ms |
11164 KB |
Output is correct |
| 8 |
Correct |
2 ms |
5980 KB |
Output is correct |
| 9 |
Correct |
3 ms |
5980 KB |
Output is correct |
| 10 |
Correct |
2 ms |
5980 KB |
Output is correct |
| 11 |
Correct |
3 ms |
6232 KB |
Output is correct |
| 12 |
Correct |
2 ms |
6236 KB |
Output is correct |
| 13 |
Correct |
3 ms |
6236 KB |
Output is correct |
| 14 |
Correct |
3 ms |
6248 KB |
Output is correct |
| 15 |
Correct |
3 ms |
5980 KB |
Output is correct |
| 16 |
Correct |
3 ms |
5980 KB |
Output is correct |
| 17 |
Correct |
2 ms |
5980 KB |
Output is correct |
| 18 |
Correct |
2 ms |
5976 KB |
Output is correct |
| 19 |
Correct |
2 ms |
5980 KB |
Output is correct |
| 20 |
Correct |
2 ms |
5980 KB |
Output is correct |
| 21 |
Correct |
3 ms |
5980 KB |
Output is correct |
| 22 |
Correct |
2 ms |
6232 KB |
Output is correct |
| 23 |
Correct |
2 ms |
6080 KB |
Output is correct |
| 24 |
Correct |
3 ms |
5976 KB |
Output is correct |
| 25 |
Correct |
4 ms |
6488 KB |
Output is correct |
| 26 |
Correct |
3 ms |
6236 KB |
Output is correct |
| 27 |
Correct |
3 ms |
6236 KB |
Output is correct |
| 28 |
Correct |
3 ms |
6232 KB |
Output is correct |
| 29 |
Correct |
3 ms |
6236 KB |
Output is correct |
| 30 |
Correct |
2 ms |
6236 KB |
Output is correct |
| 31 |
Correct |
2 ms |
6236 KB |
Output is correct |
| 32 |
Correct |
2 ms |
6236 KB |
Output is correct |
| 33 |
Correct |
6 ms |
8540 KB |
Output is correct |
| 34 |
Correct |
6 ms |
8540 KB |
Output is correct |
| 35 |
Correct |
16 ms |
8572 KB |
Output is correct |
| 36 |
Correct |
7 ms |
8536 KB |
Output is correct |
| 37 |
Correct |
7 ms |
8540 KB |
Output is correct |
| 38 |
Correct |
20 ms |
8612 KB |
Output is correct |
| 39 |
Correct |
8 ms |
8540 KB |
Output is correct |
| 40 |
Correct |
8 ms |
8540 KB |
Output is correct |
| 41 |
Correct |
26 ms |
8660 KB |
Output is correct |
| 42 |
Correct |
9 ms |
8536 KB |
Output is correct |
| 43 |
Correct |
11 ms |
8540 KB |
Output is correct |
| 44 |
Correct |
38 ms |
8540 KB |
Output is correct |
| 45 |
Correct |
10 ms |
8792 KB |
Output is correct |
| 46 |
Correct |
11 ms |
8540 KB |
Output is correct |
| 47 |
Correct |
40 ms |
8540 KB |
Output is correct |
| 48 |
Correct |
11 ms |
8792 KB |
Output is correct |
| 49 |
Correct |
11 ms |
8824 KB |
Output is correct |
| 50 |
Correct |
52 ms |
8796 KB |
Output is correct |
| 51 |
Correct |
14 ms |
8792 KB |
Output is correct |
| 52 |
Correct |
16 ms |
8792 KB |
Output is correct |
| 53 |
Correct |
54 ms |
10840 KB |
Output is correct |
| 54 |
Correct |
15 ms |
9048 KB |
Output is correct |
| 55 |
Correct |
15 ms |
8796 KB |
Output is correct |
| 56 |
Correct |
62 ms |
10992 KB |
Output is correct |
| 57 |
Correct |
17 ms |
8792 KB |
Output is correct |
| 58 |
Correct |
18 ms |
8796 KB |
Output is correct |
| 59 |
Correct |
90 ms |
11072 KB |
Output is correct |
| 60 |
Correct |
20 ms |
11096 KB |
Output is correct |
| 61 |
Correct |
21 ms |
11100 KB |
Output is correct |
| 62 |
Correct |
94 ms |
11144 KB |
Output is correct |
| 63 |
Correct |
79 ms |
11144 KB |
Output is correct |
| 64 |
Correct |
146 ms |
11096 KB |
Output is correct |
| 65 |
Correct |
112 ms |
11148 KB |
Output is correct |
| 66 |
Correct |
100 ms |
11144 KB |
Output is correct |
| 67 |
Correct |
87 ms |
11096 KB |
Output is correct |
| 68 |
Correct |
42 ms |
11096 KB |
Output is correct |
| 69 |
Correct |
40 ms |
11160 KB |
Output is correct |
| 70 |
Correct |
32 ms |
11096 KB |
Output is correct |
| 71 |
Correct |
37 ms |
11096 KB |
Output is correct |
| 72 |
Correct |
27 ms |
11168 KB |
Output is correct |
| 73 |
Correct |
28 ms |
11096 KB |
Output is correct |
| 74 |
Correct |
55 ms |
11160 KB |
Output is correct |
| 75 |
Correct |
53 ms |
11420 KB |
Output is correct |
| 76 |
Correct |
44 ms |
11148 KB |
Output is correct |
| 77 |
Correct |
45 ms |
11100 KB |
Output is correct |
| 78 |
Correct |
72 ms |
11096 KB |
Output is correct |
| 79 |
Correct |
37 ms |
11100 KB |
Output is correct |
| 80 |
Correct |
44 ms |
11100 KB |
Output is correct |
| 81 |
Correct |
52 ms |
11100 KB |
Output is correct |
| 82 |
Correct |
45 ms |
11148 KB |
Output is correct |
| 83 |
Correct |
58 ms |
11100 KB |
Output is correct |
| 84 |
Correct |
52 ms |
11156 KB |
Output is correct |
| 85 |
Correct |
63 ms |
11100 KB |
Output is correct |
| 86 |
Correct |
53 ms |
11100 KB |
Output is correct |
| 87 |
Correct |
60 ms |
11096 KB |
Output is correct |
| 88 |
Correct |
62 ms |
11100 KB |
Output is correct |
| 89 |
Correct |
74 ms |
11096 KB |
Output is correct |
| 90 |
Correct |
63 ms |
11100 KB |
Output is correct |
| 91 |
Correct |
57 ms |
11144 KB |
Output is correct |
| 92 |
Correct |
63 ms |
11100 KB |
Output is correct |
