| # |
Submission time |
Handle |
Problem |
Language |
Result |
Execution time |
Memory |
| 948097 |
2024-03-17T15:15:58 Z |
packmani |
Mecho (IOI09_mecho) |
C++14 |
|
140 ms |
7264 KB |
#include<bits/stdc++.h>
using namespace std;
#define int long long int
int n,speed;
char inp[805][805];
int board[805][805];
bool visited[805][805];
queue<pair<int,int>> q;
pair<int,int> s,e;
int cr,cc,er,ec;
int dr[]={0,-1,0,1};
int dc[]={1,0,-1,0};
int maxTime=0;
int l,m,r;
int layer,tillNext,inNext;
void printBoard()
{
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
cout << board[i][j] << ' ';
}
cout << '\n';
}
cout << '\n';
}
bool bfs(int start)
{
queue<pair<int,int>> tempq;
memset(visited,0,sizeof(visited));
int time=start;
tempq.push({s.first,s.second});
tillNext=1;
inNext=0;
layer=0;
while(!tempq.empty())
{
cr = tempq.front().first;
cc = tempq.front().second;
tempq.pop();
if(board[cr][cc]>time or inp[cr][cc]=='M')//bees have not reached this spot yet
{
//cout << time;
for(int i=0;i<4;i++)
{
er = cr + dr[i];
ec = cc + dc[i];
if(er<0 or ec<0 or er>=n or ec>=n) continue;
if(inp[er][ec]=='D') return 1;
if(visited[er][ec]) continue;
if(board[er][ec]==-1) continue;
if(board[er][ec]<=time) continue;
tempq.push({er,ec});
visited[er][ec]=1;
inNext++;
}
}
tillNext--;
if(tillNext==0)
{
tillNext = inNext;
inNext = 0;
layer++;
if(layer%speed==0) time++;
}
}
return 0;
}
int32_t main()
{
cin.tie(0); ios_base::sync_with_stdio(false);
cin >> n >> speed;
for(int i=0;i<n;i++)
{
for(int j=0;j<n;j++)
{
cin >> inp[i][j];
if(inp[i][j]=='T') board[i][j]=-1; //no one can traverse
if(inp[i][j]=='H')
{
board[i][j]=0; //not walkable since the 0th sec
q.push({i,j});
}
if(inp[i][j]=='M') s={i,j};
if(inp[i][j]=='D') e={i,j};
if(inp[i][j]=='G') board[i][j] = 1000000;
}
}
//bees
while(!q.empty())
{
cr = q.front().first;
cc = q.front().second;
q.pop();
for(int i=0;i<4;i++)
{
er = cr + dr[i];
ec = cc + dc[i];
if(er<0 or ec<0 or er>=n or ec>=n) continue;
if(board[er][ec]==-1 or board[er][ec]=='D') continue;
if(board[er][ec]<=board[cr][cc]+1) continue;
board[er][ec]=board[cr][cc]+1;
q.push({er,ec});
maxTime=max(maxTime,board[er][ec]);
}
}
//printBoard();
//cout << maxTime;
//b-search answer in range(0,maxTime)
/*for(int i=0;i<=maxTime;i++)
cout << i << ' ';
cout << '\n';
for(int i=0;i<=maxTime;i++)
cout << bfs(i) << ' ';
cout << '\n';*/
l=0;
r=maxTime;
m = l + (r-l)/2;
int best=-1;
while(l<=r)
{
//cout << l << ' ' << r << ' ' << m << '\n';
if(bfs(m)==1)
{
l=m+1;
best = max(best,m);
}
else r=m-1;
m = l + (r+0.5-l)/2;
}
if(m==0 and bfs(0)==0) cout << -1;
else cout << max(best,m);
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 2 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 3 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 4 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 5 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 6 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 7 |
Correct |
60 ms |
7008 KB |
Output is correct |
| 8 |
Correct |
1 ms |
4696 KB |
Output is correct |
| 9 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 10 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 11 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 12 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 13 |
Incorrect |
1 ms |
4700 KB |
Output isn't correct |
| 14 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 15 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 16 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 17 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 18 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 19 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 20 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 21 |
Correct |
1 ms |
4568 KB |
Output is correct |
| 22 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 23 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 24 |
Correct |
1 ms |
4564 KB |
Output is correct |
| 25 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 26 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 27 |
Correct |
1 ms |
4696 KB |
Output is correct |
| 28 |
Correct |
1 ms |
4696 KB |
Output is correct |
| 29 |
Correct |
1 ms |
4696 KB |
Output is correct |
| 30 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 31 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 32 |
Correct |
1 ms |
4700 KB |
Output is correct |
| 33 |
Correct |
4 ms |
6748 KB |
Output is correct |
| 34 |
Correct |
3 ms |
6748 KB |
Output is correct |
| 35 |
Correct |
14 ms |
6804 KB |
Output is correct |
| 36 |
Correct |
4 ms |
6748 KB |
Output is correct |
| 37 |
Correct |
4 ms |
6748 KB |
Output is correct |
| 38 |
Correct |
18 ms |
6800 KB |
Output is correct |
| 39 |
Correct |
7 ms |
6748 KB |
Output is correct |
| 40 |
Correct |
5 ms |
6748 KB |
Output is correct |
| 41 |
Correct |
25 ms |
6748 KB |
Output is correct |
| 42 |
Correct |
6 ms |
6748 KB |
Output is correct |
| 43 |
Correct |
6 ms |
6748 KB |
Output is correct |
| 44 |
Correct |
29 ms |
6808 KB |
Output is correct |
| 45 |
Correct |
7 ms |
6748 KB |
Output is correct |
| 46 |
Correct |
6 ms |
6748 KB |
Output is correct |
| 47 |
Correct |
37 ms |
6580 KB |
Output is correct |
| 48 |
Correct |
7 ms |
6748 KB |
Output is correct |
| 49 |
Correct |
8 ms |
6748 KB |
Output is correct |
| 50 |
Correct |
45 ms |
6744 KB |
Output is correct |
| 51 |
Correct |
8 ms |
6748 KB |
Output is correct |
| 52 |
Correct |
9 ms |
6748 KB |
Output is correct |
| 53 |
Correct |
55 ms |
6792 KB |
Output is correct |
| 54 |
Correct |
10 ms |
6748 KB |
Output is correct |
| 55 |
Correct |
9 ms |
6748 KB |
Output is correct |
| 56 |
Correct |
59 ms |
6784 KB |
Output is correct |
| 57 |
Correct |
11 ms |
6748 KB |
Output is correct |
| 58 |
Correct |
10 ms |
6620 KB |
Output is correct |
| 59 |
Correct |
66 ms |
6792 KB |
Output is correct |
| 60 |
Correct |
12 ms |
6748 KB |
Output is correct |
| 61 |
Correct |
12 ms |
6748 KB |
Output is correct |
| 62 |
Correct |
79 ms |
6640 KB |
Output is correct |
| 63 |
Correct |
94 ms |
6788 KB |
Output is correct |
| 64 |
Correct |
140 ms |
6780 KB |
Output is correct |
| 65 |
Correct |
132 ms |
6736 KB |
Output is correct |
| 66 |
Correct |
97 ms |
6748 KB |
Output is correct |
| 67 |
Correct |
99 ms |
6736 KB |
Output is correct |
| 68 |
Correct |
45 ms |
6836 KB |
Output is correct |
| 69 |
Correct |
33 ms |
6840 KB |
Output is correct |
| 70 |
Correct |
32 ms |
6736 KB |
Output is correct |
| 71 |
Correct |
30 ms |
6688 KB |
Output is correct |
| 72 |
Incorrect |
28 ms |
6744 KB |
Output isn't correct |
| 73 |
Incorrect |
51 ms |
7260 KB |
Output isn't correct |
| 74 |
Correct |
44 ms |
7216 KB |
Output is correct |
| 75 |
Correct |
42 ms |
7264 KB |
Output is correct |
| 76 |
Correct |
45 ms |
7252 KB |
Output is correct |
| 77 |
Correct |
46 ms |
7260 KB |
Output is correct |
| 78 |
Correct |
53 ms |
7260 KB |
Output is correct |
| 79 |
Correct |
34 ms |
7116 KB |
Output is correct |
| 80 |
Correct |
43 ms |
7260 KB |
Output is correct |
| 81 |
Correct |
47 ms |
7132 KB |
Output is correct |
| 82 |
Correct |
38 ms |
7260 KB |
Output is correct |
| 83 |
Correct |
62 ms |
7000 KB |
Output is correct |
| 84 |
Correct |
51 ms |
7004 KB |
Output is correct |
| 85 |
Correct |
45 ms |
7048 KB |
Output is correct |
| 86 |
Correct |
53 ms |
7004 KB |
Output is correct |
| 87 |
Correct |
50 ms |
7012 KB |
Output is correct |
| 88 |
Correct |
59 ms |
7004 KB |
Output is correct |
| 89 |
Correct |
56 ms |
6996 KB |
Output is correct |
| 90 |
Correct |
81 ms |
6952 KB |
Output is correct |
| 91 |
Correct |
65 ms |
7096 KB |
Output is correct |
| 92 |
Correct |
68 ms |
7104 KB |
Output is correct |
