oj.uz

Submission #998324

# Submission time Handle Problem Language Result Execution time Memory
998324 2024-06-13T15:45:44 Z AtinaR Mecho (IOI09_mecho) C++14
54 / 100
 126 ms 11908 KB 
#include <bits/stdc++.h>

using namespace std;
const long long MAX=810;
long long n,s;
char mat[MAX][MAX];
long long si,sj,ei,ej;
long long di[4]= {0,0,-1,1};
long long dj[4]= {1,-1,0,0};
vector<pair<long long,long long> > hives;
long long distmecho[MAX][MAX];
long long occupied[MAX][MAX];
bool canspreadhive(long long i, long long j)
{
    if(i<0 || i>=n || j<0 || j>=n || occupied[i][j]!=-1 || mat[i][j]=='T' || mat[i][j]=='D')return false;
    return true;
}
void spread_hives()
{
    memset(occupied,-1,sizeof(occupied));
    queue<pair<long long,long long> > q;
    for(auto x:hives)
    {
        q.push(x);
        occupied[x.first][x.second]=0;
    }
    while(!q.empty())
    {
        auto curr=q.front();
        q.pop();
        for(long long k=0; k<4; k++)
        {
            long long newi=curr.first+di[k];
            long long newj=curr.second+dj[k];
            if(!canspreadhive(newi,newj))continue;
            occupied[newi][newj]=occupied[curr.first][curr.second]+1;
            q.push({newi,newj});
        }
    }
}
bool canmechostep(long long i, long long j)
{
    if(i<0 || i>=n || j<0 || j>=n || distmecho[i][j]!=-1 || mat[i][j]=='H' || mat[i][j]=='T')return false;
    return true;
}
bool can_stay(long long X)
{
    memset(distmecho,-1,sizeof(distmecho));
    distmecho[si][sj]=0;
    queue<pair<long long,long long> > q;
    q.push({si,sj});
    if(occupied[si][sj]<=X)return false;
    while(!q.empty())
    {
        auto curr=q.front();
        q.pop();
        for(long long k=0; k<4; k++)
        {
            long long newi=curr.first+di[k];
            long long newj=curr.second+dj[k];
            if(!canmechostep(newi,newj))continue;
            long long newtime=distmecho[curr.first][curr.second]+1;
            long long tmp=newtime;
            long long use=tmp/s+X;
            if(tmp%s)use++;
            if(newi==ei && newj==ej)return true;
            if(use<=occupied[newi][newj])
            {
                distmecho[newi][newj]=newtime;
                q.push({newi,newj});
            }
        }
    }
    if(distmecho[ei][ej]!=-1)return true;
    else return false;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin>>n>>s;
    for(long long i=0; i<n; i++)
    {
        for(long long j=0; j<n; j++)
        {
            cin>>mat[i][j];
            if(mat[i][j]=='M')
            {
                si=i;
                sj=j;
            }
            else if(mat[i][j]=='D')
            {
                ei=i;
                ej=j;
            }
            else if(mat[i][j]=='H')
            {
                hives.push_back({i,j});
            }
        }
    }
    spread_hives();
    long long B=0,E=1e6;
    long long res=-1;
    while(B<=E)
    {
        long long mid=(B+E)/2;
        if(can_stay(mid))
        {
            res=mid;
            B=mid+1;
        }
        else
        {
            E=mid-1;
        }
    }
    cout<<res<<endl;
    return 0;
}

Subtask #1
54.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 4 ms 10844 KB Output isn't correct
2 Incorrect 5 ms 11000 KB Output isn't correct
3 Incorrect 4 ms 10764 KB Output isn't correct
4 Incorrect 4 ms 11256 KB Output isn't correct
5 Correct 4 ms 10844 KB Output is correct
6 Correct 4 ms 10844 KB Output is correct
7 Correct 64 ms 11404 KB Output is correct
8 Incorrect 4 ms 10844 KB Output isn't correct
9 Correct 4 ms 10844 KB Output is correct
10 Correct 4 ms 11000 KB Output is correct
11 Correct 4 ms 10844 KB Output is correct
12 Correct 4 ms 10844 KB Output is correct
13 Correct 5 ms 10844 KB Output is correct
14 Correct 4 ms 10844 KB Output is correct
15 Incorrect 3 ms 10844 KB Output isn't correct
16 Correct 5 ms 10844 KB Output is correct
17 Incorrect 4 ms 10844 KB Output isn't correct
18 Correct 4 ms 10844 KB Output is correct
19 Incorrect 4 ms 10844 KB Output isn't correct
20 Correct 3 ms 10844 KB Output is correct
21 Incorrect 3 ms 10844 KB Output isn't correct
22 Correct 4 ms 10844 KB Output is correct
23 Incorrect 4 ms 10844 KB Output isn't correct
24 Correct 3 ms 10896 KB Output is correct
25 Incorrect 4 ms 10892 KB Output isn't correct
26 Correct 3 ms 10844 KB Output is correct
27 Incorrect 3 ms 10844 KB Output isn't correct
28 Correct 3 ms 10896 KB Output is correct
29 Incorrect 5 ms 10892 KB Output isn't correct
30 Correct 4 ms 10844 KB Output is correct
31 Incorrect 4 ms 10844 KB Output isn't correct
32 Correct 5 ms 10844 KB Output is correct
33 Incorrect 6 ms 10844 KB Output isn't correct
34 Correct 6 ms 10844 KB Output is correct
35 Correct 19 ms 11016 KB Output is correct
36 Incorrect 7 ms 11044 KB Output isn't correct
37 Correct 6 ms 10964 KB Output is correct
38 Correct 26 ms 11052 KB Output is correct
39 Incorrect 10 ms 10844 KB Output isn't correct
40 Correct 9 ms 10844 KB Output is correct
41 Correct 31 ms 11100 KB Output is correct
42 Incorrect 9 ms 10928 KB Output isn't correct
43 Correct 9 ms 11124 KB Output is correct
44 Correct 36 ms 11096 KB Output is correct
45 Incorrect 8 ms 11164 KB Output isn't correct
46 Correct 9 ms 10960 KB Output is correct
47 Correct 55 ms 11156 KB Output is correct
48 Incorrect 9 ms 11100 KB Output isn't correct
49 Correct 12 ms 11164 KB Output is correct
50 Correct 48 ms 11224 KB Output is correct
51 Incorrect 11 ms 11096 KB Output isn't correct
52 Correct 10 ms 11244 KB Output is correct
53 Correct 60 ms 11244 KB Output is correct
54 Incorrect 14 ms 11288 KB Output isn't correct
55 Correct 12 ms 11096 KB Output is correct
56 Correct 91 ms 11100 KB Output is correct
57 Incorrect 13 ms 11100 KB Output isn't correct
58 Correct 13 ms 11340 KB Output is correct
59 Correct 75 ms 11352 KB Output is correct
60 Incorrect 17 ms 11360 KB Output isn't correct
61 Correct 18 ms 11380 KB Output is correct
62 Correct 126 ms 11376 KB Output is correct
63 Correct 80 ms 11364 KB Output is correct
64 Correct 125 ms 11364 KB Output is correct
65 Correct 113 ms 11356 KB Output is correct
66 Incorrect 106 ms 11352 KB Output isn't correct
67 Correct 82 ms 11352 KB Output is correct
68 Correct 42 ms 11432 KB Output is correct
69 Correct 39 ms 11436 KB Output is correct
70 Correct 44 ms 11172 KB Output is correct
71 Correct 30 ms 11168 KB Output is correct
72 Correct 27 ms 11172 KB Output is correct
73 Correct 31 ms 11752 KB Output is correct
74 Correct 51 ms 11592 KB Output is correct
75 Correct 64 ms 11704 KB Output is correct
76 Correct 55 ms 11708 KB Output is correct
77 Correct 60 ms 11708 KB Output is correct
78 Correct 58 ms 11780 KB Output is correct
79 Correct 53 ms 11888 KB Output is correct
80 Correct 48 ms 11860 KB Output is correct
81 Correct 54 ms 11640 KB Output is correct
82 Correct 49 ms 11908 KB Output is correct
83 Correct 66 ms 11764 KB Output is correct
84 Correct 64 ms 11824 KB Output is correct
85 Correct 66 ms 11556 KB Output is correct
86 Correct 62 ms 11828 KB Output is correct
87 Correct 70 ms 11820 KB Output is correct
88 Correct 62 ms 11600 KB Output is correct
89 Correct 63 ms 11612 KB Output is correct
90 Correct 96 ms 11448 KB Output is correct
91 Correct 65 ms 11448 KB Output is correct
92 Correct 60 ms 11648 KB Output is correct