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Submission #244274

# Submission time Handle Problem Language Result Execution time Memory
244274 2020-07-03T13:06:29 Z JovanK26 Mecho (IOI09_mecho) C++14
49 / 100
 157 ms 5248 KB 
#include <bits/stdc++.h>

using namespace std;
int n,s;
bool is[801][801];
int tim[801][801];
bool vis[801][801];
struct field
{
    int x,y;
};
vector<field> hives;
field start;
field home;
bool check(int m)
{
     bool visited[801][801];
     for(int i=0;i<n;i++)
     {
         for(int j=0;j<n;j++)
         {
             visited[i][j]=0;
         }
     }
     if(m>=tim[start.x][start.y])return 0;
     queue<pair<field,int> > q;
     q.push(make_pair(start,0));
     while(!q.empty())
    {
        auto x=q.front();
        q.pop();
        field cur=x.first;
        if(cur.x==home.x && cur.y==home.y)return 1;
        int d=x.second;
        visited[cur.x][cur.y]=1;
        if(cur.x+1<n && !visited[cur.x+1][cur.y] && is[cur.x+1][cur.y] && m+d/s<tim[cur.x+1][cur.y])
        {
            cur.x++;
            visited[cur.x][cur.y]=1;
            q.push(make_pair(cur,d+1));
            cur.x--;
        }
        if(cur.x-1>=0 && !visited[cur.x-1][cur.y] && is[cur.x-1][cur.y] && m+d/s<tim[cur.x-1][cur.y])
        {
            cur.x--;
            visited[cur.x][cur.y]=1;
            q.push(make_pair(cur,d+1));
            cur.x++;
        }
        if(cur.y+1<n && !visited[cur.x][cur.y+1] && is[cur.x][cur.y+1] && m+d/s<tim[cur.x][cur.y+1])
        {
            cur.y++;
            visited[cur.x][cur.y]=1;
            q.push(make_pair(cur,d+1));
            cur.y--;
        }
        if(cur.y-1>=0 && !visited[cur.x][cur.y-1] && is[cur.x][cur.y-1] && m+d/s<tim[cur.x][cur.y-1])
        {
            cur.y--;
            visited[cur.x][cur.y]=1;
            q.push(make_pair(cur,d+1));
            cur.y++;
        }
    }
    return 0;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> s;
    char c;
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<n;j++)
        {
           cin >> c;
           if(c=='T')
           {
               is[i][j]=0;
           }
           else if(c=='M')
           {
               is[i][j]=1;
               start.x=i;
               start.y=j;
           }
           else if(c=='D')
           {
               is[i][j]=1;
               home.x=i;
               home.y=j;
           }
           else if(c=='H')
           {
               is[i][j]=1;
               field temp;
               temp.x=i;
               temp.y=j;
               hives.push_back(temp);
           }
           else
           {
               is[i][j]=1;
           }
        }
    }
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<n;j++)
        {
            tim[i][j]=1000000000;
        }
    }
    queue<pair<field,int> > q;
    for(int i=0;i<hives.size();i++)
    {
        q.push(make_pair(hives[i],0));
        vis[hives[i].x][hives[i].y]=1;
    }
    while(!q.empty())
    {
        auto x=q.front();
        q.pop();
        field cur=x.first;
        int d=x.second;
        //if(vis[cur.x][cur.y])continue;
        vis[cur.x][cur.y]=1;
        tim[cur.x][cur.y]=min(tim[cur.x][cur.y],d);
        if(cur.x+1<n && !vis[cur.x+1][cur.y] && is[cur.x+1][cur.y])
        {
            cur.x++;
            vis[cur.x][cur.y]=1;
            q.push(make_pair(cur,d+1));
            cur.x--;
        }
        if(cur.x-1>=0 && !vis[cur.x-1][cur.y] && is[cur.x-1][cur.y])
        {
            cur.x--;
            vis[cur.x][cur.y]=1;
            q.push(make_pair(cur,d+1));
            cur.x++;
        }
        if(cur.y+1<n && !vis[cur.x][cur.y+1] && is[cur.x][cur.y+1])
        {
            cur.y++;
            vis[cur.x][cur.y]=1;
            q.push(make_pair(cur,d+1));
            cur.y--;
        }
        if(cur.y-1>=0 && !vis[cur.x][cur.y-1] && is[cur.x][cur.y-1])
        {
            cur.y--;
            vis[cur.x][cur.y]=1;
            q.push(make_pair(cur,d+1));
            cur.y++;
        }
    }
    tim[home.x][home.y]=1000000000;
    int l=0;
    int r=1000000;
    int m;
    int rez=-1;
    while(l<r)
    {
        m=(l+r)/2;
        if(check(m))
        {
            l=m+1;
            rez=max(rez,m);
        }
        else
        {
            r=m;
        }
    }
    cout << rez;
    return 0;
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:117:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<hives.size();i++)
                 ~^~~~~~~~~~~~~

Subtask #1
49.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 5 ms 384 KB Output isn't correct
2 Incorrect 5 ms 384 KB Output isn't correct
3 Incorrect 4 ms 384 KB Output isn't correct
4 Incorrect 4 ms 384 KB Output isn't correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 4 ms 384 KB Output is correct
7 Correct 75 ms 4864 KB Output is correct
8 Incorrect 5 ms 416 KB Output isn't correct
9 Correct 5 ms 384 KB Output is correct
10 Correct 5 ms 512 KB Output is correct
11 Correct 5 ms 512 KB Output is correct
12 Incorrect 5 ms 640 KB Output isn't correct
13 Correct 5 ms 640 KB Output is correct
14 Correct 5 ms 640 KB Output is correct
15 Incorrect 4 ms 512 KB Output isn't correct
16 Correct 5 ms 512 KB Output is correct
17 Incorrect 5 ms 512 KB Output isn't correct
18 Correct 4 ms 512 KB Output is correct
19 Incorrect 5 ms 512 KB Output isn't correct
20 Correct 5 ms 512 KB Output is correct
21 Incorrect 5 ms 512 KB Output isn't correct
22 Correct 6 ms 512 KB Output is correct
23 Incorrect 5 ms 640 KB Output isn't correct
24 Correct 6 ms 640 KB Output is correct
25 Incorrect 5 ms 640 KB Output isn't correct
26 Correct 5 ms 640 KB Output is correct
27 Incorrect 5 ms 688 KB Output isn't correct
28 Correct 5 ms 640 KB Output is correct
29 Incorrect 5 ms 768 KB Output isn't correct
30 Correct 5 ms 768 KB Output is correct
31 Incorrect 5 ms 768 KB Output isn't correct
32 Correct 5 ms 768 KB Output is correct
33 Incorrect 10 ms 2304 KB Output isn't correct
34 Correct 10 ms 2304 KB Output is correct
35 Correct 20 ms 2304 KB Output is correct
36 Incorrect 11 ms 2560 KB Output isn't correct
37 Correct 11 ms 2560 KB Output is correct
38 Correct 25 ms 2560 KB Output is correct
39 Incorrect 13 ms 2816 KB Output isn't correct
40 Correct 13 ms 2816 KB Output is correct
41 Correct 31 ms 2816 KB Output is correct
42 Incorrect 15 ms 3072 KB Output isn't correct
43 Correct 14 ms 3072 KB Output is correct
44 Correct 39 ms 3072 KB Output is correct
45 Incorrect 17 ms 3328 KB Output isn't correct
46 Correct 20 ms 3328 KB Output is correct
47 Correct 46 ms 3328 KB Output is correct
48 Incorrect 20 ms 3584 KB Output isn't correct
49 Correct 18 ms 3584 KB Output is correct
50 Correct 53 ms 3584 KB Output is correct
51 Incorrect 21 ms 3968 KB Output isn't correct
52 Correct 20 ms 3968 KB Output is correct
53 Correct 62 ms 3968 KB Output is correct
54 Incorrect 27 ms 4224 KB Output isn't correct
55 Correct 23 ms 4216 KB Output is correct
56 Correct 72 ms 4224 KB Output is correct
57 Incorrect 29 ms 4480 KB Output isn't correct
58 Correct 25 ms 4480 KB Output is correct
59 Correct 98 ms 4472 KB Output is correct
60 Incorrect 31 ms 4736 KB Output isn't correct
61 Correct 26 ms 4856 KB Output is correct
62 Correct 94 ms 4736 KB Output is correct
63 Correct 101 ms 4728 KB Output is correct
64 Correct 157 ms 4728 KB Output is correct
65 Correct 144 ms 4728 KB Output is correct
66 Incorrect 124 ms 4728 KB Output isn't correct
67 Correct 112 ms 4728 KB Output is correct
68 Correct 54 ms 4728 KB Output is correct
69 Correct 55 ms 4728 KB Output is correct
70 Correct 48 ms 4856 KB Output is correct
71 Correct 43 ms 4728 KB Output is correct
72 Correct 42 ms 4728 KB Output is correct
73 Correct 37 ms 5120 KB Output is correct
74 Correct 56 ms 5248 KB Output is correct
75 Correct 63 ms 5216 KB Output is correct
76 Correct 57 ms 5120 KB Output is correct
77 Correct 60 ms 5116 KB Output is correct
78 Correct 73 ms 5164 KB Output is correct
79 Correct 54 ms 5112 KB Output is correct
80 Correct 59 ms 5112 KB Output is correct
81 Correct 64 ms 5096 KB Output is correct
82 Correct 58 ms 5240 KB Output is correct
83 Correct 69 ms 4976 KB Output is correct
84 Correct 62 ms 4976 KB Output is correct
85 Correct 62 ms 4984 KB Output is correct
86 Correct 67 ms 4984 KB Output is correct
87 Correct 69 ms 4976 KB Output is correct
88 Correct 70 ms 4984 KB Output is correct
89 Correct 73 ms 4992 KB Output is correct
90 Correct 78 ms 4984 KB Output is correct
91 Correct 72 ms 4992 KB Output is correct
92 Correct 77 ms 4992 KB Output is correct