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Submission #244303

# Submission time Handle Problem Language Result Execution time Memory
244303 2020-07-03T14:59:04 Z JovanK26 Mecho (IOI09_mecho) C++14
100 / 100
 297 ms 5240 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+1)/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+1)/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+1)/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+1)/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]=0;
               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(cur.x==home.x && cur.y==home.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
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 4 ms 384 KB Output is correct
4 Correct 7 ms 384 KB Output is correct
5 Correct 4 ms 384 KB Output is correct
6 Correct 5 ms 384 KB Output is correct
7 Correct 73 ms 4864 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 512 KB Output is correct
12 Correct 5 ms 768 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 512 KB Output is correct
17 Correct 5 ms 512 KB Output is correct
18 Correct 6 ms 512 KB Output is correct
19 Correct 5 ms 512 KB Output is correct
20 Correct 7 ms 512 KB Output is correct
21 Correct 5 ms 512 KB Output is correct
22 Correct 7 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 5 ms 640 KB Output is correct
27 Correct 6 ms 768 KB Output is correct
28 Correct 5 ms 640 KB Output is correct
29 Correct 5 ms 768 KB Output is correct
30 Correct 5 ms 768 KB Output is correct
31 Correct 5 ms 768 KB Output is correct
32 Correct 5 ms 768 KB Output is correct
33 Correct 10 ms 2304 KB Output is correct
34 Correct 9 ms 2304 KB Output is correct
35 Correct 21 ms 2304 KB Output is correct
36 Correct 21 ms 2560 KB Output is correct
37 Correct 14 ms 2560 KB Output is correct
38 Correct 25 ms 2560 KB Output is correct
39 Correct 25 ms 2816 KB Output is correct
40 Correct 12 ms 2816 KB Output is correct
41 Correct 31 ms 2816 KB Output is correct
42 Correct 15 ms 3072 KB Output is correct
43 Correct 14 ms 3072 KB Output is correct
44 Correct 40 ms 3072 KB Output is correct
45 Correct 16 ms 3328 KB Output is correct
46 Correct 16 ms 3456 KB Output is correct
47 Correct 45 ms 3456 KB Output is correct
48 Correct 19 ms 3584 KB Output is correct
49 Correct 30 ms 3584 KB Output is correct
50 Correct 58 ms 3704 KB Output is correct
51 Correct 21 ms 3968 KB Output is correct
52 Correct 19 ms 3968 KB Output is correct
53 Correct 62 ms 3968 KB Output is correct
54 Correct 23 ms 4224 KB Output is correct
55 Correct 23 ms 4224 KB Output is correct
56 Correct 79 ms 4224 KB Output is correct
57 Correct 26 ms 4480 KB Output is correct
58 Correct 24 ms 4480 KB Output is correct
59 Correct 89 ms 4480 KB Output is correct
60 Correct 28 ms 4736 KB Output is correct
61 Correct 26 ms 4736 KB Output is correct
62 Correct 92 ms 4736 KB Output is correct
63 Correct 101 ms 4728 KB Output is correct
64 Correct 297 ms 4728 KB Output is correct
65 Correct 142 ms 4788 KB Output is correct
66 Correct 136 ms 4704 KB Output is correct
67 Correct 119 ms 4732 KB Output is correct
68 Correct 56 ms 4760 KB Output is correct
69 Correct 60 ms 4728 KB Output is correct
70 Correct 48 ms 4728 KB Output is correct
71 Correct 43 ms 4728 KB Output is correct
72 Correct 49 ms 4856 KB Output is correct
73 Correct 41 ms 5112 KB Output is correct
74 Correct 57 ms 5120 KB Output is correct
75 Correct 63 ms 5240 KB Output is correct
76 Correct 57 ms 5120 KB Output is correct
77 Correct 66 ms 5240 KB Output is correct
78 Correct 71 ms 5120 KB Output is correct
79 Correct 55 ms 5112 KB Output is correct
80 Correct 59 ms 5120 KB Output is correct
81 Correct 64 ms 5112 KB Output is correct
82 Correct 56 ms 5240 KB Output is correct
83 Correct 72 ms 4984 KB Output is correct
84 Correct 61 ms 4984 KB Output is correct
85 Correct 65 ms 4980 KB Output is correct
86 Correct 74 ms 4984 KB Output is correct
87 Correct 70 ms 5108 KB Output is correct
88 Correct 88 ms 4992 KB Output is correct
89 Correct 72 ms 4992 KB Output is correct
90 Correct 83 ms 4984 KB Output is correct
91 Correct 78 ms 4992 KB Output is correct
92 Correct 80 ms 4992 KB Output is correct