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Submission #399449

# Submission time Handle Problem Language Result Execution time Memory
399449 2021-05-05T20:24:19 Z ruadhan Mecho (IOI09_mecho) C++17
73 / 100
 279 ms 7072 KB 
#include <bits/stdc++.h>
#define sz(x) (int)x.size()
#define x first
#define y second
#define X 0
#define Y 1
#define TIME 2
#define STEPS 3
using namespace std;
typedef pair<int, int> pi;

const int MX = 805;
string grid[MX];
int bees_time[MX][MX];
int N, S;

vector<pi> hives;
vector<pi> dirs = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}};
void calc_bee_times()
{
    queue<pi> q;
    for (auto i : hives)
    {
        q.push(i);
        bees_time[i.x][i.y] = 0;
    }
    while (!q.empty())
    {
        auto curr = q.front();
        q.pop();
        for (auto d : dirs)
        {
            int i = curr.x + d.x, j = curr.y + d.y;
            if (i < 0 || i >= N || j < 0 || j >= N || grid[i][j] == 'T' || bees_time[i][j] != -1)
                continue;
            bees_time[i][j] = bees_time[curr.x][curr.y] + 1;
            q.push({i, j});
        }
    }
}

pi mecho, home;
int processed[MX][MX];
bool ok(int t)
{
    for (int i = 0; i < N; i++)
    {
        for (int j = 0; j < N; j++)
            processed[i][j] = 0;
    }
    queue<array<int, 4>> q;
    processed[mecho.x][mecho.y] = 1;
    q.push({mecho.x, mecho.y, t, 0});
    while (!q.empty())
    {
        auto curr = q.front();
        // cout << "new queue top " << '\n';
        // cout << curr[X] << " " << curr[Y] << " " << curr[TIME] << " " << curr[STEPS] << '\n';
        q.pop();
        for (auto d : dirs)
        {
            int i = curr[X] + d.x, j = curr[Y] + d.y;
            int new_steps = (curr[STEPS] + 1) % S;
            int time = curr[TIME] + (new_steps == 0);
            if (i < 0 || i >= N || j < 0 || j >= N || grid[i][j] == 'T' || bees_time[i][j] <= time || processed[i][j] == 1)
                continue;
            // cout << "we can go to " << i << ", " << j << ", with time = " << time << ", and stps = " << new_steps << '\n';
            processed[i][j] = 1;
            q.push({i, j, time, new_steps});
        }
    }
    return processed[home.x][home.y] == 1;
}

int main()
{
    cin >> N >> S;
    for (int i = 0; i < MX; i++)
        for (int j = 0; j < MX; j++)
            bees_time[i][j] = -1;

    for (int i = 0; i < N; i++)
    {
        cin >> grid[i];
        for (int j = 0; j < N; j++)
        {
            if (grid[i][j] == 'H')
                hives.push_back({i, j});
            else if (grid[i][j] == 'M')
                mecho.x = i, mecho.y = j;
            else if (grid[i][j] == 'D')
                home.x = i, home.y = j;
        }
    }

    calc_bee_times();

    // cout << ok(3) << '\n';

    // for (int i = 0; i < N; i++)
    // {
    //     for (int j = 0; j < N; j++)
    //         cout << bees_time[i][j] << " ";
    //     cout << '\n';
    // }

    int lo = 0, hi = 800 * 800;
    for (int b = hi / 2; b >= 1; b /= 2)
    {
        while (lo + b < hi && ok(lo + b))
            lo += b;
    }

    if (lo == 0 && !ok(0))
        cout << -1 << '\n';
    else
        cout << lo << '\n';

    return 0;
}

Subtask #1
73.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 2764 KB Output is correct
2 Incorrect 2 ms 2764 KB Output isn't correct
3 Correct 2 ms 2860 KB Output is correct
4 Incorrect 2 ms 2764 KB Output isn't correct
5 Correct 2 ms 2764 KB Output is correct
6 Incorrect 2 ms 2892 KB Output isn't correct
7 Incorrect 157 ms 6876 KB Output isn't correct
8 Correct 2 ms 2892 KB Output is correct
9 Correct 2 ms 2892 KB Output is correct
10 Correct 2 ms 2896 KB Output is correct
11 Correct 2 ms 2892 KB Output is correct
12 Incorrect 3 ms 3020 KB Output isn't correct
13 Incorrect 3 ms 3020 KB Output isn't correct
14 Correct 3 ms 3020 KB Output is correct
15 Correct 2 ms 2892 KB Output is correct
16 Correct 2 ms 2896 KB Output is correct
17 Correct 2 ms 2892 KB Output is correct
18 Correct 2 ms 2892 KB Output is correct
19 Correct 2 ms 2892 KB Output is correct
20 Correct 2 ms 2892 KB Output is correct
21 Correct 2 ms 2892 KB Output is correct
22 Correct 2 ms 2892 KB Output is correct
23 Correct 3 ms 3020 KB Output is correct
24 Correct 3 ms 3020 KB Output is correct
25 Correct 3 ms 3020 KB Output is correct
26 Correct 3 ms 3024 KB Output is correct
27 Correct 3 ms 3020 KB Output is correct
28 Correct 3 ms 3020 KB Output is correct
29 Correct 3 ms 3020 KB Output is correct
30 Correct 3 ms 3032 KB Output is correct
31 Correct 3 ms 3020 KB Output is correct
32 Correct 3 ms 3032 KB Output is correct
33 Correct 11 ms 4252 KB Output is correct
34 Correct 11 ms 4172 KB Output is correct
35 Correct 36 ms 4256 KB Output is correct
36 Correct 14 ms 4468 KB Output is correct
37 Correct 16 ms 4404 KB Output is correct
38 Correct 48 ms 4460 KB Output is correct
39 Correct 16 ms 4684 KB Output is correct
40 Correct 18 ms 4700 KB Output is correct
41 Correct 67 ms 4688 KB Output is correct
42 Correct 20 ms 5068 KB Output is correct
43 Correct 20 ms 5116 KB Output is correct
44 Correct 74 ms 5068 KB Output is correct
45 Correct 31 ms 5324 KB Output is correct
46 Correct 27 ms 5320 KB Output is correct
47 Correct 88 ms 5416 KB Output is correct
48 Correct 26 ms 5580 KB Output is correct
49 Correct 29 ms 5720 KB Output is correct
50 Correct 104 ms 5668 KB Output is correct
51 Correct 30 ms 5852 KB Output is correct
52 Correct 32 ms 5808 KB Output is correct
53 Correct 131 ms 5936 KB Output is correct
54 Correct 34 ms 6084 KB Output is correct
55 Correct 36 ms 6220 KB Output is correct
56 Correct 162 ms 6204 KB Output is correct
57 Correct 39 ms 6480 KB Output is correct
58 Correct 56 ms 6424 KB Output is correct
59 Correct 187 ms 6480 KB Output is correct
60 Correct 49 ms 6760 KB Output is correct
61 Correct 54 ms 6696 KB Output is correct
62 Correct 218 ms 6728 KB Output is correct
63 Correct 145 ms 6688 KB Output is correct
64 Correct 279 ms 6824 KB Output is correct
65 Correct 211 ms 6724 KB Output is correct
66 Correct 193 ms 6688 KB Output is correct
67 Correct 186 ms 6768 KB Output is correct
68 Correct 81 ms 6712 KB Output is correct
69 Correct 75 ms 6720 KB Output is correct
70 Correct 63 ms 6720 KB Output is correct
71 Correct 65 ms 6692 KB Output is correct
72 Incorrect 60 ms 6792 KB Output isn't correct
73 Incorrect 57 ms 6984 KB Output isn't correct
74 Correct 102 ms 7012 KB Output is correct
75 Correct 128 ms 7020 KB Output is correct
76 Correct 116 ms 7072 KB Output is correct
77 Correct 133 ms 6988 KB Output is correct
78 Correct 125 ms 7028 KB Output is correct
79 Correct 85 ms 6952 KB Output is correct
80 Correct 117 ms 7032 KB Output is correct
81 Correct 134 ms 6988 KB Output is correct
82 Correct 108 ms 6980 KB Output is correct
83 Correct 126 ms 6932 KB Output is correct
84 Correct 127 ms 6892 KB Output is correct
85 Correct 140 ms 6980 KB Output is correct
86 Correct 134 ms 6960 KB Output is correct
87 Correct 150 ms 6916 KB Output is correct
88 Correct 128 ms 6856 KB Output is correct
89 Correct 150 ms 6852 KB Output is correct
90 Correct 148 ms 6968 KB Output is correct
91 Correct 173 ms 6848 KB Output is correct
92 Correct 141 ms 6896 KB Output is correct