oj.uz

Submission #916359

# Submission time Handle Problem Language Result Execution time Memory
916359 2024-01-25T18:06:19 Z codefox Mecho (IOI09_mecho) C++14
100 / 100
 269 ms 54284 KB 
#include<bits/stdc++.h>

using namespace std;


#define pii pair<int, int>
#define piipi pair<pii, int>

int N = 1e6;

int main()
{
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);

    int n, s;
    cin >> n >> s;
    vector<string> grid(n+2);
    string ns = "";
    for (int i = 0; i < n+2; i++) ns += "T";
    grid[0] = ns;
    grid[n+1] = ns;
    for (int i = 1; i <= n; i++) 
    {
        cin >> grid[i];
        grid[i] = "T" + grid[i] + "T";
    }

    vector<vector<int>> graph(N);
    queue<pii> q;
    int home = -1;
    int mecho = -1;
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= n; j++)
        {
            int ind = i*(n+2) +j;
            if (grid[i][j]=='H') q.push({0, ind});
            if (grid[i][j]=='D') home = ind;
            if (grid[i][j]=='M') 
            {
                mecho = ind;   
                graph[ind-1].push_back(ind);
                graph[ind+1].push_back(ind);
                graph[ind+n+2].push_back(ind);
                graph[ind-n-2].push_back(ind);
            }
            if (grid[i][j-1]=='G') graph[ind].push_back(ind-1);
            if (grid[i][j+1]=='G') graph[ind].push_back(ind+1);
            if (grid[i+1][j]=='G') graph[ind].push_back(ind+n+2);
            if (grid[i-1][j]=='G') graph[ind].push_back(ind-n-2);
        }
    }

    vector<int> dist(N, -1);
    while (q.size())
    {
        int i, d;
        tie(d, i) = q.front();
        q.pop();
        if (dist[i]!=-1) continue;
        dist[i] = d;
        for (int ele:graph[i])
        {
            q.push({d+1, ele});
        }
    }

    priority_queue<pii, vector<pii>, less<pii>> toadd;
    vector<int> reach(N, 0);
    toadd.push({N, home});
    for (int i = N-1; i >= 0; i--)
    {
        while(toadd.size() && toadd.top().first >= i)
        {
            q.push({0, toadd.top().second});
            toadd.pop();
        }
        while (q.size())
        {
            int j, d;
            tie(d, j) = q.front();
            q.pop();
            if (reach[j]==1) continue;
            reach[j] = 1;
            for (int ele:graph[j])
            {
                if (dist[ele]>=i && d+1 < s) q.push({d+1, ele});
                else toadd.push({dist[ele], ele});
            }
        }
        if (reach[mecho])
        {
            cout << i-1;
            return 0;
        }
    }
    cout << -1;
    return 0;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 31576 KB Output is correct
2 Correct 13 ms 31580 KB Output is correct
3 Correct 14 ms 31576 KB Output is correct
4 Correct 14 ms 31580 KB Output is correct
5 Correct 13 ms 31580 KB Output is correct
6 Correct 14 ms 31576 KB Output is correct
7 Correct 228 ms 53456 KB Output is correct
8 Correct 13 ms 31580 KB Output is correct
9 Correct 14 ms 31580 KB Output is correct
10 Correct 13 ms 31768 KB Output is correct
11 Correct 13 ms 31580 KB Output is correct
12 Correct 13 ms 31888 KB Output is correct
13 Correct 14 ms 31832 KB Output is correct
14 Correct 15 ms 31832 KB Output is correct
15 Correct 13 ms 31580 KB Output is correct
16 Correct 13 ms 31580 KB Output is correct
17 Correct 12 ms 31580 KB Output is correct
18 Correct 13 ms 31784 KB Output is correct
19 Correct 13 ms 31580 KB Output is correct
20 Correct 13 ms 31580 KB Output is correct
21 Correct 14 ms 31580 KB Output is correct
22 Correct 12 ms 31580 KB Output is correct
23 Correct 13 ms 31836 KB Output is correct
24 Correct 16 ms 31844 KB Output is correct
25 Correct 13 ms 31836 KB Output is correct
26 Correct 13 ms 31836 KB Output is correct
27 Correct 14 ms 31904 KB Output is correct
28 Correct 13 ms 31836 KB Output is correct
29 Correct 14 ms 31836 KB Output is correct
30 Correct 14 ms 31832 KB Output is correct
31 Correct 15 ms 31832 KB Output is correct
32 Correct 15 ms 31836 KB Output is correct
33 Correct 30 ms 35676 KB Output is correct
34 Correct 25 ms 35780 KB Output is correct
35 Correct 51 ms 35672 KB Output is correct
36 Correct 30 ms 37024 KB Output is correct
37 Correct 33 ms 36956 KB Output is correct
38 Correct 42 ms 36944 KB Output is correct
39 Correct 37 ms 38488 KB Output is correct
40 Correct 38 ms 38312 KB Output is correct
41 Correct 53 ms 38428 KB Output is correct
42 Correct 39 ms 40020 KB Output is correct
43 Correct 38 ms 40024 KB Output is correct
44 Correct 81 ms 40016 KB Output is correct
45 Correct 43 ms 41812 KB Output is correct
46 Correct 48 ms 41976 KB Output is correct
47 Correct 89 ms 41856 KB Output is correct
48 Correct 51 ms 43668 KB Output is correct
49 Correct 50 ms 43600 KB Output is correct
50 Correct 116 ms 43688 KB Output is correct
51 Correct 60 ms 45840 KB Output is correct
52 Correct 55 ms 45824 KB Output is correct
53 Correct 128 ms 45652 KB Output is correct
54 Correct 62 ms 48044 KB Output is correct
55 Correct 62 ms 47952 KB Output is correct
56 Correct 166 ms 48064 KB Output is correct
57 Correct 70 ms 50260 KB Output is correct
58 Correct 70 ms 50260 KB Output is correct
59 Correct 207 ms 50696 KB Output is correct
60 Correct 79 ms 53076 KB Output is correct
61 Correct 79 ms 53004 KB Output is correct
62 Correct 231 ms 53104 KB Output is correct
63 Correct 195 ms 52972 KB Output is correct
64 Correct 152 ms 52700 KB Output is correct
65 Correct 160 ms 52784 KB Output is correct
66 Correct 187 ms 53012 KB Output is correct
67 Correct 202 ms 52788 KB Output is correct
68 Correct 140 ms 52836 KB Output is correct
69 Correct 139 ms 52684 KB Output is correct
70 Correct 135 ms 52820 KB Output is correct
71 Correct 136 ms 52844 KB Output is correct
72 Correct 127 ms 52820 KB Output is correct
73 Correct 261 ms 54284 KB Output is correct
74 Correct 215 ms 54108 KB Output is correct
75 Correct 238 ms 54156 KB Output is correct
76 Correct 245 ms 54032 KB Output is correct
77 Correct 217 ms 54096 KB Output is correct
78 Correct 269 ms 53976 KB Output is correct
79 Correct 192 ms 53840 KB Output is correct
80 Correct 208 ms 53968 KB Output is correct
81 Correct 226 ms 54060 KB Output is correct
82 Correct 208 ms 53880 KB Output is correct
83 Correct 241 ms 53840 KB Output is correct
84 Correct 206 ms 53836 KB Output is correct
85 Correct 199 ms 53904 KB Output is correct
86 Correct 206 ms 53792 KB Output is correct
87 Correct 219 ms 53768 KB Output is correct
88 Correct 255 ms 53716 KB Output is correct
89 Correct 199 ms 53588 KB Output is correct
90 Correct 236 ms 53628 KB Output is correct
91 Correct 198 ms 53584 KB Output is correct
92 Correct 233 ms 53652 KB Output is correct