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Submission #1040188

# Submission time Handle Problem Language Result Execution time Memory
1040188 2024-07-31T17:51:35 Z ThommyDB Mecho (IOI09_mecho) C++17
100 / 100
 125 ms 7060 KB 
#include<bits/stdc++.h>

using namespace std;

const int INF = 1e9;

int n, s;
vector<vector<char>> mp;
pair<int, int> m;
vector<vector<int>> bee_dist;
int bear_dist[805][805];
vector<pair<int, int>> allowed_moves{{1, 0}, {-1, 0}, {0, 1}, {0, -1}};

bool check(int eat){
    queue<pair<int, int>> bear;
    memset(bear_dist, -1, sizeof(bear_dist));
    bear_dist[m.first][m.second] = 0;
    bear.push(m);
    while(!bear.empty()){
        pair<int, int> pos = bear.front();
        bear.pop();
        if(bear_dist[pos.first][pos.second]/s + eat >= bee_dist[pos.first][pos.second])continue;

        for(pair<int, int> u : allowed_moves){
            int x = pos.first + u.first, y = pos.second + u.second;
            if(x > 0 && x < n+1 && y > 0 && y < n+1 && mp[x][y]=='D')return true;
            if(bear_dist[x][y]==-1 && x > 0 && x < n+1 && y > 0 && y < n+1 && mp[x][y] != 'D' && mp[x][y] != 'T'){
                bear_dist[x][y]=bear_dist[pos.first][pos.second] + 1;
                bear.push({x, y});
            }
        }
    }
    return false;
}

signed main(){
    cin >> n >> s;
    mp.resize(n+2, vector<char>(n+2));
    bee_dist.resize(n+2, vector<int>(n+2, INF));
    queue<pair<int, int>> bees;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= n; j++){
            cin >> mp[i][j];
            if(mp[i][j]=='M')m={i, j};
            else if(mp[i][j]=='H'){
                bees.push({i, j});
                bee_dist[i][j]=0;
            }
        }  
    }

    while(!bees.empty()){
        pair<int, int> pos = bees.front();
        bees.pop();
        for(pair<int, int> u : allowed_moves){
            int x = pos.first+u.first, y = pos.second+u.second;
            if(bee_dist[x][y]==INF && x > 0 && x < n+1 && y > 0 && y < n+1 && mp[x][y]!= 'D' && mp[x][y] != 'T'){
                bee_dist[x][y] = bee_dist[pos.first][pos.second]+1;
                bees.push({x, y});
            }
        }
    }

    int l = -1, r = n*n;
    while(l<r){
        int mid = (l+r+1)>>1;
        if(check(mid))l=mid;
        else r=mid-1;
    }
    cout << l << "\n";
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2904 KB Output is correct
2 Correct 2 ms 2904 KB Output is correct
3 Correct 1 ms 2904 KB Output is correct
4 Correct 1 ms 2908 KB Output is correct
5 Correct 1 ms 2908 KB Output is correct
6 Correct 2 ms 2908 KB Output is correct
7 Correct 54 ms 6748 KB Output is correct
8 Correct 2 ms 2904 KB Output is correct
9 Correct 1 ms 2748 KB Output is correct
10 Correct 1 ms 2908 KB Output is correct
11 Correct 1 ms 2916 KB Output is correct
12 Correct 2 ms 2908 KB Output is correct
13 Correct 2 ms 2908 KB Output is correct
14 Correct 2 ms 3000 KB Output is correct
15 Correct 1 ms 2908 KB Output is correct
16 Correct 1 ms 2908 KB Output is correct
17 Correct 1 ms 2908 KB Output is correct
18 Correct 2 ms 2908 KB Output is correct
19 Correct 2 ms 2908 KB Output is correct
20 Correct 1 ms 2908 KB Output is correct
21 Correct 2 ms 2908 KB Output is correct
22 Correct 2 ms 3160 KB Output is correct
23 Correct 1 ms 3000 KB Output is correct
24 Correct 2 ms 2908 KB Output is correct
25 Correct 2 ms 2908 KB Output is correct
26 Correct 2 ms 2908 KB Output is correct
27 Correct 2 ms 2908 KB Output is correct
28 Correct 1 ms 2908 KB Output is correct
29 Correct 2 ms 2908 KB Output is correct
30 Correct 2 ms 2908 KB Output is correct
31 Correct 2 ms 2908 KB Output is correct
32 Correct 2 ms 2908 KB Output is correct
33 Correct 5 ms 3504 KB Output is correct
34 Correct 5 ms 3676 KB Output is correct
35 Correct 15 ms 3676 KB Output is correct
36 Correct 8 ms 3932 KB Output is correct
37 Correct 8 ms 3932 KB Output is correct
38 Correct 18 ms 3952 KB Output is correct
39 Correct 9 ms 4188 KB Output is correct
40 Correct 9 ms 4148 KB Output is correct
41 Correct 25 ms 4188 KB Output is correct
42 Correct 9 ms 4444 KB Output is correct
43 Correct 10 ms 4444 KB Output is correct
44 Correct 34 ms 4444 KB Output is correct
45 Correct 11 ms 4696 KB Output is correct
46 Correct 11 ms 4804 KB Output is correct
47 Correct 34 ms 4700 KB Output is correct
48 Correct 17 ms 4956 KB Output is correct
49 Correct 17 ms 5060 KB Output is correct
50 Correct 40 ms 4956 KB Output is correct
51 Correct 16 ms 5464 KB Output is correct
52 Correct 15 ms 5468 KB Output is correct
53 Correct 47 ms 5500 KB Output is correct
54 Correct 18 ms 5832 KB Output is correct
55 Correct 16 ms 5828 KB Output is correct
56 Correct 56 ms 5724 KB Output is correct
57 Correct 19 ms 6188 KB Output is correct
58 Correct 20 ms 6236 KB Output is correct
59 Correct 66 ms 6124 KB Output is correct
60 Correct 22 ms 6740 KB Output is correct
61 Correct 25 ms 6748 KB Output is correct
62 Correct 73 ms 6744 KB Output is correct
63 Correct 73 ms 6736 KB Output is correct
64 Correct 125 ms 6744 KB Output is correct
65 Correct 103 ms 6780 KB Output is correct
66 Correct 83 ms 6740 KB Output is correct
67 Correct 77 ms 6736 KB Output is correct
68 Correct 40 ms 6736 KB Output is correct
69 Correct 41 ms 6692 KB Output is correct
70 Correct 32 ms 6748 KB Output is correct
71 Correct 40 ms 6740 KB Output is correct
72 Correct 32 ms 6736 KB Output is correct
73 Correct 30 ms 6996 KB Output is correct
74 Correct 46 ms 6996 KB Output is correct
75 Correct 51 ms 7004 KB Output is correct
76 Correct 43 ms 7060 KB Output is correct
77 Correct 44 ms 7000 KB Output is correct
78 Correct 59 ms 7004 KB Output is correct
79 Correct 40 ms 6984 KB Output is correct
80 Correct 44 ms 7008 KB Output is correct
81 Correct 48 ms 6840 KB Output is correct
82 Correct 49 ms 6992 KB Output is correct
83 Correct 53 ms 6992 KB Output is correct
84 Correct 47 ms 6768 KB Output is correct
85 Correct 57 ms 6992 KB Output is correct
86 Correct 53 ms 7004 KB Output is correct
87 Correct 51 ms 7004 KB Output is correct
88 Correct 52 ms 6940 KB Output is correct
89 Correct 61 ms 6740 KB Output is correct
90 Correct 57 ms 6740 KB Output is correct
91 Correct 55 ms 6744 KB Output is correct
92 Correct 59 ms 6940 KB Output is correct