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Submission #1100134

# Submission time Handle Problem Language Result Execution time Memory
1100134 2024-10-12T22:01:04 Z egccge Mecho (IOI09_mecho) C++14
100 / 100
 150 ms 9372 KB 
#include <bits/stdc++.h>
using namespace std;

int n, s, mx, my, ex, ey;
const int MAXN = 807;
char grid[MAXN][MAXN];
int bees[MAXN][MAXN];
int mecho[MAXN][MAXN];
int visited[MAXN][MAXN];
int d1[] = {0, 1, 0, -1};
int d2[] = {1, 0, -1, 0};

bool valid(int dx, int dy){
    return dx >= 0 && dx < n && dy >= 0 && dy < n && (grid[dx][dy] == 'G' || grid[dx][dy] == 'M');
}

bool chega(int m, int b){
    return ((m/s) < b);
}

bool check(int d){

    if(bees[mx][my] <= d) return false;

    queue<pair<int, int>> pq;
    pq.push({mx, my});

    //reset
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            visited[i][j] = 0;
            mecho[i][j] = 0;
        }
    }
    
    visited[mx][my] = 1;
    while(!pq.empty()){
        auto [i, j] = pq.front(); pq.pop();
        for(int x = 0; x < 4; x++){
            int dx = d1[x] + i;
            int dy = d2[x] + j;
            if(valid(dx, dy) && !visited[dx][dy] && chega(mecho[i][j] + 1, bees[dx][dy] - d)){
                mecho[dx][dy] = mecho[i][j] + 1;
                visited[dx][dy] = 1;
                pq.push({dx, dy});
            }
        }
    }


    // cout << "mecho here" << endl;
    // for(int i = 0; i < n; i++){
    //     for(int j = 0; j < n; j++){
    //         cout << mecho[i][j] << " ";
    //     }
    //     cout << endl;
    // }

    bool res = false;
    for(int i = 0; i < 4; i++){
        int dx = d1[i] + ex;
        int dy = d2[i] + ey;
        if(valid(dx, dy) && chega(mecho[dx][dy], bees[dx][dy]) && visited[dx][dy]){
            res = true;
        }
    }
    return res;
}

int main(){
    cin >> n >> s;
    vector<pair<int, int>> h;
    for(int i = 0; i < n; i++){
        for(int j = 0; j < n; j++){
            cin >> grid[i][j];
            if(grid[i][j] == 'H')
                h.push_back({i, j});
            else if(grid[i][j] == 'M'){
                mx = i;
                my = j;
            }else if(grid[i][j] == 'D'){
                ex = i;
                ey = j;
            }

        }
    }

     //bfs para bees
    //t, i, j
    queue<pair<int, int>> pq;
    for(auto u : h)  pq.push({u.first, u.second});
    
    //funcionando o bfs para as abelhas!!
    while(!pq.empty()){
        auto [i, j] = pq.front();
        pq.pop();
        for(int x = 0; x < 4; x++){
            int dx = d1[x] + i;
            int dy = d2[x] + j;
            if(valid(dx, dy) && !bees[dx][dy]){
                bees[dx][dy] = bees[i][j] + 1;
                pq.push({dx, dy});
            }
        }
    }


    // for(int i = 0; i < n; i++){
    //     for(int j = 0; j < n; j++){
    //         cout << bees[i][j] << " ";
    //     }
    //     cout << endl;
    // }


    int l = 0, r = n*n; 
    while(l <= r){
        //cout << l << " " << r << endl;
        int mid = (l+r)/2;
        if(check(mid)) l = mid+1;
        else r = mid-1;
    }

    cout << l-1 << endl;

}

Compilation message

mecho.cpp: In function 'bool check(int)':
mecho.cpp:38:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   38 |         auto [i, j] = pq.front(); pq.pop();
      |              ^
mecho.cpp: In function 'int main()':
mecho.cpp:96:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   96 |         auto [i, j] = pq.front();
      |              ^

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 0 ms 444 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 70 ms 9044 KB Output is correct
8 Correct 0 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 0 ms 604 KB Output is correct
11 Correct 1 ms 604 KB Output is correct
12 Correct 1 ms 952 KB Output is correct
13 Correct 1 ms 860 KB Output is correct
14 Correct 1 ms 860 KB Output is correct
15 Correct 0 ms 604 KB Output is correct
16 Correct 1 ms 604 KB Output is correct
17 Correct 0 ms 700 KB Output is correct
18 Correct 1 ms 604 KB Output is correct
19 Correct 1 ms 604 KB Output is correct
20 Correct 1 ms 604 KB Output is correct
21 Correct 0 ms 860 KB Output is correct
22 Correct 1 ms 860 KB Output is correct
23 Correct 1 ms 860 KB Output is correct
24 Correct 1 ms 860 KB Output is correct
25 Correct 1 ms 860 KB Output is correct
26 Correct 1 ms 860 KB Output is correct
27 Correct 1 ms 1116 KB Output is correct
28 Correct 2 ms 1116 KB Output is correct
29 Correct 1 ms 1116 KB Output is correct
30 Correct 2 ms 1116 KB Output is correct
31 Correct 1 ms 1116 KB Output is correct
32 Correct 1 ms 1116 KB Output is correct
33 Correct 7 ms 4104 KB Output is correct
34 Correct 8 ms 3928 KB Output is correct
35 Correct 18 ms 3932 KB Output is correct
36 Correct 9 ms 4568 KB Output is correct
37 Correct 10 ms 4700 KB Output is correct
38 Correct 25 ms 4696 KB Output is correct
39 Correct 12 ms 5036 KB Output is correct
40 Correct 12 ms 5212 KB Output is correct
41 Correct 32 ms 5016 KB Output is correct
42 Correct 14 ms 5724 KB Output is correct
43 Correct 15 ms 5636 KB Output is correct
44 Correct 45 ms 5728 KB Output is correct
45 Correct 17 ms 6240 KB Output is correct
46 Correct 16 ms 6276 KB Output is correct
47 Correct 42 ms 6188 KB Output is correct
48 Correct 20 ms 7000 KB Output is correct
49 Correct 21 ms 6732 KB Output is correct
50 Correct 50 ms 6748 KB Output is correct
51 Correct 23 ms 7516 KB Output is correct
52 Correct 24 ms 7516 KB Output is correct
53 Correct 65 ms 7504 KB Output is correct
54 Correct 26 ms 7856 KB Output is correct
55 Correct 26 ms 7880 KB Output is correct
56 Correct 83 ms 8028 KB Output is correct
57 Correct 30 ms 8528 KB Output is correct
58 Correct 31 ms 8416 KB Output is correct
59 Correct 83 ms 8532 KB Output is correct
60 Correct 33 ms 9040 KB Output is correct
61 Correct 34 ms 9144 KB Output is correct
62 Correct 89 ms 8924 KB Output is correct
63 Correct 85 ms 9040 KB Output is correct
64 Correct 150 ms 9040 KB Output is correct
65 Correct 121 ms 8948 KB Output is correct
66 Correct 98 ms 8960 KB Output is correct
67 Correct 93 ms 9148 KB Output is correct
68 Correct 47 ms 9168 KB Output is correct
69 Correct 49 ms 9040 KB Output is correct
70 Correct 42 ms 9044 KB Output is correct
71 Correct 43 ms 9044 KB Output is correct
72 Correct 39 ms 9000 KB Output is correct
73 Correct 41 ms 9304 KB Output is correct
74 Correct 56 ms 9304 KB Output is correct
75 Correct 68 ms 9300 KB Output is correct
76 Correct 102 ms 9296 KB Output is correct
77 Correct 60 ms 9268 KB Output is correct
78 Correct 105 ms 9196 KB Output is correct
79 Correct 84 ms 9296 KB Output is correct
80 Correct 87 ms 9300 KB Output is correct
81 Correct 65 ms 9296 KB Output is correct
82 Correct 58 ms 9300 KB Output is correct
83 Correct 68 ms 9156 KB Output is correct
84 Correct 89 ms 9144 KB Output is correct
85 Correct 86 ms 9200 KB Output is correct
86 Correct 79 ms 9316 KB Output is correct
87 Correct 97 ms 9372 KB Output is correct
88 Correct 77 ms 9300 KB Output is correct
89 Correct 72 ms 9316 KB Output is correct
90 Correct 80 ms 9084 KB Output is correct
91 Correct 82 ms 9072 KB Output is correct
92 Correct 88 ms 9072 KB Output is correct