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Submission #578679

# Submission time Handle Problem Language Result Execution time Memory
578679 2022-06-17T14:59:22 Z a_aguilo Mecho (IOI09_mecho) C++14
38 / 100
 237 ms 6832 KB 
#include<bits/stdc++.h>

using namespace std;

typedef vector<int> vi;
typedef vector<vi> vvi;

typedef vector<char> vc;
typedef vector<vc> vvc;

int INF = 1e9;
int n, s;

vvi FloodFill (vector<pair<int, int>>& V, vvc& CharMap){
    vvi ans(n, vi(n, INF));
    queue<pair<int, int>> Q;
    for(pair<int, int> start : V){
        Q.push(start);
        ans[start.first][start.second] = 0;
    }
    while(!Q.empty()){
        pair<int, int> act = Q.front(); Q.pop();
        int Xact = act.first;
        int Yact = act.second;
        if(Xact > 0 and ans[Xact-1][Yact] == INF and CharMap[Xact-1][Yact] == 'G'){
            ans[Xact-1][Yact] = ans[Xact][Yact]+1;
            Q.push(make_pair(Xact-1, Yact));
        }
        if (Yact > 0 and ans[Xact][Yact-1]== INF and CharMap[Xact][Yact-1] == 'G'){
            ans[Xact][Yact-1] = ans[Xact][Yact]+1;
            Q.push(make_pair(Xact, Yact-1));
        }
        if(Xact < (n-1) and ans[Xact+1][Yact] == INF and CharMap[Xact+1][Yact] == 'G'){
            ans[Xact+1][Yact] = ans[Xact][Yact]+1;
            Q.push(make_pair(Xact+1, Yact));
        }
        if(Yact < (n-1) and ans[Xact][Yact+1] == INF and CharMap[Xact][Yact+1] == 'G'){
            ans[Xact][Yact+1] = ans[Xact][Yact]+1;
            Q.push(make_pair(Xact, Yact+1));
        }
    }
    return ans;
}

bool bfsMecho (pair<int, int> StartPos, int initialTime, vvi& listaAdy, vvc& CharMap){
    vvi visited (n, vi(n, 0));
    visited[StartPos.first][StartPos.second] = 1;
    queue<pair<int, pair<int, int>>> Q;
    Q.push(make_pair(initialTime*s, StartPos));
    while(!Q.empty()){
        pair<int, pair<int, int>> act = Q.front(); Q.pop();
        int PasosAct = act.first;
        int MinuteAct = PasosAct/s;
        int x = act.second.first;
        int y = act.second.second;

        if(CharMap[x][y] == 'D') return true;

        if(x > 0 and MinuteAct < listaAdy[x-1][y] and (CharMap[x-1][y] == 'G' or CharMap[x-1][y] == 'D') and !visited[x-1][y] ){
            Q.push(make_pair(PasosAct+1, make_pair(x-1, y)));
            visited[x-1][y] = 1;
        }
        if(y > 0 and MinuteAct < listaAdy[x][y-1] and (CharMap[x][y-1] == 'G' or CharMap[x][y-1] == 'D') and !visited[x][y-1]){
            Q.push(make_pair(PasosAct+1, make_pair(x, y-1)));
            visited[x][y-1] = 1;
        }
        if(x < (n-1) and MinuteAct < listaAdy[x+1][y] and (CharMap[x+1][y] == 'G' or CharMap[x+1][y] == 'D') and !visited[x+1][y]){
            Q.push(make_pair(PasosAct+1, make_pair(x+1, y)));
            visited[x+1][y] = 1;
        }
        if(y < (n-1) and MinuteAct < listaAdy[x][y+1] and (CharMap[x][y+1] == 'G' or CharMap[x][y+1] == 'D') and !visited[x][y+1] ){
            Q.push(make_pair(PasosAct+1, make_pair(x, y+1)));
            visited[x][y+1] = 1;
        }
    }
    return false;
}

int main(){
    char c;
    cin >> n >> s;
    vector<pair<int, int>> IniciosAbejas;
    pair<int, int> InicioMecho;
    vvc mapa(n, vc(n));
    for(int i = 0; i < n; ++i){
        for(int j = 0; j < n; ++j){
            cin >> c;
            //T = tree --> no one can pass
            //M = mecho initially
            //D = target
            //G = grass
            //H = hive
            if(c == 'M') InicioMecho = make_pair(i, j);
            else if (c == 'H') IniciosAbejas.push_back(make_pair(i, j));
            mapa[i][j] = c;
        }
    }
    vvi Matrix = FloodFill(IniciosAbejas, mapa);

    int hi = n*n;
    int lo = 0;
    while(hi >= lo){
        int mid = lo + (hi-lo)/2;
        if(bfsMecho(InicioMecho, mid, Matrix, mapa)) lo = mid+1;
        else hi = mid-1;
    }
    if(hi < 0) cout << -1 << endl;
    else cout << hi << endl;

    /*
    for(int i = 0; i < n; ++i){
        cout << Matrix[i][0];
        for(int j = 1; j < n; ++j){
            cout << " " << Matrix[i][j];
        }
        cout << endl;
    }*/

    return 0;
}

Subtask #1
38.0 / 100.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 212 KB Output isn't correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Incorrect 1 ms 296 KB Output isn't correct
4 Incorrect 1 ms 300 KB Output isn't correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 116 ms 6732 KB Output is correct
8 Incorrect 1 ms 212 KB Output isn't correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 1 ms 212 KB Output is correct
12 Incorrect 1 ms 340 KB Output isn't correct
13 Incorrect 1 ms 212 KB Output isn't correct
14 Correct 1 ms 296 KB Output is correct
15 Incorrect 1 ms 212 KB Output isn't correct
16 Correct 1 ms 212 KB Output is correct
17 Incorrect 1 ms 212 KB Output isn't correct
18 Correct 1 ms 212 KB Output is correct
19 Incorrect 1 ms 212 KB Output isn't correct
20 Correct 1 ms 300 KB Output is correct
21 Incorrect 1 ms 300 KB Output isn't correct
22 Correct 1 ms 212 KB Output is correct
23 Incorrect 1 ms 212 KB Output isn't correct
24 Correct 1 ms 212 KB Output is correct
25 Incorrect 1 ms 212 KB Output isn't correct
26 Correct 1 ms 212 KB Output is correct
27 Incorrect 1 ms 340 KB Output isn't correct
28 Correct 1 ms 340 KB Output is correct
29 Incorrect 1 ms 340 KB Output isn't correct
30 Correct 1 ms 304 KB Output is correct
31 Incorrect 1 ms 340 KB Output isn't correct
32 Correct 1 ms 340 KB Output is correct
33 Incorrect 11 ms 1532 KB Output isn't correct
34 Correct 11 ms 1588 KB Output is correct
35 Correct 27 ms 1524 KB Output is correct
36 Incorrect 17 ms 1876 KB Output isn't correct
37 Correct 18 ms 1876 KB Output is correct
38 Correct 40 ms 1904 KB Output is correct
39 Incorrect 20 ms 2320 KB Output isn't correct
40 Correct 20 ms 2364 KB Output is correct
41 Correct 47 ms 2324 KB Output is correct
42 Incorrect 27 ms 2784 KB Output isn't correct
43 Correct 24 ms 2800 KB Output is correct
44 Correct 65 ms 2812 KB Output is correct
45 Incorrect 29 ms 3364 KB Output isn't correct
46 Correct 30 ms 3420 KB Output is correct
47 Correct 65 ms 3308 KB Output is correct
48 Incorrect 37 ms 3936 KB Output isn't correct
49 Correct 37 ms 3956 KB Output is correct
50 Correct 87 ms 3924 KB Output is correct
51 Incorrect 41 ms 4484 KB Output isn't correct
52 Correct 41 ms 4544 KB Output is correct
53 Correct 113 ms 4504 KB Output is correct
54 Incorrect 46 ms 5220 KB Output isn't correct
55 Correct 46 ms 5216 KB Output is correct
56 Correct 123 ms 5192 KB Output is correct
57 Incorrect 60 ms 5920 KB Output isn't correct
58 Correct 55 ms 5908 KB Output is correct
59 Correct 139 ms 5908 KB Output is correct
60 Incorrect 66 ms 6700 KB Output isn't correct
61 Correct 67 ms 6744 KB Output is correct
62 Correct 151 ms 6704 KB Output is correct
63 Correct 152 ms 6664 KB Output is correct
64 Correct 237 ms 6748 KB Output is correct
65 Correct 191 ms 6712 KB Output is correct
66 Incorrect 181 ms 6744 KB Output isn't correct
67 Correct 161 ms 6688 KB Output is correct
68 Correct 95 ms 6748 KB Output is correct
69 Correct 91 ms 6720 KB Output is correct
70 Correct 77 ms 6680 KB Output is correct
71 Correct 92 ms 6792 KB Output is correct
72 Incorrect 76 ms 6728 KB Output isn't correct
73 Incorrect 104 ms 6716 KB Output isn't correct
74 Correct 99 ms 6720 KB Output is correct
75 Correct 103 ms 6716 KB Output is correct
76 Correct 97 ms 6736 KB Output is correct
77 Correct 103 ms 6716 KB Output is correct
78 Correct 128 ms 6712 KB Output is correct
79 Correct 87 ms 6772 KB Output is correct
80 Correct 94 ms 6720 KB Output is correct
81 Correct 107 ms 6748 KB Output is correct
82 Correct 93 ms 6692 KB Output is correct
83 Correct 119 ms 6712 KB Output is correct
84 Correct 110 ms 6832 KB Output is correct
85 Correct 114 ms 6724 KB Output is correct
86 Correct 112 ms 6720 KB Output is correct
87 Correct 113 ms 6760 KB Output is correct
88 Correct 127 ms 6700 KB Output is correct
89 Correct 123 ms 6712 KB Output is correct
90 Correct 119 ms 6700 KB Output is correct
91 Correct 113 ms 6772 KB Output is correct
92 Correct 127 ms 6700 KB Output is correct