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Submission #1019494

# Submission time Handle Problem Language Result Execution time Memory
1019494 2024-07-11T00:24:52 Z lucascgar Mecho (IOI09_mecho) C++17
84 / 100
 122 ms 7040 KB 
#include <bits/stdc++.h>

// #pragma GCC optimize("Ofast,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

using namespace std;

/*
precalcula p grid o tempo que cada célula leva até ser ocupada por abelhas
binary search no tempo
p verificar se tempo x é válido:
floodfill do mecho começando no tempo x e ignorando s:
    continuar só se (dist[i][j]+s-1)/s + x < bee[i][j] ou se (dist[i][j]+s-1)/s + x == bee[i][j] e se nn for o último movimento, = dist[i][j]%s != 0
*/

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()); // overclock random

typedef pair<int,int> pii;
typedef pair<long long, long long> pll;
typedef pair<double, double> pdd;

const int MAXN = 800+10;

bool g[MAXN][MAXN];
int bs[MAXN][MAXN]; // bs=bees

int d[MAXN][MAXN]; // distance (mecho)
int aux[4] = {1, -1, 0, 0};
signed main(){
    std::ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    // freopen("test.in", "r", stdin);
    // freopen("test.out", "w", stdout);
    // cout << fixed << setprecision(12);

    int n, s;
    cin >> n >> s;
    char x;
    pii st = {0,0}, en = {0,0};
    queue<pii> bq;
    for (int i=1;i<=n;i++) for (int j=1;j<=n;j++){
        cin >> x;
        g[i][j] = (x=='G');
        bs[i][j] = 1e9;

        if (x=='H'){
            bq.emplace(i,j);
            bs[i][j] = 0;
        }
        else if (x =='M') st = {i,j};
        else if (x == 'D') en = {i, j};


    }

    while (!bq.empty()){
        pii u = bq.front();
        bq.pop();

        int nd = bs[u.first][u.second]+1;

        for (int a=0,b=3;a<4;a++,b--){
            int ni = u.first+aux[a], nj = u.second+aux[b];

            if (bs[ni][nj] == 1e9 && g[ni][nj]){
                bs[ni][nj] = nd;
                bq.emplace(ni, nj);
            }

        }

    }

    g[en.first][en.second] = g[st.first][st.second] = 1;
    bool tru = 0;
    int in = 0, fi = 1e9, me;
    while (in<=fi){
        me = (in+fi)/2;
        for (int i=1;i<=n;i++) for (int j=1;j<=n;j++) d[i][j] = 1e9;

        d[st.first][st.second] = 0;
        queue<pii> mq;
        mq.push(st);

        while (!mq.empty()){
            pii u = mq.front();
            mq.pop();
            int nd = d[u.first][u.second]+1;

            for (int a=0,b=3;a<4;a++,b--){
                int ni = u.first+aux[a], nj = u.second+aux[b];
                if (!g[ni][nj] || d[ni][nj] != 1e9) continue;

                if (me + (nd+s-1)/s < bs[ni][nj] || (me + (nd+s-1)/s == bs[ni][nj] && nd%s != 0)){
                    d[ni][nj] = nd;
                    mq.emplace(ni, nj);
                }

            }
        }

        if (d[en.first][en.second] != 1e9){
            tru=1, in = me+1;
        }else fi = me-1;

    }



    if (!tru) cout << "-1\n";

    else cout << in-1 << "\n"; 

    return 0;
}

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 0 ms 2396 KB Output is correct
7 Correct 59 ms 6772 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 0 ms 2572 KB Output is correct
12 Incorrect 1 ms 2652 KB Output isn't correct
13 Incorrect 1 ms 2648 KB Output isn't correct
14 Correct 1 ms 4700 KB Output is correct
15 Correct 0 ms 2392 KB Output is correct
16 Correct 1 ms 2400 KB Output is correct
17 Correct 1 ms 2396 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2400 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2652 KB Output is correct
22 Correct 0 ms 2652 KB Output is correct
23 Correct 1 ms 2652 KB Output is correct
24 Correct 1 ms 2520 KB Output is correct
25 Correct 1 ms 4708 KB Output is correct
26 Correct 1 ms 4696 KB Output is correct
27 Correct 1 ms 2656 KB Output is correct
28 Correct 1 ms 4700 KB Output is correct
29 Correct 1 ms 2768 KB Output is correct
30 Correct 1 ms 2652 KB Output is correct
31 Correct 1 ms 2652 KB Output is correct
32 Correct 1 ms 2652 KB Output is correct
33 Correct 6 ms 4024 KB Output is correct
34 Correct 6 ms 4956 KB Output is correct
35 Correct 13 ms 3936 KB Output is correct
36 Correct 7 ms 4124 KB Output is correct
37 Correct 7 ms 5212 KB Output is correct
38 Correct 18 ms 4272 KB Output is correct
39 Correct 8 ms 5216 KB Output is correct
40 Correct 9 ms 4448 KB Output is correct
41 Correct 22 ms 4452 KB Output is correct
42 Correct 10 ms 4744 KB Output is correct
43 Correct 11 ms 4708 KB Output is correct
44 Correct 28 ms 4708 KB Output is correct
45 Correct 13 ms 4956 KB Output is correct
46 Correct 13 ms 4960 KB Output is correct
47 Correct 35 ms 4952 KB Output is correct
48 Correct 14 ms 5208 KB Output is correct
49 Correct 15 ms 5212 KB Output is correct
50 Correct 40 ms 5372 KB Output is correct
51 Correct 18 ms 5720 KB Output is correct
52 Correct 18 ms 5724 KB Output is correct
53 Correct 56 ms 5724 KB Output is correct
54 Correct 20 ms 6108 KB Output is correct
55 Correct 29 ms 6236 KB Output is correct
56 Correct 54 ms 6236 KB Output is correct
57 Correct 21 ms 6544 KB Output is correct
58 Correct 21 ms 6492 KB Output is correct
59 Correct 65 ms 6492 KB Output is correct
60 Correct 23 ms 6748 KB Output is correct
61 Correct 23 ms 6748 KB Output is correct
62 Correct 75 ms 6748 KB Output is correct
63 Correct 83 ms 6744 KB Output is correct
64 Correct 122 ms 6740 KB Output is correct
65 Correct 112 ms 6740 KB Output is correct
66 Correct 86 ms 6736 KB Output is correct
67 Correct 79 ms 6748 KB Output is correct
68 Correct 44 ms 6648 KB Output is correct
69 Correct 52 ms 6740 KB Output is correct
70 Correct 37 ms 6744 KB Output is correct
71 Correct 40 ms 6684 KB Output is correct
72 Incorrect 37 ms 6748 KB Output isn't correct
73 Incorrect 47 ms 7004 KB Output isn't correct
74 Correct 45 ms 6992 KB Output is correct
75 Correct 48 ms 7004 KB Output is correct
76 Correct 50 ms 6996 KB Output is correct
77 Correct 50 ms 7004 KB Output is correct
78 Correct 52 ms 7040 KB Output is correct
79 Correct 44 ms 6996 KB Output is correct
80 Correct 44 ms 6992 KB Output is correct
81 Correct 50 ms 7004 KB Output is correct
82 Correct 51 ms 6816 KB Output is correct
83 Correct 53 ms 7020 KB Output is correct
84 Correct 57 ms 7004 KB Output is correct
85 Correct 49 ms 7000 KB Output is correct
86 Correct 53 ms 7004 KB Output is correct
87 Correct 52 ms 6992 KB Output is correct
88 Correct 54 ms 6940 KB Output is correct
89 Correct 55 ms 6732 KB Output is correct
90 Correct 56 ms 6748 KB Output is correct
91 Correct 56 ms 6748 KB Output is correct
92 Correct 57 ms 6740 KB Output is correct