oj.uz

Submission #1019496

# Submission time Handle Problem Language Result Execution time Memory
1019496 2024-07-11T01:03:53 Z lucascgar Mecho (IOI09_mecho) C++17
100 / 100
 118 ms 7068 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' || x=='M');
        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;

        if (bs[st.first][st.second] <= me){
            fi = me-1;
            continue;
        }

        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
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 46 ms 7064 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 860 KB Output is correct
13 Correct 0 ms 604 KB Output is correct
14 Correct 1 ms 860 KB Output is correct
15 Correct 0 ms 604 KB Output is correct
16 Correct 0 ms 604 KB Output is correct
17 Correct 1 ms 604 KB Output is correct
18 Correct 0 ms 604 KB Output is correct
19 Correct 1 ms 604 KB Output is correct
20 Correct 0 ms 604 KB Output is correct
21 Correct 1 ms 600 KB Output is correct
22 Correct 0 ms 604 KB Output is correct
23 Correct 1 ms 716 KB Output is correct
24 Correct 0 ms 604 KB Output is correct
25 Correct 0 ms 860 KB Output is correct
26 Correct 1 ms 860 KB Output is correct
27 Correct 1 ms 860 KB Output is correct
28 Correct 0 ms 860 KB Output is correct
29 Correct 1 ms 856 KB Output is correct
30 Correct 1 ms 860 KB Output is correct
31 Correct 1 ms 860 KB Output is correct
32 Correct 0 ms 860 KB Output is correct
33 Correct 4 ms 2908 KB Output is correct
34 Correct 7 ms 2908 KB Output is correct
35 Correct 12 ms 2908 KB Output is correct
36 Correct 4 ms 3304 KB Output is correct
37 Correct 5 ms 3420 KB Output is correct
38 Correct 15 ms 3292 KB Output is correct
39 Correct 5 ms 3676 KB Output is correct
40 Correct 6 ms 3696 KB Output is correct
41 Correct 18 ms 3880 KB Output is correct
42 Correct 6 ms 4188 KB Output is correct
43 Correct 5 ms 4188 KB Output is correct
44 Correct 24 ms 4188 KB Output is correct
45 Correct 7 ms 4688 KB Output is correct
46 Correct 7 ms 4544 KB Output is correct
47 Correct 30 ms 4696 KB Output is correct
48 Correct 9 ms 4952 KB Output is correct
49 Correct 9 ms 4960 KB Output is correct
50 Correct 35 ms 4956 KB Output is correct
51 Correct 10 ms 5468 KB Output is correct
52 Correct 11 ms 5468 KB Output is correct
53 Correct 42 ms 5376 KB Output is correct
54 Correct 13 ms 5720 KB Output is correct
55 Correct 14 ms 5724 KB Output is correct
56 Correct 57 ms 5720 KB Output is correct
57 Correct 15 ms 6232 KB Output is correct
58 Correct 12 ms 6236 KB Output is correct
59 Correct 55 ms 6368 KB Output is correct
60 Correct 13 ms 6748 KB Output is correct
61 Correct 15 ms 6748 KB Output is correct
62 Correct 62 ms 6748 KB Output is correct
63 Correct 71 ms 6736 KB Output is correct
64 Correct 116 ms 6748 KB Output is correct
65 Correct 118 ms 6748 KB Output is correct
66 Correct 78 ms 6744 KB Output is correct
67 Correct 74 ms 6564 KB Output is correct
68 Correct 36 ms 6736 KB Output is correct
69 Correct 36 ms 6740 KB Output is correct
70 Correct 28 ms 6748 KB Output is correct
71 Correct 32 ms 6748 KB Output is correct
72 Correct 27 ms 6744 KB Output is correct
73 Correct 23 ms 7004 KB Output is correct
74 Correct 33 ms 7068 KB Output is correct
75 Correct 36 ms 7000 KB Output is correct
76 Correct 43 ms 6992 KB Output is correct
77 Correct 35 ms 6996 KB Output is correct
78 Correct 37 ms 7000 KB Output is correct
79 Correct 32 ms 7004 KB Output is correct
80 Correct 34 ms 7000 KB Output is correct
81 Correct 37 ms 7004 KB Output is correct
82 Correct 32 ms 7004 KB Output is correct
83 Correct 52 ms 6996 KB Output is correct
84 Correct 41 ms 6992 KB Output is correct
85 Correct 38 ms 7004 KB Output is correct
86 Correct 41 ms 6816 KB Output is correct
87 Correct 40 ms 7004 KB Output is correct
88 Correct 43 ms 6744 KB Output is correct
89 Correct 48 ms 6948 KB Output is correct
90 Correct 46 ms 6872 KB Output is correct
91 Correct 44 ms 6748 KB Output is correct
92 Correct 43 ms 6708 KB Output is correct