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Submission #513899

# Submission time Handle Problem Language Result Execution time Memory
513899 2022-01-17T23:00:51 Z nhuang685 Mecho (IOI09_mecho) C++17
100 / 100
 201 ms 6724 KB 
#include <bits/stdc++.h>

#ifdef VSLOCAL
#include "debug/d.h"
#endif
#ifdef LOCAL
// Don't use this for USACO
#include "../../debug/d.h"
#endif

using namespace std;

using ll = long long;
using ld = long double;
#if defined(LOCAL) || defined(VSLOCAL)
#define dbg(...) line_info(__LINE__, #__VA_ARGS__), dbg1(__VA_ARGS__)
void nline() { cerr << '\n'; }
#else
#define dbg(...) 0
void nline() {}
#endif

int main() {
    ios::sync_with_stdio(0); cin.tie(0);

    #ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("log.txt", "w", stderr);
    #endif

    const array<int, 4> dx {-1, 0, 1, 0}, dy {0, 1, 0, -1};

    // int N, S;
    int N; ll S;
    cin >> N >> S;
    vector<vector<char>> grid (N, vector<char> (N));
    queue<pair<ll, pair<int, int>>> q;
    vector<vector<ll>> beetime (N, vector<ll> (N, (ll)4e18));
    vector<vector<bool>> visited (N, vector<bool> (N));
    pair<int, int> honey, home;

    for (int i = 0; i < N; ++i) {
        for (int j = 0; j < N; ++j) {
            cin >> grid[i][j];
            if (grid[i][j] == 'H') { 
                q.push({0, {i, j}}); 
                visited[i][j] = true;
                beetime[i][j] = 0;
            }
            else if (grid[i][j] == 'M') honey = {i, j};
            else if (grid[i][j] == 'D') home = {i, j};
        }
    }

    while (!q.empty()) {
        auto [dist, loc] = q.front();
        q.pop();

        for (int d = 0; d < 4; ++d) {
            pair<int, int> nloc = {loc.first + dx[d], loc.second + dy[d]};
            if (nloc.first < 0 || nloc.first >= N || nloc.second < 0 || nloc.second >= N || visited[nloc.first][nloc.second]) continue;
            if (grid[nloc.first][nloc.second] == 'G' || grid[nloc.first][nloc.second] == 'M') {
                visited[nloc.first][nloc.second] = true;
                beetime[nloc.first][nloc.second] = dist + S;
                q.push({dist + S, nloc});
            }
        }
    }
    dbg(beetime);

    auto good = [&](ll val) {
        visited.assign(N, vector<bool> (N));
        visited[honey.first][honey.second] = true;
        queue<pair<ll, pair<int, int>>> q;
        q.push({val * S, honey});
        if (val * S >= beetime[honey.first][honey.second]) return false;
        while (!q.empty()) {
            auto [dist, loc] = q.front();
            q.pop();

            for (int d = 0; d < 4; ++d) {
                pair<int, int> nloc = {loc.first + dx[d], loc.second + dy[d]};
                if (nloc.first < 0 || nloc.first >= N || nloc.second < 0 || nloc.second >= N 
                    || visited[nloc.first][nloc.second] || dist + 1 >= beetime[nloc.first][nloc.second]) continue;
                if (grid[nloc.first][nloc.second] == 'D') {
                    return true;
                }
                else if (grid[nloc.first][nloc.second] == 'G') {
                    visited[nloc.first][nloc.second] = true;
                    q.push({dist + 1, nloc});
                }
            }
        }
        return false;
    };

    ll low = 0, high = 1e16;
    while (low < high) {
        ll mid = (low + high + 1) / 2;
        if (good(mid)) low = mid;
        else high = mid - 1;
    }
    
    if (good(low)) cout << low << '\n';
    else cout << "-1\n";
    // cout << "-1\n";
}

Compilation message

mecho.cpp: In function 'int main()':
mecho.cpp:19:18: warning: statement has no effect [-Wunused-value]
   19 | #define dbg(...) 0
      |                  ^
mecho.cpp:69:5: note: in expansion of macro 'dbg'
   69 |     dbg(beetime);
      |     ^~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 KB Output is correct
5 Correct 0 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 100 ms 6348 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 0 ms 204 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 1 ms 332 KB Output is correct
13 Correct 1 ms 332 KB Output is correct
14 Correct 1 ms 332 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 1 ms 204 KB Output is correct
18 Correct 0 ms 204 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 1 ms 204 KB Output is correct
22 Correct 1 ms 204 KB Output is correct
23 Correct 1 ms 332 KB Output is correct
24 Correct 1 ms 332 KB Output is correct
25 Correct 1 ms 332 KB Output is correct
26 Correct 1 ms 356 KB Output is correct
27 Correct 1 ms 332 KB Output is correct
28 Correct 0 ms 332 KB Output is correct
29 Correct 1 ms 332 KB Output is correct
30 Correct 1 ms 332 KB Output is correct
31 Correct 1 ms 332 KB Output is correct
32 Correct 1 ms 332 KB Output is correct
33 Correct 5 ms 1460 KB Output is correct
34 Correct 6 ms 1356 KB Output is correct
35 Correct 23 ms 1356 KB Output is correct
36 Correct 6 ms 1740 KB Output is correct
37 Correct 6 ms 1740 KB Output is correct
38 Correct 30 ms 1740 KB Output is correct
39 Correct 9 ms 2124 KB Output is correct
40 Correct 7 ms 2180 KB Output is correct
41 Correct 42 ms 2176 KB Output is correct
42 Correct 11 ms 2508 KB Output is correct
43 Correct 12 ms 2612 KB Output is correct
44 Correct 49 ms 2604 KB Output is correct
45 Correct 12 ms 3080 KB Output is correct
46 Correct 12 ms 3020 KB Output is correct
47 Correct 58 ms 3072 KB Output is correct
48 Correct 14 ms 3608 KB Output is correct
49 Correct 13 ms 3608 KB Output is correct
50 Correct 76 ms 3604 KB Output is correct
51 Correct 13 ms 4172 KB Output is correct
52 Correct 13 ms 4172 KB Output is correct
53 Correct 85 ms 4172 KB Output is correct
54 Correct 21 ms 4776 KB Output is correct
55 Correct 21 ms 4684 KB Output is correct
56 Correct 124 ms 4788 KB Output is correct
57 Correct 25 ms 5324 KB Output is correct
58 Correct 28 ms 5420 KB Output is correct
59 Correct 127 ms 5452 KB Output is correct
60 Correct 22 ms 6092 KB Output is correct
61 Correct 23 ms 6132 KB Output is correct
62 Correct 136 ms 6132 KB Output is correct
63 Correct 131 ms 6120 KB Output is correct
64 Correct 201 ms 6132 KB Output is correct
65 Correct 171 ms 6092 KB Output is correct
66 Correct 147 ms 6116 KB Output is correct
67 Correct 143 ms 6248 KB Output is correct
68 Correct 57 ms 6092 KB Output is correct
69 Correct 48 ms 6172 KB Output is correct
70 Correct 47 ms 6092 KB Output is correct
71 Correct 45 ms 6176 KB Output is correct
72 Correct 36 ms 6136 KB Output is correct
73 Correct 44 ms 6656 KB Output is correct
74 Correct 71 ms 6724 KB Output is correct
75 Correct 77 ms 6604 KB Output is correct
76 Correct 70 ms 6676 KB Output is correct
77 Correct 69 ms 6604 KB Output is correct
78 Correct 85 ms 6608 KB Output is correct
79 Correct 65 ms 6612 KB Output is correct
80 Correct 79 ms 6616 KB Output is correct
81 Correct 76 ms 6604 KB Output is correct
82 Correct 70 ms 6604 KB Output is correct
83 Correct 86 ms 6532 KB Output is correct
84 Correct 78 ms 6532 KB Output is correct
85 Correct 81 ms 6552 KB Output is correct
86 Correct 87 ms 6664 KB Output is correct
87 Correct 85 ms 6512 KB Output is correct
88 Correct 86 ms 6392 KB Output is correct
89 Correct 86 ms 6440 KB Output is correct
90 Correct 90 ms 6440 KB Output is correct
91 Correct 88 ms 6388 KB Output is correct
92 Correct 104 ms 6440 KB Output is correct