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Submission #489344

# Submission time Handle Problem Language Result Execution time Memory
489344 2021-11-22T16:43:48 Z Alexandruabcde Mecho (IOI09_mecho) C++14
84 / 100
 1000 ms 4916 KB 
#include <bits/stdc++.h>

using namespace std;

constexpr int NMAX = 805;
typedef pair <int, int> PII;

int N, S;
char init[NMAX][NMAX];
int viz[NMAX][NMAX];

int dx[] = {1, -1, 0, 0};
int dy[] = {0, 0, 1, -1};

void Read () {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> N >> S;

    for (int i = 1; i <= N; ++ i )
        for (int j = 1; j <= N; ++ j )
            cin >> init[i][j];
}

bool Interior (int x, int y) {
    return 0 < x && x < N+1 && 0 < y && y < N+1;
}

void Expand (queue <PII> &Bees) {
    queue <PII> next;

    while (!Bees.empty()) {
        PII P = Bees.front();
        Bees.pop();

        for (int i = 0; i < 4; ++ i ) {
            PII urm = {P.first + dx[i], P.second + dy[i]};

            if (Interior(urm.first, urm.second) && init[urm.first][urm.second] == 'G' && viz[urm.first][urm.second] != -1) {
                next.push(urm);
                viz[urm.first][urm.second] = -1;
            }
        }
    }

    Bees = next;
}

bool Check (int wait) {
    queue <PII> Ends, CanExp;
    PII finish;

    for (int i = 1; i <= N; ++ i ) {
        for (int j = 1; j <= N; ++ j ) {
            if (init[i][j] == 'T') viz[i][j] = -1;

            if (init[i][j] == 'G') viz[i][j] = 0;

            if (init[i][j] == 'M') {
                Ends.push({i, j});
                viz[i][j] = 1;
            }

            if (init[i][j] == 'D') {
                finish = {i, j};
                viz[i][j] = 0;
            }

            if (init[i][j] == 'H') {
                CanExp.push({i, j});
                viz[i][j] = -1;
            }
        }
    }

    for (int i = 1; i <= wait; ++ i )
        Expand(CanExp);

    bool finished = 0;
    while (!finished && !Ends.empty()) {
        for (int pas = 1; pas <= S; ++ pas ) {
            queue <PII> nextEnds;
            while (!Ends.empty()) {
                PII P = Ends.front();
                Ends.pop();

                if (viz[P.first][P.second] != 1) continue;

                for (int i = 0; i < 4; ++ i ) {
                    PII urm = {P.first + dx[i], P.second + dy[i]};

                    if (Interior(urm.first, urm.second) && viz[urm.first][urm.second] == 0) {
                        nextEnds.push(urm);
                        viz[urm.first][urm.second] = 1;
                    }
                }
            }

            Ends = nextEnds;
        }

        if (viz[finish.first][finish.second]) finished = 1;
        Expand(CanExp);
    }

    return finished;
}

void Solve () {
    int st = 0, dr = N * N;
    int ans = -1;

    while (st <= dr) {
        int mij = (st + dr) / 2;

        if (Check(mij)) {
            ans = mij;
            st = mij + 1;
        }
        else dr = mij - 1;
    }

    cout << ans << '\n';
}

int main () {
    Read();
    Solve();

    return 0;
}

Subtask #1
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 0 ms 320 KB Output is correct
5 Correct 0 ms 332 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 393 ms 4308 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 0 ms 320 KB Output is correct
11 Correct 0 ms 332 KB Output is correct
12 Incorrect 3 ms 460 KB Output isn't correct
13 Incorrect 1 ms 460 KB Output isn't correct
14 Correct 2 ms 460 KB Output is correct
15 Correct 0 ms 332 KB Output is correct
16 Correct 1 ms 332 KB Output is correct
17 Correct 1 ms 332 KB Output is correct
18 Correct 1 ms 332 KB Output is correct
19 Correct 1 ms 332 KB Output is correct
20 Correct 1 ms 332 KB Output is correct
21 Correct 1 ms 460 KB Output is correct
22 Correct 1 ms 460 KB Output is correct
23 Correct 2 ms 460 KB Output is correct
24 Correct 1 ms 460 KB Output is correct
25 Correct 3 ms 460 KB Output is correct
26 Correct 2 ms 580 KB Output is correct
27 Correct 3 ms 588 KB Output is correct
28 Correct 2 ms 576 KB Output is correct
29 Correct 4 ms 588 KB Output is correct
30 Correct 5 ms 588 KB Output is correct
31 Correct 4 ms 588 KB Output is correct
32 Correct 3 ms 588 KB Output is correct
33 Correct 92 ms 1740 KB Output is correct
34 Correct 66 ms 1812 KB Output is correct
35 Correct 46 ms 1740 KB Output is correct
36 Correct 121 ms 2056 KB Output is correct
37 Correct 83 ms 1996 KB Output is correct
38 Correct 57 ms 2052 KB Output is correct
39 Correct 165 ms 2300 KB Output is correct
40 Correct 96 ms 2252 KB Output is correct
41 Correct 71 ms 2288 KB Output is correct
42 Correct 181 ms 2520 KB Output is correct
43 Correct 120 ms 2508 KB Output is correct
44 Correct 94 ms 2536 KB Output is correct
45 Correct 239 ms 2788 KB Output is correct
46 Correct 145 ms 2776 KB Output is correct
47 Correct 102 ms 2764 KB Output is correct
48 Correct 278 ms 3028 KB Output is correct
49 Correct 180 ms 3024 KB Output is correct
50 Correct 124 ms 3044 KB Output is correct
51 Correct 352 ms 3304 KB Output is correct
52 Correct 211 ms 3248 KB Output is correct
53 Correct 149 ms 3292 KB Output is correct
54 Correct 438 ms 3548 KB Output is correct
55 Correct 242 ms 3532 KB Output is correct
56 Correct 179 ms 3560 KB Output is correct
57 Correct 496 ms 3816 KB Output is correct
58 Correct 297 ms 3788 KB Output is correct
59 Correct 239 ms 3828 KB Output is correct
60 Correct 533 ms 4084 KB Output is correct
61 Correct 333 ms 4088 KB Output is correct
62 Correct 255 ms 4120 KB Output is correct
63 Correct 381 ms 4096 KB Output is correct
64 Correct 367 ms 4092 KB Output is correct
65 Correct 355 ms 4092 KB Output is correct
66 Correct 383 ms 4088 KB Output is correct
67 Correct 358 ms 4088 KB Output is correct
68 Correct 393 ms 4164 KB Output is correct
69 Correct 417 ms 4160 KB Output is correct
70 Correct 488 ms 4172 KB Output is correct
71 Correct 439 ms 4148 KB Output is correct
72 Execution timed out 1095 ms 4044 KB Time limit exceeded
73 Incorrect 366 ms 4628 KB Output isn't correct
74 Correct 357 ms 4916 KB Output is correct
75 Correct 415 ms 4628 KB Output is correct
76 Correct 366 ms 4660 KB Output is correct
77 Correct 427 ms 4648 KB Output is correct
78 Correct 368 ms 4580 KB Output is correct
79 Correct 367 ms 4584 KB Output is correct
80 Correct 361 ms 4604 KB Output is correct
81 Correct 350 ms 4680 KB Output is correct
82 Correct 412 ms 4584 KB Output is correct
83 Correct 390 ms 4492 KB Output is correct
84 Correct 355 ms 4508 KB Output is correct
85 Correct 422 ms 4496 KB Output is correct
86 Correct 342 ms 4528 KB Output is correct
87 Correct 369 ms 4508 KB Output is correct
88 Correct 368 ms 4408 KB Output is correct
89 Correct 385 ms 4424 KB Output is correct
90 Correct 401 ms 4428 KB Output is correct
91 Correct 348 ms 4436 KB Output is correct
92 Correct 375 ms 4428 KB Output is correct