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Submission #470717

# Submission time Handle Problem Language Result Execution time Memory
470717 2021-09-05T08:08:51 Z dooompy Mecho (IOI09_mecho) C++17
100 / 100
 234 ms 5508 KB 
#include "bits/stdc++.h"

using namespace std;

using ll = long long;

bool tree[1005][1005];
int bees[1005][1005];
bool seen[1005][1005];
int n, s, sx, sy, dx, dy;

int mx[]{1, -1, 0, 0};
int my[]{0, 0, 1, -1};

struct bear {
    int x, y, time, move;
};

bool able(int time) {
    fill(&seen[0][0], &seen[0][0] + sizeof(seen) / sizeof(seen[0][0]), false);
    int curtime = time;

    // curtime can go into curtime+2 but must finish on curtime+3

    queue<bear> q;
    q.push({sx, sy, curtime+2, 0});
    seen[sx][sy] = true;

    if (bees[sx][sy] < curtime + 2) return false;

    while (!q.empty()) {
        auto cur = q.front(); q.pop();

        if (cur.x == dx && cur.y == dy) return true;


//        if (seen[cur.x][cur.y]) continue;

        if (cur.move == s) {
            cur.time++;
            if (bees[cur.x][cur.y] < cur.time) {
                continue;
            }
            cur.move = 0;
        }

        if (bees[cur.x][cur.y] < cur.time) {
            continue;
        }




        for (int i = 0; i < 4; i++) {
            int newx = cur.x + mx[i], newy = cur.y + my[i];

            if (newx < 0 || newx >= n || newy < 0 || newy >= n || ((newx != dx && newy != dy) && bees[newx][newy] < cur.time) || tree[newx][newy] || seen[newx][newy]) continue;
            seen[newx][newy] = true;

            q.push({newx, newy, cur.time, cur.move+1});
        }
    }

    return false;
}

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
//    freopen("", "r", stdin);
//    freopen("", "w", stdout);
    cin >> n >> s;
    queue<pair<int, int>> q;

    for (int i = 0; i < n; i++) {
        for (int j = 0; j < n; j++) {
            char c; cin>> c;
            if (c == 'T') tree[i][j] = true;
            if (c == 'M') {
                sx = i; sy = j;

            }
            if (c == 'D') {
                dx = i; dy = j;
            }
            if (c == 'H') {
                q.push({i, j});
                bees[i][j] = 1;
            }
        }
    }

    while (!q.empty()) {
        auto cur = q.front();
        q.pop();

        for (int i = 0; i < 4; i++) {
            int newx = cur.first + mx[i], newy = cur.second + my[i];
            if (newx < 0 || newx >= n || newy < 0 || newy >= n || bees[newx][newy] || tree[newx][newy] || (newx == dx && newy == dy)) continue;
            bees[newx][newy] = bees[cur.first][cur.second] + 1;
            q.push({newx, newy});
        }
    }

    int lo = 0, hi = 1e9;

    int biggest = -1;

    while (lo <= hi) {
        int mid = (lo + hi) / 2;
        if (able(mid)) {
            biggest = mid;
            lo = mid + 1;
        } else {
            hi = mid - 1;
        }
    }

    cout << biggest;

}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1228 KB Output is correct
2 Correct 2 ms 1228 KB Output is correct
3 Correct 2 ms 1228 KB Output is correct
4 Correct 2 ms 1228 KB Output is correct
5 Correct 2 ms 1228 KB Output is correct
6 Correct 2 ms 1300 KB Output is correct
7 Correct 108 ms 5220 KB Output is correct
8 Correct 2 ms 1356 KB Output is correct
9 Correct 3 ms 1356 KB Output is correct
10 Correct 2 ms 1356 KB Output is correct
11 Correct 2 ms 1356 KB Output is correct
12 Correct 2 ms 1484 KB Output is correct
13 Correct 2 ms 1484 KB Output is correct
14 Correct 2 ms 1484 KB Output is correct
15 Correct 2 ms 1404 KB Output is correct
16 Correct 2 ms 1356 KB Output is correct
17 Correct 2 ms 1356 KB Output is correct
18 Correct 2 ms 1356 KB Output is correct
19 Correct 2 ms 1356 KB Output is correct
20 Correct 2 ms 1356 KB Output is correct
21 Correct 2 ms 1484 KB Output is correct
22 Correct 2 ms 1484 KB Output is correct
23 Correct 2 ms 1484 KB Output is correct
24 Correct 2 ms 1484 KB Output is correct
25 Correct 2 ms 1484 KB Output is correct
26 Correct 2 ms 1484 KB Output is correct
27 Correct 2 ms 1612 KB Output is correct
28 Correct 3 ms 1568 KB Output is correct
29 Correct 2 ms 1612 KB Output is correct
30 Correct 3 ms 1612 KB Output is correct
31 Correct 2 ms 1612 KB Output is correct
32 Correct 4 ms 1612 KB Output is correct
33 Correct 6 ms 3040 KB Output is correct
34 Correct 7 ms 3020 KB Output is correct
35 Correct 28 ms 3040 KB Output is correct
36 Correct 7 ms 3256 KB Output is correct
37 Correct 8 ms 3216 KB Output is correct
38 Correct 35 ms 3276 KB Output is correct
39 Correct 9 ms 3528 KB Output is correct
40 Correct 9 ms 3416 KB Output is correct
41 Correct 44 ms 3448 KB Output is correct
42 Correct 10 ms 3684 KB Output is correct
43 Correct 12 ms 3660 KB Output is correct
44 Correct 66 ms 3660 KB Output is correct
45 Correct 12 ms 3932 KB Output is correct
46 Correct 12 ms 3972 KB Output is correct
47 Correct 70 ms 3928 KB Output is correct
48 Correct 14 ms 4160 KB Output is correct
49 Correct 14 ms 4172 KB Output is correct
50 Correct 84 ms 4308 KB Output is correct
51 Correct 16 ms 4428 KB Output is correct
52 Correct 17 ms 4432 KB Output is correct
53 Correct 143 ms 4496 KB Output is correct
54 Correct 19 ms 4664 KB Output is correct
55 Correct 18 ms 4684 KB Output is correct
56 Correct 114 ms 4728 KB Output is correct
57 Correct 22 ms 4980 KB Output is correct
58 Correct 20 ms 4904 KB Output is correct
59 Correct 143 ms 4920 KB Output is correct
60 Correct 22 ms 5128 KB Output is correct
61 Correct 22 ms 5136 KB Output is correct
62 Correct 164 ms 5236 KB Output is correct
63 Correct 134 ms 5168 KB Output is correct
64 Correct 234 ms 5304 KB Output is correct
65 Correct 212 ms 5228 KB Output is correct
66 Correct 158 ms 5188 KB Output is correct
67 Correct 145 ms 5232 KB Output is correct
68 Correct 64 ms 5256 KB Output is correct
69 Correct 64 ms 5256 KB Output is correct
70 Correct 48 ms 5176 KB Output is correct
71 Correct 49 ms 5188 KB Output is correct
72 Correct 44 ms 5192 KB Output is correct
73 Correct 52 ms 5444 KB Output is correct
74 Correct 82 ms 5508 KB Output is correct
75 Correct 90 ms 5500 KB Output is correct
76 Correct 82 ms 5436 KB Output is correct
77 Correct 87 ms 5452 KB Output is correct
78 Correct 94 ms 5480 KB Output is correct
79 Correct 71 ms 5452 KB Output is correct
80 Correct 82 ms 5476 KB Output is correct
81 Correct 90 ms 5476 KB Output is correct
82 Correct 76 ms 5364 KB Output is correct
83 Correct 104 ms 5500 KB Output is correct
84 Correct 91 ms 5504 KB Output is correct
85 Correct 97 ms 5316 KB Output is correct
86 Correct 104 ms 5440 KB Output is correct
87 Correct 98 ms 5412 KB Output is correct
88 Correct 112 ms 5504 KB Output is correct
89 Correct 112 ms 5316 KB Output is correct
90 Correct 112 ms 5440 KB Output is correct
91 Correct 105 ms 5452 KB Output is correct
92 Correct 109 ms 5340 KB Output is correct