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Submission #470711

# Submission time Handle Problem Language Result Execution time Memory
470711 2021-09-05T07:55:31 Z dooompy Mecho (IOI09_mecho) C++17
84 / 100
 228 ms 5572 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 (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;
        }

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


        seen[cur.x][cur.y] = true;

        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 || bees[newx][newy] < cur.time || tree[newx][newy] || seen[newx][newy]) continue;

            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]) 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
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 1228 KB Output is correct
2 Incorrect 2 ms 1228 KB Output isn't correct
3 Correct 2 ms 1228 KB Output is correct
4 Incorrect 2 ms 1228 KB Output isn't correct
5 Correct 2 ms 1228 KB Output is correct
6 Incorrect 2 ms 1356 KB Output isn't correct
7 Incorrect 158 ms 5220 KB Output isn't correct
8 Correct 2 ms 1356 KB Output is correct
9 Correct 2 ms 1356 KB Output is correct
10 Correct 2 ms 1456 KB Output is correct
11 Correct 2 ms 1356 KB Output is correct
12 Incorrect 2 ms 1484 KB Output isn't correct
13 Correct 2 ms 1484 KB Output is correct
14 Correct 2 ms 1484 KB Output is correct
15 Correct 2 ms 1356 KB Output is correct
16 Correct 2 ms 1356 KB Output is correct
17 Correct 2 ms 1428 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 2 ms 1612 KB Output is correct
29 Correct 2 ms 1612 KB Output is correct
30 Correct 2 ms 1612 KB Output is correct
31 Correct 3 ms 1612 KB Output is correct
32 Correct 2 ms 1612 KB Output is correct
33 Correct 7 ms 2936 KB Output is correct
34 Correct 7 ms 3032 KB Output is correct
35 Correct 40 ms 3036 KB Output is correct
36 Correct 8 ms 3276 KB Output is correct
37 Correct 8 ms 3276 KB Output is correct
38 Correct 41 ms 3280 KB Output is correct
39 Correct 9 ms 3504 KB Output is correct
40 Correct 9 ms 3404 KB Output is correct
41 Correct 54 ms 3532 KB Output is correct
42 Correct 12 ms 3660 KB Output is correct
43 Correct 10 ms 3764 KB Output is correct
44 Correct 70 ms 3768 KB Output is correct
45 Correct 12 ms 3988 KB Output is correct
46 Correct 12 ms 3916 KB Output is correct
47 Correct 84 ms 3940 KB Output is correct
48 Correct 14 ms 4236 KB Output is correct
49 Correct 14 ms 4256 KB Output is correct
50 Correct 99 ms 4252 KB Output is correct
51 Correct 16 ms 4468 KB Output is correct
52 Correct 16 ms 4488 KB Output is correct
53 Correct 118 ms 4624 KB Output is correct
54 Correct 17 ms 4684 KB Output is correct
55 Correct 18 ms 4720 KB Output is correct
56 Correct 137 ms 4672 KB Output is correct
57 Correct 20 ms 4956 KB Output is correct
58 Correct 20 ms 4904 KB Output is correct
59 Correct 158 ms 5000 KB Output is correct
60 Correct 23 ms 5176 KB Output is correct
61 Correct 22 ms 5188 KB Output is correct
62 Correct 180 ms 5144 KB Output is correct
63 Correct 127 ms 5156 KB Output is correct
64 Correct 228 ms 5228 KB Output is correct
65 Correct 213 ms 5188 KB Output is correct
66 Correct 145 ms 5228 KB Output is correct
67 Correct 140 ms 5188 KB Output is correct
68 Correct 62 ms 5236 KB Output is correct
69 Correct 59 ms 5168 KB Output is correct
70 Correct 42 ms 5188 KB Output is correct
71 Correct 45 ms 5216 KB Output is correct
72 Correct 48 ms 5216 KB Output is correct
73 Correct 56 ms 5396 KB Output is correct
74 Correct 94 ms 5396 KB Output is correct
75 Correct 108 ms 5548 KB Output is correct
76 Correct 92 ms 5508 KB Output is correct
77 Correct 101 ms 5444 KB Output is correct
78 Correct 112 ms 5424 KB Output is correct
79 Correct 82 ms 5480 KB Output is correct
80 Correct 111 ms 5572 KB Output is correct
81 Correct 111 ms 5476 KB Output is correct
82 Correct 89 ms 5448 KB Output is correct
83 Correct 123 ms 5452 KB Output is correct
84 Correct 130 ms 5432 KB Output is correct
85 Correct 108 ms 5436 KB Output is correct
86 Correct 122 ms 5440 KB Output is correct
87 Correct 128 ms 5440 KB Output is correct
88 Correct 127 ms 5460 KB Output is correct
89 Correct 143 ms 5384 KB Output is correct
90 Correct 135 ms 5356 KB Output is correct
91 Correct 128 ms 5276 KB Output is correct
92 Correct 130 ms 5316 KB Output is correct