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Submission #470709

# Submission time Handle Problem Language Result Execution time Memory
470709 2021-09-05T07:51:29 Z dooompy Mecho (IOI09_mecho) C++17
73 / 100
 213 ms 5548 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;

    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 (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
73.0 / 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 145 ms 5240 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 1356 KB Output is correct
11 Correct 2 ms 1356 KB Output is correct
12 Incorrect 2 ms 1484 KB Output isn't correct
13 Incorrect 2 ms 1484 KB Output isn't 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 1392 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 3 ms 1484 KB Output is correct
24 Correct 2 ms 1484 KB Output is correct
25 Correct 3 ms 1604 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 2 ms 1612 KB Output is correct
32 Correct 3 ms 1612 KB Output is correct
33 Correct 6 ms 3020 KB Output is correct
34 Correct 6 ms 3000 KB Output is correct
35 Correct 32 ms 3020 KB Output is correct
36 Correct 8 ms 3276 KB Output is correct
37 Correct 8 ms 3276 KB Output is correct
38 Correct 42 ms 3276 KB Output is correct
39 Correct 9 ms 3532 KB Output is correct
40 Correct 10 ms 3404 KB Output is correct
41 Correct 62 ms 3532 KB Output is correct
42 Correct 13 ms 3696 KB Output is correct
43 Correct 12 ms 3728 KB Output is correct
44 Correct 69 ms 3660 KB Output is correct
45 Correct 13 ms 3916 KB Output is correct
46 Correct 12 ms 4000 KB Output is correct
47 Correct 84 ms 4024 KB Output is correct
48 Correct 16 ms 4248 KB Output is correct
49 Correct 14 ms 4172 KB Output is correct
50 Correct 105 ms 4252 KB Output is correct
51 Correct 16 ms 4504 KB Output is correct
52 Correct 16 ms 4428 KB Output is correct
53 Correct 120 ms 4500 KB Output is correct
54 Correct 17 ms 4684 KB Output is correct
55 Correct 20 ms 4760 KB Output is correct
56 Correct 151 ms 4676 KB Output is correct
57 Correct 19 ms 4980 KB Output is correct
58 Correct 19 ms 4940 KB Output is correct
59 Correct 161 ms 5000 KB Output is correct
60 Correct 26 ms 5232 KB Output is correct
61 Correct 28 ms 5192 KB Output is correct
62 Correct 185 ms 5276 KB Output is correct
63 Correct 127 ms 5188 KB Output is correct
64 Correct 213 ms 5232 KB Output is correct
65 Correct 209 ms 5232 KB Output is correct
66 Correct 146 ms 5188 KB Output is correct
67 Correct 128 ms 5232 KB Output is correct
68 Correct 61 ms 5176 KB Output is correct
69 Correct 61 ms 5188 KB Output is correct
70 Correct 45 ms 5164 KB Output is correct
71 Correct 45 ms 5188 KB Output is correct
72 Incorrect 41 ms 5236 KB Output isn't correct
73 Incorrect 46 ms 5548 KB Output isn't correct
74 Correct 96 ms 5420 KB Output is correct
75 Correct 108 ms 5484 KB Output is correct
76 Correct 92 ms 5436 KB Output is correct
77 Correct 107 ms 5408 KB Output is correct
78 Correct 117 ms 5404 KB Output is correct
79 Correct 88 ms 5444 KB Output is correct
80 Correct 100 ms 5404 KB Output is correct
81 Correct 113 ms 5476 KB Output is correct
82 Correct 91 ms 5452 KB Output is correct
83 Correct 142 ms 5436 KB Output is correct
84 Correct 127 ms 5436 KB Output is correct
85 Correct 109 ms 5316 KB Output is correct
86 Correct 120 ms 5392 KB Output is correct
87 Correct 117 ms 5396 KB Output is correct
88 Correct 128 ms 5372 KB Output is correct
89 Correct 127 ms 5308 KB Output is correct
90 Correct 135 ms 5388 KB Output is correct
91 Correct 129 ms 5316 KB Output is correct
92 Correct 138 ms 5400 KB Output is correct