oj.uz

Submission #228799

# Submission time Handle Problem Language Result Execution time Memory
228799 2020-05-02T16:08:42 Z osaaateiasavtnl Mecho (IOI09_mecho) C++14
73 / 100
 236 ms 17804 KB 
#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcount
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
const int N = 1007, INF = 1e9 + 7;
int n, S;
string a[N];
int bee_dist[N][N];
bool can_bee(int i, int j) {
    return 0 <= i && i < n && 0 <= j && j < n && (a[i][j] == 'G' || a[i][j] == 'M' || a[i][j] == 'H');
}   
vector <ii> v = { {0, -1}, {0, 1}, {-1, 0}, {1, 0} };
void bfs1() {
    for (int i = 0; i < N; ++i) {
        for (int j = 0; j < N; ++j) {   
            bee_dist[i][j] = INF;
        }
    }
    queue <ii> q;   
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            if (a[i][j] == 'H') {
                bee_dist[i][j] = 0;
                q.push(mp(i, j));
            }   
        }   
    }   
    while (q.size()) {
        auto p = q.front(); q.pop();
        for (auto e : v) {
            int x = p.f + e.f, y = p.s + e.s;
            if (can_bee(x, y) && bee_dist[p.f][p.s] + 1 < bee_dist[x][y]) {
                bee_dist[x][y] = bee_dist[p.f][p.s] + 1;
                q.push(mp(x, y));
            }   
        }   
    }   
}   
bool can_bear(int i, int j, int t, int m) {
    t = t / S;
    return 0 <= i && i < n && 0 <= j && j < n && (a[i][j] == 'G' || a[i][j] == 'M' || a[i][j] == 'D') && bee_dist[i][j] > t + m;
}   
int sx, sy;
int dist[N][N];
bool can(int m) {
    if (bee_dist[sx][sy] <= m)  
        return 0;
    for (int i = 0; i < N; ++i) {
        for (int j = 0; j < N; ++j) {
            dist[i][j] = INF;
        }   
    }   
    queue <ii> q;
    dist[sx][sy] = 0;
    q.push(mp(sx, sy));
    while (q.size()) {
        auto p = q.front(); q.pop();

        //cout << "point " << p.f << ' ' << p.s << endl;

        if (a[p.f][p.s] == 'D')
            return 1;
        for (auto e : v) {
            int x = p.f + e.f, y = p.s + e.s;
            if (can_bear(x, y, dist[p.f][p.s] + 1, m) && dist[p.f][p.s] + 1 < dist[x][y]) {
                dist[x][y] = dist[p.f][p.s] + 1;
                q.push(mp(x, y));
            }   
        }   
    }   
    return 0;
}   
signed main() {
    #ifdef HOME
    freopen("input.txt", "r", stdin);
    #else
    #define endl '\n'
    ios_base::sync_with_stdio(0); cin.tie(0);
    #endif
    cin >> n >> S;
    for (int i = 0; i < n; ++i)
        cin >> a[i];
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            if (a[i][j] == 'M') {
                sx = i;
                sy = j;
            }   
        }   
    }
    bfs1();
    #ifdef HOME
    for (int i = 0; i < n; ++i) {
        for (int j = 0; j < n; ++j) {
            cout << bee_dist[i][j] << ' ';
        }   
        cout << endl;
    }   
    #endif

    int l = -1, r = 2 * N;
    while (l < r - 1) {
        int m = (l + r) >> 1;
        if (can(m))
            l = m;
        else
            r = m;
    }   
    cout << l << endl;
}

Subtask #1
73.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 14 ms 16256 KB Output is correct
2 Correct 15 ms 16256 KB Output is correct
3 Correct 14 ms 16256 KB Output is correct
4 Correct 14 ms 16256 KB Output is correct
5 Correct 12 ms 16256 KB Output is correct
6 Correct 14 ms 16256 KB Output is correct
7 Correct 190 ms 17688 KB Output is correct
8 Correct 14 ms 16256 KB Output is correct
9 Correct 13 ms 16256 KB Output is correct
10 Correct 14 ms 16256 KB Output is correct
11 Correct 14 ms 16256 KB Output is correct
12 Correct 17 ms 16256 KB Output is correct
13 Correct 12 ms 16256 KB Output is correct
14 Correct 15 ms 16256 KB Output is correct
15 Correct 16 ms 16256 KB Output is correct
16 Correct 16 ms 16308 KB Output is correct
17 Correct 18 ms 16256 KB Output is correct
18 Correct 14 ms 16256 KB Output is correct
19 Correct 16 ms 16256 KB Output is correct
20 Correct 15 ms 16256 KB Output is correct
21 Correct 17 ms 16224 KB Output is correct
22 Correct 17 ms 16256 KB Output is correct
23 Correct 17 ms 16184 KB Output is correct
24 Correct 16 ms 16256 KB Output is correct
25 Correct 17 ms 16256 KB Output is correct
26 Correct 16 ms 16256 KB Output is correct
27 Incorrect 19 ms 16256 KB Output isn't correct
28 Correct 18 ms 16256 KB Output is correct
29 Incorrect 19 ms 16256 KB Output isn't correct
30 Correct 16 ms 16256 KB Output is correct
31 Incorrect 20 ms 16232 KB Output isn't correct
32 Correct 17 ms 16256 KB Output is correct
33 Incorrect 21 ms 16512 KB Output isn't correct
34 Incorrect 22 ms 16512 KB Output isn't correct
35 Correct 48 ms 16512 KB Output is correct
36 Incorrect 22 ms 16512 KB Output isn't correct
37 Incorrect 24 ms 16632 KB Output isn't correct
38 Correct 55 ms 16640 KB Output is correct
39 Incorrect 22 ms 16640 KB Output isn't correct
40 Incorrect 24 ms 16640 KB Output isn't correct
41 Correct 72 ms 16632 KB Output is correct
42 Incorrect 24 ms 16768 KB Output isn't correct
43 Incorrect 26 ms 16768 KB Output isn't correct
44 Correct 87 ms 16876 KB Output is correct
45 Incorrect 23 ms 16896 KB Output isn't correct
46 Incorrect 24 ms 16896 KB Output isn't correct
47 Correct 105 ms 16896 KB Output is correct
48 Incorrect 27 ms 17024 KB Output isn't correct
49 Incorrect 26 ms 17024 KB Output isn't correct
50 Correct 138 ms 17144 KB Output is correct
51 Incorrect 27 ms 17152 KB Output isn't correct
52 Incorrect 27 ms 17152 KB Output isn't correct
53 Correct 149 ms 17152 KB Output is correct
54 Incorrect 29 ms 17280 KB Output isn't correct
55 Incorrect 32 ms 17280 KB Output isn't correct
56 Correct 181 ms 17272 KB Output is correct
57 Incorrect 27 ms 17408 KB Output isn't correct
58 Incorrect 30 ms 17408 KB Output isn't correct
59 Correct 191 ms 17400 KB Output is correct
60 Incorrect 33 ms 17528 KB Output isn't correct
61 Incorrect 31 ms 17584 KB Output isn't correct
62 Correct 230 ms 17528 KB Output is correct
63 Correct 149 ms 17528 KB Output is correct
64 Correct 236 ms 17600 KB Output is correct
65 Correct 223 ms 17528 KB Output is correct
66 Correct 182 ms 17656 KB Output is correct
67 Correct 148 ms 17476 KB Output is correct
68 Correct 70 ms 17656 KB Output is correct
69 Correct 67 ms 17528 KB Output is correct
70 Correct 68 ms 17784 KB Output is correct
71 Correct 56 ms 17528 KB Output is correct
72 Correct 43 ms 17656 KB Output is correct
73 Correct 70 ms 17740 KB Output is correct
74 Correct 108 ms 17612 KB Output is correct
75 Correct 132 ms 17612 KB Output is correct
76 Correct 115 ms 17736 KB Output is correct
77 Correct 126 ms 17612 KB Output is correct
78 Correct 132 ms 17672 KB Output is correct
79 Correct 101 ms 17804 KB Output is correct
80 Correct 117 ms 17644 KB Output is correct
81 Correct 132 ms 17668 KB Output is correct
82 Correct 119 ms 17672 KB Output is correct
83 Correct 163 ms 17620 KB Output is correct
84 Correct 146 ms 17748 KB Output is correct
85 Correct 146 ms 17748 KB Output is correct
86 Correct 168 ms 17620 KB Output is correct
87 Correct 164 ms 17748 KB Output is correct
88 Correct 171 ms 17716 KB Output is correct
89 Correct 175 ms 17720 KB Output is correct
90 Correct 172 ms 17716 KB Output is correct
91 Correct 174 ms 17716 KB Output is correct
92 Correct 170 ms 17716 KB Output is correct