oj.uz

Submission #228801

# Submission time Handle Problem Language Result Execution time Memory
228801 2020-05-02T16:10:15 Z osaaateiasavtnl Mecho (IOI09_mecho) C++14
100 / 100
 243 ms 17232 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();
        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();
    int l = -1, r = INF;
    while (l < r - 1) {
        int m = (l + r) >> 1;
        if (can(m))
            l = m;
        else
            r = m;
    }   
    cout << l << endl;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 16256 KB Output is correct
2 Correct 15 ms 16256 KB Output is correct
3 Correct 13 ms 16256 KB Output is correct
4 Correct 16 ms 16256 KB Output is correct
5 Correct 13 ms 16256 KB Output is correct
6 Correct 16 ms 16256 KB Output is correct
7 Correct 187 ms 17056 KB Output is correct
8 Correct 14 ms 16256 KB Output is correct
9 Correct 16 ms 16256 KB Output is correct
10 Correct 14 ms 16256 KB Output is correct
11 Correct 13 ms 16256 KB Output is correct
12 Correct 17 ms 16256 KB Output is correct
13 Correct 13 ms 16256 KB Output is correct
14 Correct 17 ms 16256 KB Output is correct
15 Correct 18 ms 16256 KB Output is correct
16 Correct 16 ms 16256 KB Output is correct
17 Correct 20 ms 16256 KB Output is correct
18 Correct 15 ms 16256 KB Output is correct
19 Correct 17 ms 16256 KB Output is correct
20 Correct 16 ms 16256 KB Output is correct
21 Correct 18 ms 16256 KB Output is correct
22 Correct 14 ms 16256 KB Output is correct
23 Correct 19 ms 16256 KB Output is correct
24 Correct 17 ms 16256 KB Output is correct
25 Correct 21 ms 16256 KB Output is correct
26 Correct 19 ms 16256 KB Output is correct
27 Correct 16 ms 16256 KB Output is correct
28 Correct 16 ms 16256 KB Output is correct
29 Correct 19 ms 16256 KB Output is correct
30 Correct 19 ms 16256 KB Output is correct
31 Correct 20 ms 16256 KB Output is correct
32 Correct 18 ms 16256 KB Output is correct
33 Correct 23 ms 16384 KB Output is correct
34 Correct 20 ms 16384 KB Output is correct
35 Correct 48 ms 16384 KB Output is correct
36 Correct 22 ms 16384 KB Output is correct
37 Correct 19 ms 16384 KB Output is correct
38 Correct 66 ms 16384 KB Output is correct
39 Correct 24 ms 16512 KB Output is correct
40 Correct 22 ms 16384 KB Output is correct
41 Correct 77 ms 16512 KB Output is correct
42 Correct 23 ms 16544 KB Output is correct
43 Correct 20 ms 16512 KB Output is correct
44 Correct 97 ms 16632 KB Output is correct
45 Correct 27 ms 16512 KB Output is correct
46 Correct 24 ms 16512 KB Output is correct
47 Correct 107 ms 16512 KB Output is correct
48 Correct 31 ms 16640 KB Output is correct
49 Correct 32 ms 16760 KB Output is correct
50 Correct 130 ms 16640 KB Output is correct
51 Correct 29 ms 16640 KB Output is correct
52 Correct 28 ms 16640 KB Output is correct
53 Correct 161 ms 16760 KB Output is correct
54 Correct 30 ms 16768 KB Output is correct
55 Correct 30 ms 16768 KB Output is correct
56 Correct 167 ms 16768 KB Output is correct
57 Correct 32 ms 16768 KB Output is correct
58 Correct 26 ms 16896 KB Output is correct
59 Correct 203 ms 16768 KB Output is correct
60 Correct 32 ms 16896 KB Output is correct
61 Correct 35 ms 16896 KB Output is correct
62 Correct 225 ms 16896 KB Output is correct
63 Correct 148 ms 17012 KB Output is correct
64 Correct 243 ms 16960 KB Output is correct
65 Correct 239 ms 17016 KB Output is correct
66 Correct 163 ms 16892 KB Output is correct
67 Correct 158 ms 16888 KB Output is correct
68 Correct 71 ms 17008 KB Output is correct
69 Correct 71 ms 16888 KB Output is correct
70 Correct 49 ms 16896 KB Output is correct
71 Correct 55 ms 16888 KB Output is correct
72 Correct 48 ms 16892 KB Output is correct
73 Correct 76 ms 17204 KB Output is correct
74 Correct 113 ms 16972 KB Output is correct
75 Correct 136 ms 16972 KB Output is correct
76 Correct 109 ms 16968 KB Output is correct
77 Correct 119 ms 16972 KB Output is correct
78 Correct 138 ms 17032 KB Output is correct
79 Correct 92 ms 17040 KB Output is correct
80 Correct 112 ms 17028 KB Output is correct
81 Correct 127 ms 17028 KB Output is correct
82 Correct 101 ms 17032 KB Output is correct
83 Correct 184 ms 16980 KB Output is correct
84 Correct 140 ms 17232 KB Output is correct
85 Correct 150 ms 16980 KB Output is correct
86 Correct 159 ms 16988 KB Output is correct
87 Correct 178 ms 17108 KB Output is correct
88 Correct 181 ms 17076 KB Output is correct
89 Correct 167 ms 17076 KB Output is correct
90 Correct 174 ms 16948 KB Output is correct
91 Correct 168 ms 17076 KB Output is correct
92 Correct 165 ms 17076 KB Output is correct