Submission #406421

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
406421	2021-05-17T14:56:41 Z	Falcon	Mecho (IOI09_mecho)	C++17	100 / 100	252 ms	6252 KB

mecho

#include <bits/stdc++.h>

#ifdef DEBUG
#include "debug.hpp"
#endif

using namespace std;

#define all(c)              (c).begin(), (c).end()
#define rall(c)             (c).rbegin(), (c).rend()
#define traverse(c, it)     for(auto it = (c).begin(); it != (c).end(); ++it)
#define rep(i, N)           for(int i = 0; i < (N); ++i)
#define rrep(i, N)          for(int i = (N) - 1; i >= 0; --i)
#define rep1(i, N)          for(int i = 1; i <= (N); ++i)
#define rep2(i, s, e)       for(int i = (s); i <= (e); ++i)

#ifdef DEBUG
#define debug(x...)         { \
                            ++dbg::depth; \
                            string dbg_vals = dbg::to_string(x); \
                            --dbg::depth; \
                            dbg::fprint(__func__, __LINE__, #x, dbg_vals); \
                            }

#define light_debug(x)      { \
                            dbg::light = true; \
                            dbg::dout << __func__ << ":" << __LINE__; \
                            dbg::dout << "  " << #x << " = " << x << endl; \
                            dbg::light = false; \
                            }

#else
#define debug(x...)         42
#define light_debug(x)      42
#endif


using ll = long long;

template<typename T>
inline T& ckmin(T& a, T b) { return a = a > b ? b : a; }

template<typename T>
inline T& ckmax(T& a, T b) { return a = a < b ? b : a; }


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int n, s; cin >> n >> s;
    vector<string> grid(n); rep(i, n) cin >> grid[i];

    vector<vector<int>> bee_dist = [&]{
        vector<vector<int>> dist(n, vector<int>(n, -1));

        queue<pair<int, int>> q;
        rep(i, n) rep(j, n) if(grid[i][j] == 'H')
            q.push({i, j}), dist[i][j] = 0;

        auto add = [&](int x, int y, int d) {
            if(x < 0 || y < 0 || x >= n || y >= n)
                return;
            
            if(grid[x][y] != 'G' && grid[x][y] != 'M')
                return;

            if(~dist[x][y])
                return;

            q.push({x, y});
            dist[x][y] = d + s; 
        };

        while(!q.empty()) {
            auto [i, j] = q.front(); q.pop();
            add(i + 1, j, dist[i][j]);
            add(i, j + 1, dist[i][j]);
            add(i - 1, j, dist[i][j]);
            add(i, j - 1, dist[i][j]);
        }

        return dist;
    }();

    auto check = [&](int t) {
        t = t * s;
        

        queue<pair<int, int>> q;
        vector<vector<int>> dist(n, vector<int>(n, -1));
        rep(i, n) rep(j, n) if(grid[i][j] == 'M') {
            if(~bee_dist[i][j] && bee_dist[i][j] <= t)
                return false;
            q.push({i, j});
            dist[i][j] = t;
        }

        auto add = [&](int x, int y, int d) {
            if(x < 0 || y < 0 || x >= n || y >= n)
                return;

            if(grid[x][y] != 'G' && grid[x][y] != 'D')
                return;

            if(~dist[x][y])
                return;
            
            if(~bee_dist[x][y] && d + 1 >= bee_dist[x][y])
                return;

            q.push({x, y});
            dist[x][y] = d + 1; 
        };

        while(!q.empty()) {
            auto [i, j] = q.front(); q.pop();
            if(grid[i][j] == 'D')
                return true;

            add(i + 1, j, dist[i][j]);
            add(i - 1, j, dist[i][j]);
            add(i, j + 1, dist[i][j]);
            add(i, j - 1, dist[i][j]);
        }

        return false;
     };

    if(!check(0))
        return cout << -1 << '\n', 0;

    int t{};
    for(int k{1 << __lg(n * n)}; k > 0; k >>= 1)
        if(t + k <= n * n && check(t + k))
            t += k;

    cout << t << '\n';
    
    
    #ifdef DEBUG
    dbg::dout << "\nExecution time: "
              << clock() * 1000 / CLOCKS_PER_SEC 
              << "ms" << endl;
    #endif
    return 0;
}

Subtask #1

100.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	1 ms	204 KB	Output is correct
4	Correct	1 ms	204 KB	Output is correct
5	Correct	1 ms	204 KB	Output is correct
6	Correct	1 ms	204 KB	Output is correct
7	Correct	152 ms	6096 KB	Output is correct
8	Correct	1 ms	204 KB	Output is correct
9	Correct	1 ms	204 KB	Output is correct
10	Correct	1 ms	204 KB	Output is correct
11	Correct	1 ms	204 KB	Output is correct
12	Correct	1 ms	332 KB	Output is correct
13	Correct	1 ms	332 KB	Output is correct
14	Correct	1 ms	456 KB	Output is correct
15	Correct	1 ms	204 KB	Output is correct
16	Correct	1 ms	204 KB	Output is correct
17	Correct	1 ms	204 KB	Output is correct
18	Correct	1 ms	204 KB	Output is correct
19	Correct	1 ms	204 KB	Output is correct
20	Correct	1 ms	204 KB	Output is correct
21	Correct	1 ms	204 KB	Output is correct
22	Correct	1 ms	204 KB	Output is correct
23	Correct	1 ms	332 KB	Output is correct
24	Correct	1 ms	332 KB	Output is correct
25	Correct	1 ms	332 KB	Output is correct
26	Correct	1 ms	332 KB	Output is correct
27	Correct	1 ms	332 KB	Output is correct
28	Correct	1 ms	332 KB	Output is correct
29	Correct	1 ms	332 KB	Output is correct
30	Correct	1 ms	332 KB	Output is correct
31	Correct	2 ms	332 KB	Output is correct
32	Correct	1 ms	332 KB	Output is correct
33	Correct	7 ms	1428 KB	Output is correct
34	Correct	8 ms	1428 KB	Output is correct
35	Correct	30 ms	1436 KB	Output is correct
36	Correct	9 ms	1784 KB	Output is correct
37	Correct	10 ms	1776 KB	Output is correct
38	Correct	37 ms	1776 KB	Output is correct
39	Correct	11 ms	2148 KB	Output is correct
40	Correct	15 ms	2160 KB	Output is correct
41	Correct	48 ms	2164 KB	Output is correct
42	Correct	14 ms	2640 KB	Output is correct
43	Correct	16 ms	2588 KB	Output is correct
44	Correct	58 ms	2584 KB	Output is correct
45	Correct	19 ms	3036 KB	Output is correct
46	Correct	19 ms	3100 KB	Output is correct
47	Correct	74 ms	3052 KB	Output is correct
48	Correct	21 ms	3640 KB	Output is correct
49	Correct	25 ms	3612 KB	Output is correct
50	Correct	99 ms	3720 KB	Output is correct
51	Correct	24 ms	4180 KB	Output is correct
52	Correct	27 ms	4164 KB	Output is correct
53	Correct	126 ms	4132 KB	Output is correct
54	Correct	29 ms	4812 KB	Output is correct
55	Correct	31 ms	4784 KB	Output is correct
56	Correct	144 ms	4772 KB	Output is correct
57	Correct	33 ms	5424 KB	Output is correct
58	Correct	37 ms	5424 KB	Output is correct
59	Correct	150 ms	5412 KB	Output is correct
60	Correct	36 ms	6132 KB	Output is correct
61	Correct	43 ms	6168 KB	Output is correct
62	Correct	178 ms	6116 KB	Output is correct
63	Correct	147 ms	6220 KB	Output is correct
64	Correct	252 ms	6088 KB	Output is correct
65	Correct	227 ms	6148 KB	Output is correct
66	Correct	194 ms	6092 KB	Output is correct
67	Correct	34 ms	5964 KB	Output is correct
68	Correct	81 ms	6220 KB	Output is correct
69	Correct	76 ms	6096 KB	Output is correct
70	Correct	88 ms	6104 KB	Output is correct
71	Correct	66 ms	6112 KB	Output is correct
72	Correct	56 ms	6100 KB	Output is correct
73	Correct	56 ms	6228 KB	Output is correct
74	Correct	99 ms	6120 KB	Output is correct
75	Correct	98 ms	6172 KB	Output is correct
76	Correct	107 ms	6168 KB	Output is correct
77	Correct	96 ms	6120 KB	Output is correct
78	Correct	32 ms	6080 KB	Output is correct
79	Correct	97 ms	6108 KB	Output is correct
80	Correct	101 ms	6200 KB	Output is correct
81	Correct	109 ms	6252 KB	Output is correct
82	Correct	102 ms	6120 KB	Output is correct
83	Correct	116 ms	6152 KB	Output is correct
84	Correct	111 ms	6096 KB	Output is correct
85	Correct	127 ms	6112 KB	Output is correct
86	Correct	119 ms	6132 KB	Output is correct
87	Correct	121 ms	6108 KB	Output is correct
88	Correct	117 ms	6128 KB	Output is correct
89	Correct	131 ms	6112 KB	Output is correct
90	Correct	129 ms	6120 KB	Output is correct
91	Correct	127 ms	6104 KB	Output is correct
92	Correct	145 ms	6128 KB	Output is correct