oj.uz

Submission #969055

# Submission time Handle Problem Language Result Execution time Memory
969055 2024-04-24T12:41:43 Z Boomyday Mecho (IOI09_mecho) C++17
100 / 100
 559 ms 6224 KB 
#include <bits/stdc++.h>
using namespace std;

#define f first
#define s second

using ii = pair<int,int>;
int N, S;

vector<int> dx = {1,0,-1,0}, dy = {0,1,0,-1};
pair<int,int> p_st, p_en;

bool in_bounds(pair<int,int> p){
    return 0 <= p.f && p.f < N && 0 <= p.s && p.s < N;
}



queue<ii> push_bees(vector<vector<int>>& G, queue<ii> Q){

    queue<ii> Q2;
    while (!Q.empty()){
        ii cur = Q.front(); Q.pop();
        for (int d=0;d<4;++d){
            ii nxt = {cur.f+dx[d],cur.s+dy[d]};
            if (!in_bounds(nxt)) continue;
            if (nxt == p_en) continue;
            if (G[nxt.f][nxt.s] == 0 || (G[nxt.f][nxt.s] == 2)){
                G[nxt.f][nxt.s] = -1;
                Q2.push(nxt);
            }
        }
    }
    return Q2;
}

queue<ii> push_mecho(vector<vector<int>>& G, queue<ii> Q){

    queue<ii> Q2;
    while (!Q.empty()){
        ii cur = Q.front(); Q.pop();
        if (G[cur.f][cur.s] != 2) continue;
        for (int d=0;d<4;++d){
            ii nxt = {cur.f+dx[d],cur.s+dy[d]};
            if (!in_bounds(nxt)) continue;
            if (G[nxt.f][nxt.s] == 0){
                G[nxt.f][nxt.s] = 2;
                Q2.push(nxt);
            }
        }
    }
    return Q2;
}
bool good(int t, vector<vector<int>> G){
    queue<ii> Q; // bees
    for(int i=0;i<N;++i) for(int j=0;j<N;++j) if (G[i][j] == -1) Q.push({i,j});

    for(int i=0;i<t;++i) Q = push_bees(G,Q);
    queue<ii> Q2; Q2.push(p_st); // mecho

    while(!Q2.empty()){

        for (int i=0;i<S;++i) Q2 = push_mecho(G,Q2);
        Q = push_bees(G,Q);
    }

    return G[p_en.f][p_en.s] == 2;

}

int main(){
    cin >> N >> S;
    vector<vector<int>> G(N,vector<int>(N,0));

    for(int i=0;i<N;++i){
        string st;
        cin >> st;
        for(int j=0;j<N;++j){
            if (st[j]=='T'){
                G[i][j] = 1;
            }
            if (st[j] == 'G'){
                G[i][j] = 0;
            }
            if (st[j] == 'M'){
                p_st = {i,j};
                G[i][j] = 2;
            }
            if (st[j] == 'D'){
                p_en = {i,j};
                G[i][j] = 0;
            }
            if (st[j] == 'H'){
                G[i][j] = -1;
            }
        }
    }


    if (!good(0,G)){
        cout << -1 << endl; return 0;
    }


    int lo = 0, hi = 1e6;
    while (lo < hi){

        int mid = (lo+hi+1)/2;

        if (good(mid,G)){
            lo = mid;
        }
        else {
            hi = mid-1;
        }
    }
    cout << lo << endl;
}

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 348 KB Output is correct
2 Correct 64 ms 344 KB Output is correct
3 Correct 69 ms 408 KB Output is correct
4 Correct 80 ms 416 KB Output is correct
5 Correct 83 ms 348 KB Output is correct
6 Correct 66 ms 348 KB Output is correct
7 Correct 346 ms 5720 KB Output is correct
8 Correct 0 ms 344 KB Output is correct
9 Correct 87 ms 416 KB Output is correct
10 Correct 65 ms 348 KB Output is correct
11 Correct 67 ms 412 KB Output is correct
12 Correct 66 ms 344 KB Output is correct
13 Correct 69 ms 440 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 69 ms 416 KB Output is correct
16 Correct 66 ms 416 KB Output is correct
17 Correct 68 ms 344 KB Output is correct
18 Correct 67 ms 348 KB Output is correct
19 Correct 81 ms 348 KB Output is correct
20 Correct 66 ms 348 KB Output is correct
21 Correct 68 ms 348 KB Output is correct
22 Correct 76 ms 348 KB Output is correct
23 Correct 68 ms 432 KB Output is correct
24 Correct 68 ms 436 KB Output is correct
25 Correct 67 ms 440 KB Output is correct
26 Correct 67 ms 348 KB Output is correct
27 Correct 67 ms 448 KB Output is correct
28 Correct 88 ms 444 KB Output is correct
29 Correct 70 ms 344 KB Output is correct
30 Correct 68 ms 452 KB Output is correct
31 Correct 69 ms 344 KB Output is correct
32 Correct 67 ms 344 KB Output is correct
33 Correct 151 ms 1372 KB Output is correct
34 Correct 121 ms 1392 KB Output is correct
35 Correct 98 ms 1372 KB Output is correct
36 Correct 191 ms 1628 KB Output is correct
37 Correct 138 ms 1628 KB Output is correct
38 Correct 116 ms 1704 KB Output is correct
39 Correct 208 ms 1884 KB Output is correct
40 Correct 152 ms 1884 KB Output is correct
41 Correct 121 ms 2024 KB Output is correct
42 Correct 300 ms 2640 KB Output is correct
43 Correct 174 ms 2392 KB Output is correct
44 Correct 136 ms 2392 KB Output is correct
45 Correct 288 ms 2812 KB Output is correct
46 Correct 200 ms 2648 KB Output is correct
47 Correct 156 ms 2648 KB Output is correct
48 Correct 334 ms 3164 KB Output is correct
49 Correct 227 ms 3276 KB Output is correct
50 Correct 183 ms 3416 KB Output is correct
51 Correct 385 ms 3676 KB Output is correct
52 Correct 276 ms 3760 KB Output is correct
53 Correct 196 ms 3644 KB Output is correct
54 Correct 445 ms 4188 KB Output is correct
55 Correct 292 ms 4184 KB Output is correct
56 Correct 252 ms 4188 KB Output is correct
57 Correct 499 ms 4944 KB Output is correct
58 Correct 319 ms 4700 KB Output is correct
59 Correct 227 ms 4880 KB Output is correct
60 Correct 559 ms 5484 KB Output is correct
61 Correct 354 ms 5480 KB Output is correct
62 Correct 249 ms 5468 KB Output is correct
63 Correct 316 ms 5536 KB Output is correct
64 Correct 288 ms 5512 KB Output is correct
65 Correct 306 ms 5484 KB Output is correct
66 Correct 321 ms 5468 KB Output is correct
67 Correct 23 ms 5468 KB Output is correct
68 Correct 323 ms 5552 KB Output is correct
69 Correct 298 ms 5564 KB Output is correct
70 Correct 304 ms 5464 KB Output is correct
71 Correct 300 ms 5552 KB Output is correct
72 Correct 367 ms 5556 KB Output is correct
73 Correct 335 ms 6224 KB Output is correct
74 Correct 341 ms 6044 KB Output is correct
75 Correct 350 ms 6068 KB Output is correct
76 Correct 349 ms 6068 KB Output is correct
77 Correct 338 ms 6036 KB Output is correct
78 Correct 29 ms 5780 KB Output is correct
79 Correct 387 ms 6144 KB Output is correct
80 Correct 339 ms 5976 KB Output is correct
81 Correct 341 ms 6016 KB Output is correct
82 Correct 343 ms 6024 KB Output is correct
83 Correct 329 ms 6176 KB Output is correct
84 Correct 362 ms 5920 KB Output is correct
85 Correct 353 ms 5724 KB Output is correct
86 Correct 345 ms 5720 KB Output is correct
87 Correct 346 ms 5928 KB Output is correct
88 Correct 325 ms 5824 KB Output is correct
89 Correct 348 ms 5968 KB Output is correct
90 Correct 339 ms 5832 KB Output is correct
91 Correct 355 ms 5840 KB Output is correct
92 Correct 329 ms 5720 KB Output is correct