oj.uz

Submission #969052

# Submission time Handle Problem Language Result Execution time Memory
969052 2024-04-24T12:37:40 Z Boomyday Mecho (IOI09_mecho) C++17
84 / 100
 631 ms 6272 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 (G[nxt.f][nxt.s] == 0 || (G[nxt.f][nxt.s] == 2 && nxt != p_en)){
                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
84.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 348 KB Output is correct
2 Incorrect 66 ms 348 KB Output isn't correct
3 Correct 72 ms 596 KB Output is correct
4 Incorrect 67 ms 348 KB Output isn't correct
5 Correct 66 ms 408 KB Output is correct
6 Incorrect 65 ms 348 KB Output isn't correct
7 Incorrect 378 ms 5732 KB Output isn't correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 66 ms 348 KB Output is correct
10 Correct 68 ms 348 KB Output is correct
11 Correct 67 ms 348 KB Output is correct
12 Incorrect 72 ms 348 KB Output isn't correct
13 Correct 73 ms 440 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 66 ms 416 KB Output is correct
16 Correct 73 ms 348 KB Output is correct
17 Correct 66 ms 344 KB Output is correct
18 Correct 66 ms 348 KB Output is correct
19 Correct 66 ms 348 KB Output is correct
20 Correct 65 ms 424 KB Output is correct
21 Correct 67 ms 348 KB Output is correct
22 Correct 68 ms 344 KB Output is correct
23 Correct 67 ms 348 KB Output is correct
24 Correct 69 ms 344 KB Output is correct
25 Correct 69 ms 344 KB Output is correct
26 Correct 66 ms 348 KB Output is correct
27 Correct 68 ms 348 KB Output is correct
28 Correct 67 ms 348 KB Output is correct
29 Correct 71 ms 348 KB Output is correct
30 Correct 71 ms 452 KB Output is correct
31 Correct 69 ms 460 KB Output is correct
32 Correct 83 ms 460 KB Output is correct
33 Correct 149 ms 1368 KB Output is correct
34 Correct 121 ms 1616 KB Output is correct
35 Correct 99 ms 1368 KB Output is correct
36 Correct 178 ms 1628 KB Output is correct
37 Correct 136 ms 1628 KB Output is correct
38 Correct 125 ms 1696 KB Output is correct
39 Correct 212 ms 1880 KB Output is correct
40 Correct 151 ms 1880 KB Output is correct
41 Correct 123 ms 2028 KB Output is correct
42 Correct 248 ms 2408 KB Output is correct
43 Correct 178 ms 2392 KB Output is correct
44 Correct 144 ms 2396 KB Output is correct
45 Correct 309 ms 2896 KB Output is correct
46 Correct 198 ms 2812 KB Output is correct
47 Correct 156 ms 2652 KB Output is correct
48 Correct 341 ms 3276 KB Output is correct
49 Correct 249 ms 3276 KB Output is correct
50 Correct 183 ms 3408 KB Output is correct
51 Correct 389 ms 3760 KB Output is correct
52 Correct 270 ms 3772 KB Output is correct
53 Correct 190 ms 3768 KB Output is correct
54 Correct 517 ms 4436 KB Output is correct
55 Correct 319 ms 4300 KB Output is correct
56 Correct 225 ms 4316 KB Output is correct
57 Correct 540 ms 4860 KB Output is correct
58 Correct 329 ms 4856 KB Output is correct
59 Correct 249 ms 4872 KB Output is correct
60 Correct 631 ms 5488 KB Output is correct
61 Correct 359 ms 5468 KB Output is correct
62 Correct 249 ms 5464 KB Output is correct
63 Correct 290 ms 5492 KB Output is correct
64 Correct 292 ms 5464 KB Output is correct
65 Correct 308 ms 5716 KB Output is correct
66 Correct 320 ms 5488 KB Output is correct
67 Correct 23 ms 5468 KB Output is correct
68 Correct 322 ms 5560 KB Output is correct
69 Correct 276 ms 5468 KB Output is correct
70 Correct 301 ms 5556 KB Output is correct
71 Correct 292 ms 5716 KB Output is correct
72 Correct 359 ms 5464 KB Output is correct
73 Correct 311 ms 6084 KB Output is correct
74 Correct 331 ms 6064 KB Output is correct
75 Correct 370 ms 6200 KB Output is correct
76 Correct 337 ms 6076 KB Output is correct
77 Correct 352 ms 6264 KB Output is correct
78 Correct 24 ms 5980 KB Output is correct
79 Correct 337 ms 5996 KB Output is correct
80 Correct 360 ms 6272 KB Output is correct
81 Correct 358 ms 5976 KB Output is correct
82 Correct 352 ms 6024 KB Output is correct
83 Correct 335 ms 5896 KB Output is correct
84 Correct 351 ms 5924 KB Output is correct
85 Correct 338 ms 5720 KB Output is correct
86 Correct 370 ms 5928 KB Output is correct
87 Correct 341 ms 5724 KB Output is correct
88 Correct 358 ms 5840 KB Output is correct
89 Correct 331 ms 5824 KB Output is correct
90 Correct 353 ms 5888 KB Output is correct
91 Correct 332 ms 5724 KB Output is correct
92 Correct 330 ms 5724 KB Output is correct