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Submission #1094686

# Submission time Handle Problem Language Result Execution time Memory
1094686 2024-09-30T09:47:17 Z akamizane Mecho (IOI09_mecho) C++17
60 / 100
 190 ms 6920 KB 
#include<bits/stdc++.h>
 
using namespace std;
 
using ll = long long;
using pii = pair<int,long long>;
using ld = long double;
 
#define el cout << '\n'
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define FOR(i, a, b) for (int i = (a); i <= (b); i++)
#define FOD(i, a, b) for (int i = (a); i >= (b); i--)
#define REP(i, n) for (int i = 0; i < (n); i++)
template <class T1, class T2>bool chmax(T1 &a, T2 b){if (a < b) {a = b; return true;}return false;}
template <class T1, class T2>bool chmin(T1 &a, T2 b){if (a > b) {a = b; return true;}return false;}
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
 
const ll mod = 1e9 + 7;

void solve(){
    int n, k;
    cin >> n >> k;
    string s[n];
    REP(i, n){
        cin >> s[i];
    }
    pii start, des;
    vector<vector<int>> dis(n, vector<int> (n ,1e9));
    queue<pii> q;
    REP(i, n){
        REP(j, n){
            if (s[i][j] == 'M'){
                start = {i, j};
            }
            if (s[i][j] == 'D'){
                des = {i, j};
            }
            if (s[i][j] == 'H'){
                q.push({i, j});
                dis[i][j] = 0;
            }
        }
    }
    int dx[4] = {0, 0, -1, 1};
    int dy[4] = {-1, 1, 0, 0};
    while(q.size()){
        auto [x, y] = q.front();
        q.pop();
        for (int i = 0; i < 4; i++){
            int a = x + dx[i], b = y + dy[i];
            if (a < 0 || a >= n || b < 0 || b >= n) continue;
            if (s[a][b] == 'T' || s[a][b] == 'D') continue;
            if (dis[x][y] + 1 < dis[a][b]){
                dis[a][b] = dis[x][y] + 1;
                q.push({a, b});
            } 
        }
    }
    // REP(i, n){
    //     REP(j, n){
    //         cerr << dis[i][j] << " ";
    //     }
    //     cerr << '\n';
    // }
    // cerr << '\n';
    auto check = [&](int m){
    queue<pii> que;
    que.push(start);
    vector<vector<int>> dis2(n, vector<int> (n, 1e9));
    dis2[start.fi][start.se] = 0;
    while(que.size()){
        auto [x, y] = que.front();
        que.pop();
        if (x == des.fi && y == des.se) break;
        for (int i = 0; i < 4; i++){
            int a = x + dx[i], b = y + dy[i];
            if (a < 0 || a >= n || b < 0 || b >= n) continue;
            if (s[a][b] == 'T') continue;
            int cur = dis2[x][y];
            
            if ((cur + 1) / k < dis[a][b] - m && cur + 1 < dis2[a][b]){
                dis2[a][b] = cur + 1;
                que.push({a, b});
            }
        }
    }
    // REP(i, n){
    //     REP(j, n){
    //         cerr << dis2[i][j] << " ";
    //     }
    //     cerr << '\n';
    // }
    return dis2[des.fi][des.se] != 1e9;
};
  if (!check(0)){
    cout << -1;
    return;
  }
  int l = -1, r = 10000;
  while(r - l > 1){
    int mid = (l + r) / 2;
    if (check(mid)) l = mid;
    else r = mid;
  }
  cout << l;
}
 
int32_t main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int tests = 1;
  //cin >> tests;
  for (int _ = 1; _ <= tests; _++){
    cerr << "- Case #" << _ << ": \n";
    solve();
    el;
  }
  return 0;
}

Subtask #1
60.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 95 ms 6756 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 344 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Incorrect 0 ms 348 KB Output isn't correct
13 Incorrect 0 ms 348 KB Output isn't correct
14 Correct 0 ms 464 KB Output is correct
15 Correct 0 ms 344 KB Output is correct
16 Correct 0 ms 348 KB Output is correct
17 Correct 0 ms 348 KB Output is correct
18 Correct 0 ms 348 KB Output is correct
19 Correct 0 ms 348 KB Output is correct
20 Correct 1 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 1 ms 348 KB Output is correct
24 Correct 1 ms 348 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 1 ms 348 KB Output is correct
27 Correct 1 ms 472 KB Output is correct
28 Correct 0 ms 424 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 1 ms 348 KB Output is correct
31 Correct 1 ms 348 KB Output is correct
32 Correct 0 ms 464 KB Output is correct
33 Incorrect 4 ms 1700 KB Output isn't correct
34 Incorrect 4 ms 1684 KB Output isn't correct
35 Correct 19 ms 1748 KB Output is correct
36 Incorrect 6 ms 2080 KB Output isn't correct
37 Incorrect 5 ms 2112 KB Output isn't correct
38 Correct 26 ms 2096 KB Output is correct
39 Incorrect 7 ms 2488 KB Output isn't correct
40 Incorrect 6 ms 2528 KB Output isn't correct
41 Correct 34 ms 2504 KB Output is correct
42 Incorrect 8 ms 2980 KB Output isn't correct
43 Incorrect 7 ms 2956 KB Output isn't correct
44 Correct 43 ms 2980 KB Output is correct
45 Incorrect 10 ms 3512 KB Output isn't correct
46 Incorrect 9 ms 3516 KB Output isn't correct
47 Correct 52 ms 3484 KB Output is correct
48 Incorrect 11 ms 4136 KB Output isn't correct
49 Incorrect 11 ms 4132 KB Output isn't correct
50 Correct 65 ms 4104 KB Output is correct
51 Incorrect 14 ms 4684 KB Output isn't correct
52 Incorrect 13 ms 4692 KB Output isn't correct
53 Correct 75 ms 4692 KB Output is correct
54 Incorrect 15 ms 5408 KB Output isn't correct
55 Incorrect 15 ms 5356 KB Output isn't correct
56 Correct 89 ms 5364 KB Output is correct
57 Incorrect 17 ms 6068 KB Output isn't correct
58 Incorrect 16 ms 6060 KB Output isn't correct
59 Correct 103 ms 6044 KB Output is correct
60 Incorrect 21 ms 6792 KB Output isn't correct
61 Incorrect 18 ms 6740 KB Output isn't correct
62 Correct 128 ms 6772 KB Output is correct
63 Correct 114 ms 6920 KB Output is correct
64 Correct 190 ms 6716 KB Output is correct
65 Correct 143 ms 6744 KB Output is correct
66 Correct 116 ms 6708 KB Output is correct
67 Correct 27 ms 6492 KB Output is correct
68 Correct 48 ms 6748 KB Output is correct
69 Correct 49 ms 6780 KB Output is correct
70 Correct 46 ms 6756 KB Output is correct
71 Correct 40 ms 6736 KB Output is correct
72 Incorrect 29 ms 6776 KB Output isn't correct
73 Incorrect 45 ms 6788 KB Output isn't correct
74 Correct 66 ms 6768 KB Output is correct
75 Correct 80 ms 6748 KB Output is correct
76 Correct 64 ms 6740 KB Output is correct
77 Correct 65 ms 6772 KB Output is correct
78 Correct 23 ms 6748 KB Output is correct
79 Correct 56 ms 6764 KB Output is correct
80 Correct 62 ms 6892 KB Output is correct
81 Correct 70 ms 6772 KB Output is correct
82 Correct 67 ms 6768 KB Output is correct
83 Correct 83 ms 6768 KB Output is correct
84 Correct 80 ms 6760 KB Output is correct
85 Correct 83 ms 6776 KB Output is correct
86 Correct 79 ms 6776 KB Output is correct
87 Correct 81 ms 6848 KB Output is correct
88 Correct 100 ms 6712 KB Output is correct
89 Correct 101 ms 6768 KB Output is correct
90 Correct 102 ms 6768 KB Output is correct
91 Correct 95 ms 6748 KB Output is correct
92 Correct 104 ms 6748 KB Output is correct