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Submission #1094684

# Submission time Handle Problem Language Result Execution time Memory
1094684 2024-09-30T09:45:47 Z akamizane Mecho (IOI09_mecho) C++17
57 / 100
 172 ms 6276 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 = 2000;
  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
57.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 1 ms 344 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 97 ms 6236 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 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 348 KB Output is correct
15 Correct 0 ms 348 KB Output is correct
16 Correct 1 ms 344 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 0 ms 348 KB Output is correct
21 Correct 0 ms 348 KB Output is correct
22 Correct 0 ms 344 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 0 ms 348 KB Output is correct
25 Correct 1 ms 344 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Incorrect 0 ms 348 KB Output isn't correct
28 Correct 1 ms 348 KB Output is correct
29 Incorrect 0 ms 348 KB Output isn't correct
30 Correct 0 ms 348 KB Output is correct
31 Incorrect 0 ms 348 KB Output isn't correct
32 Correct 0 ms 348 KB Output is correct
33 Incorrect 3 ms 1572 KB Output isn't correct
34 Incorrect 4 ms 1576 KB Output isn't correct
35 Correct 20 ms 1580 KB Output is correct
36 Incorrect 4 ms 1880 KB Output isn't correct
37 Incorrect 4 ms 1884 KB Output isn't correct
38 Correct 25 ms 1880 KB Output is correct
39 Incorrect 5 ms 2292 KB Output isn't correct
40 Incorrect 5 ms 2288 KB Output isn't correct
41 Correct 35 ms 2308 KB Output is correct
42 Incorrect 8 ms 2744 KB Output isn't correct
43 Incorrect 7 ms 2700 KB Output isn't correct
44 Correct 43 ms 2736 KB Output is correct
45 Incorrect 8 ms 3196 KB Output isn't correct
46 Incorrect 8 ms 3164 KB Output isn't correct
47 Correct 52 ms 3196 KB Output is correct
48 Incorrect 9 ms 3736 KB Output isn't correct
49 Incorrect 10 ms 3716 KB Output isn't correct
50 Correct 66 ms 3700 KB Output is correct
51 Incorrect 12 ms 4184 KB Output isn't correct
52 Incorrect 10 ms 4288 KB Output isn't correct
53 Correct 73 ms 4276 KB Output is correct
54 Incorrect 13 ms 4896 KB Output isn't correct
55 Incorrect 13 ms 4884 KB Output isn't correct
56 Correct 92 ms 4896 KB Output is correct
57 Incorrect 14 ms 5544 KB Output isn't correct
58 Incorrect 15 ms 5528 KB Output isn't correct
59 Correct 99 ms 5504 KB Output is correct
60 Incorrect 16 ms 6236 KB Output isn't correct
61 Incorrect 15 ms 6260 KB Output isn't correct
62 Correct 112 ms 6232 KB Output is correct
63 Correct 103 ms 6188 KB Output is correct
64 Correct 172 ms 6220 KB Output is correct
65 Correct 154 ms 6232 KB Output is correct
66 Correct 131 ms 6236 KB Output is correct
67 Correct 26 ms 6236 KB Output is correct
68 Correct 46 ms 6244 KB Output is correct
69 Correct 46 ms 6264 KB Output is correct
70 Correct 42 ms 6244 KB Output is correct
71 Correct 35 ms 6232 KB Output is correct
72 Incorrect 33 ms 6228 KB Output isn't correct
73 Incorrect 39 ms 6276 KB Output isn't correct
74 Correct 71 ms 6240 KB Output is correct
75 Correct 72 ms 6232 KB Output is correct
76 Correct 65 ms 6248 KB Output is correct
77 Correct 68 ms 6232 KB Output is correct
78 Correct 25 ms 6232 KB Output is correct
79 Correct 68 ms 6244 KB Output is correct
80 Correct 65 ms 6256 KB Output is correct
81 Correct 73 ms 6260 KB Output is correct
82 Correct 68 ms 6240 KB Output is correct
83 Correct 85 ms 6236 KB Output is correct
84 Correct 98 ms 6264 KB Output is correct
85 Correct 76 ms 6248 KB Output is correct
86 Correct 83 ms 6228 KB Output is correct
87 Correct 82 ms 6232 KB Output is correct
88 Correct 87 ms 6252 KB Output is correct
89 Correct 102 ms 6216 KB Output is correct
90 Correct 94 ms 6236 KB Output is correct
91 Correct 93 ms 6236 KB Output is correct
92 Correct 90 ms 6248 KB Output is correct